ENTOMOLOGY AND PLANT PATHOLOGY DEPARTMENTAL SERIES NO. 4
MARCH 2002
ALABAMA AGRICULTURAL EXPERIMENT STATION
JOHN JENSEN, INTERIM DIRECTOR
AUBURN UNIVERSITY
AUBURN, ALABAMA
MANAGEMENT
OF DISEASES
ON COTTON
AND
SOYBEAN,
2000
Printed in cooperation with the Alabama Cooperative Extension System
(Alabama A&M University and Auburn University).

Table of Contents
Page
Editor, Contributors, A cknow ledgm ents ....................................................... .. .......... ......... .............. 2
Introduction ....................................................... ............................................................................. 3
Evaluation of Selected In-furrow Fungicides for Control of Cotton Seedling Disease
in N orth A labam a ................................................................. ................................... ............................. 4
Evaluation of Selected Seed Treatments for Control of Cotton Seedling Disease
on 'DPL NuCotn 35B' in North Alabama .................... ..... ................................. ..................... 7
Evaluation of Selected Seed Treatments for Control of Cotton Seedling Disease
on 'Suregrow 125 B/RR' in North Alabama......... ............... ................... ................................... 10
Evaluation of Selected In-furrow Fungicides for Control of Cotton Seedling Disease
on 'DPL NuCotn 35B' in Central Alabama ................................................... 12
Evaluation of Selected In-furrow Fungicides for Control of Cotton Seedling Disease
on 'Suregrow 125 B/RR' in Central Alabama............................ .. ............ .. .................... 14
Evaluation of Selected In-furrow Fungicides for Control of Cotton Seedling Disease
in Southeast A labam a ............................................................................................................................ 16
Evaluation of Selected Fungicides for Control of Seedling Disease
in Ultra Narrow Row Cotton ............................ .... ................................ ............ ...................... 18
Evaluation of Selected Fungicides for Control of Cotton Boll Rot Disease on Cotton ............................ 19
Evaluation of Quadris for Control of Cotton Boll Rot Disease on Cotton .................................................. 20
Cotton Variety Response to the Reniform Nematode .................................................................................. 21
Management of the Reniform Nematode with Anhydrous Ammonia ......................................................... 22
Evaluation of Selected Fungicides for Soybean Stem Canker Control ......................................................... 23
Evaluation of Quadris and Benlate for Soybean Foliar Disease Control....................................................... 24
Chemicals Used in the Soil-borne and Foliar Disease Studies ..................................................................... 25
Information contained herein is available to all persons regardless of race, color sex, or national origin.
Issued in furtherance of Cooperative Extension work in agriculture and home economics, Acts of May 8 and June
30, 1914, and other related acts, in cooperation with the U.S. Department ofAgriculture. The Alabama Coopera-
tive Extension System (Alabama A&M University and Auburn University) offers educational programs, materials,
and equal opportunity employment to all people without regard to race, color, national origin, religion, sex, age,
veteran status, or disability.
Editor
Kathy S. McLean
Assistant Professor
Department of Entomology and Plant Pathology
Auburn University
Contributors
James R. Akridge
Superintendent
Monroeville Experiment Field
Brewton Experiment Field
Lee Campbell
Lab Technician III
Department of Entomology and Plant Pathology
Auburn University
Linda Carter
Lab Technician III
Department of Entomology and Plant Pathology
Auburn University
Dennis Delaney
Extension Program Associate
Department of Agronomy and Soils
Auburn University
W. S. Gazaway
Professor Emeritus
Department of Entomology and Plant Pathology
Auburn University
Gary W. Lawrence
Professor
Department of Entomology and Plant Pathology
Mississippi State University
Charles D. Monks
Associate Professor & Extension Specialist
Department of Agronomy and Soils
Auburn University
Don P. Moore
Superintendent
Prattville Experiment Field
Bobby E. Norris
Superintendent
Tennessee Valley Research and Extension
Center
Aaron J. Palmateer
Graduate Research Assistant
Department of Entomology and Plant Pathology
Auburn University
Malcomb E. Pegues
Supervisor
Gulf Coast Research and Extension Center
Larry W. Wells
Superintendent
Wiregrass Research and Extension Center
Acknowledgments
The following agencies provided financial support for the 2000 cotton and soybean research
program:
Aventis Crop Protection, Research Triangle Park, NC
Novartis Crop Protection, Greensboro, NC
Uniroyal Chemical, Inc., Middlebury, CT
Zeneca Ag Products, Wilmington, DE
Wilbur-Ellis, Kansas City, KS
Management of Diseases
on Cotton and Soybean, 2000
Introduction
Soybeans and cotton are widely grown in Alabama and producers are constantly battling a variety of diseases.
This report summarizes the results of soil-borne and foliar disease trials on soybean and cotton conducted by
Alabama Agricultural Experiment Station (AAES) personnel in 2000. It provides management information for
producers, industry cooperators, colleagues at universities, and other interested persons.
The soil-borne and foliar disease trials were located on AAES research stations and in producer fields. Test
plots at the Tennessee Valley Research and Extension Center, Belle Mina, received adequate moisture, which was
supplemented by standard irrigation practices. The Prattville Experiment Field, Prattville, and the Gulf Coast
Research and Extension Center, Fairhope did not receive adequate moisture during the growing season.
Application Methods: Granular applications of Terraclor Super X 18.8G, Terraclor 15G, and Ridomil Gold PC 11G
were applied in the seed furrow utilizing a two-row cone planter equipped with granular chemical applicators.
Terraclor 2E, Terraclor 4F,Quadris 2SC, and Rovral 4F were applied as an in-furrow spray at planting utilizing a
flat tip 8002E nozzle directed at an angle across the furrow and calibrated to deliver 20 GPA at 30 PSI.
RTU BaytanThiram + Allegiance Delta Coat AD were applied to a known amount of seed in a Ziploc bag. The
bag was shaken until the seeds were completely covered, and the seeds were allowed to dry. All other seed
treatments were applied to the seed by the manufacturer.
Quadris 2SC, Benlate 50 WP, Tilt, Terraclor 4F, and Rovral 4F were applied as foliar sprays using TX-12 cone
nozzles mounted on ground slides spraying upward with two nozzles per row calibrated to deliver 26GPA at 75 PSI.
Data Collection: Plant population densities were determined from 14, 28, and 42 days after planting. A skip index
rating was taken at 28 to 42 days after planting using the following rating scale: 1 = 1.5 feet of gap between plants, 2
= 2.5 feet of gap, 3 = 3.5 feet of gap, and so on. Open bolls were counted approximately three weeks before harvest.
Percent of open bolls was based on the number of open bolls divided by the total number of bolls on five plants and
multiplied by 100 to determine early maturity. Yields were harvested using station equipment and reported as
pounds of seed cotton per acre.
Statistical Analysis: Data presented in this report were statistically analyzed using the Statistical Analysis System
(SAS Institute Inc., Cary, N.C.). Data were subjected to ANOVA appropriate for the experimental design used and
means were separated using the least significant difference test. All statistical tests were performed at the 5% level of
significance.
NOTE: Trade names are used throughout this report for clarity, except where they are unavailable. At the end of
this publication is a list of trade names, chemical names, and company sources when available of all chemicals used
in these trials. All fungicides are expressed as formulated rate per acre as suggested by the manufacturers.
The information presented in this report is neither an endorsement nor recommendation of the commercial products
used in these trials. It is intended for private use and may not be reproduced without permission.
4 ALABAMA AGRICULTURAL EXPERIMENT STATION
Evaluation of Selected In-furrow Fungicides for Control
of Cotton Seedling Disease in North Alabama
K.S. McLean, H.L. Campbell, A.J. Palmateer, and B.E. Norris
Objective: Evaluate selected in-furrow fungicide 
treatments for control of Rhizoctonia solani 
and Pythium spp.
seedling disease of cotton.
Location: Tennessee Valley Research and Extension Center, Belle Mina, Alabama
Cultivar: 'Sure-Grow 125 BR'
Planting:
Date: April 19, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Two-row plots, rows 25 feet long, 40 inches wide, blocks separated by 20-foot alley
Seeding Rate: 125 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: In-furrow fungicide sprays were applied at a rate of 20 GPA and granular applications
were applied with chemical granular applicators attached to the planter. Two rows of each plot were infested with
Pythium spp. and R. solani by applying inoculated millet seed in the furrow at planting (Tables 1 and 3).
Planting Assessment: Stand counts were made on May 2, May 17, and May 31, 2000.
Harvest: Plants were harvested on September 19, 2000.
Results:
Inoculated Study with Standard Fungicide Treatments (Table 1). Cotton seedling disease incidence was
moderate. Significant differences in seedling stand were observed at 2, 4, and 6 weeks after planting. At 2 weeks
after planting, Terraclor 4F and Ridomil Gold PC produced significantly greater stands than Rovral 4CF. By 4 weeks
after planting, Ridomil Gold PC, Terraclor 15G, Terraclor Super X 18.8G, Terraclor 4 F, and Terraclor 15 G all produced
greater stands than the control. By 6 weeks after planting, Ridomil Gold PC, Terraclor 15G, Terraclor Super X 18.8G,
Terraclor 4F, Terraclor 15 G, and Terraclor EC all produced greater stands than the control. These fungicides also
produced a significantly lower skip index indicating a more evenly spaced seedling stand than the control at 6
weeks after planting. Seed cotton yields varied over 588 pounds per acre for the Terraclor Super X 18.8 G and the
Rovral 4CF treatments, respectively. Terraclor Super X 18.8 G, Terraclor 4F, Ridomil Gold, Quadris, and Ridomil Gold
PC all produced significantly greater yields than the control. The average yield of seed cotton from the fungicide-
treated plots was 196 pounds per acre greater than the yield of the untreated control.
Uninoculated Study with Standard Fungicide Treatments (Table 2). Cotton seedling disease incidence and
severity was light to moderate. Significant differences in seedling stand were observed at 2, 4, and 6 weeks after
planting. At 2 weeks after planting, Quardis 2SC produced a significantly greater stand than the untreated control.
At 4 and 6 weeks seven and nine of the fungicides significantly improved yields compared to the untreated control.
However, no treatment produced a significantly lower skip index to indicate a more evenly spaced seedling stand
compared to the control at 6 weeks after planting. Seed cotton yields ranged from 3920.40 pounds per acre to
3444.70 pounds per acre for the Quadris 2 SC and the Ridomil Gold WSP treatments, respectively. The average yield
of seed cotton from the fungicide-treated plots was not greater than the yield of the untreated control.
Inoculated Study with Experimental Fungicides (Table 3). Cotton seedling disease incidence was moderate.
Significant differences in seedling stand were observed at 2, 4, and 6 weeks after planting. Ridomil G + CGA-279202
produced the greatest stand at 2 weeks after planting. At 4 and 6 weeks Ridomil Gold + Terraclor 4 F, Ridomil G +
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 5
PCNB, and Ridomil G + CGA-279202 produced significantly greater stands than the untreated control. At 6 weeks
after planting, Ridomil G + PCNB and Ridomil G + CGA-279202 also produced a significantly lower skip index
indicating a more evenly spaced seedling stand than the control. However, at 4 weeks after planting only Vitavax-
PCNB + Allegiance FL (6.0 + 0.75 fluid ounces per cwt) produced a significantly lower skip index. No significant
differences in the number of open bolls were observed on five plants per plot. Seed cotton yields varied 496 pounds
per acre for the Ridomil Gold + Terraclor 4 F and the untreated control, respectively. Ridomil Gold + Terraclor 4 F and
Ridomil G + PCNB significantly increased yields over the control. The average yield of seed cotton from the
fungicide-treated plots was 241.8 pounds per acre greater than the yield of the untreated control.
TABLE 1 (INOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND,
SKIP INDEX, AND YIELD IN NORTH ALABAMA
Skip Seed
Treatment and rate Application Stand'
-  
index 
2  
cotton lb/ac
May 2 May 17 May 31 May 31 Sept. 19
Untreated control - 24.67 55.17 53.17 14.83 3055.30
Terraclor Super X 18.8G 5.5 lb/ac In furrow 27.17 75.33 76.00 4.67 3523.10
Terraclor Super X EC 48 fl oz/ac In furrow 25.33 66.00 64.83 5.33 3193.80
Terraclor 2E 48 fl oz/ac In furrow 24.00 65.50 67.83 3.83 3112.80
Terraclor 15G 5 lb/ac In furrow 27.50 79.67 77.83 2.83 3180.80
Terraclor 4F 24 fl oz/ac In furrow 33.17 71.67 70.00 5.67 3473.50
Rovral 4CF 5.2 fl oz/ac In furrow 22.00 54.17 54.33 12.17 2992.50
Rovral 4CF 6 fl oz/ac In furrow 26.50 50.83 54.17 14.67 2935.10
Ridomil Gold 11 PC 7 lb/ac In furrow 33.17 83.33 81.16 2.67 3327.10
Quadris 2SC 5.56 fl oz/ac In furrow 26.33 57.00 52.50 13.67 3348.00
Delta Coat AD 11.75 fl oz/ac Seed 31.33 63.00 60.33 9.00 3314.04
Ridomil Gold 0.075 fl oz/1000 ft In furrow 29.33 62.17 50.83 12.50 3379.40
LSD (0.05) 9.49 9.52 8.03 4.92 311.00
'Number of live seedlings per 30 ft of row; all rows received 125 Sure-Grow 125 BR seed.
2 Skip index ratings on 30 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
TABLE 2 (UNINOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND,
SKIP INDEX, AND YIELD IN NORTH ALABAMA
Skip Seed
Treatment and rate Application Stand' index
2  
cotton lb/ac
May 2 May 17 May 31 May 31 Sept. 19
Untreated control - 43.17 78.17 83.67 4.33 3855.10
Terraclor Super X 18.8G 5.5 lb/ac In furrow 49.50 79.17 84.33 5.00 3546.60
Terraclor Super X EC 48 fl oz/ac In furrow 44.17 77.33 86.17 4.67 3666.90
Terraclor 2E 48 fl oz/ac In furrow 36.67 76.50 92.33 3.67 3693.00
Terraclor 15G 5 lb/ac In furrow 42.67 83.50 93.00 4.00 3606.80
Terraclor 4F 24 fl oz/ac In furrow 49.17 88.00 92.50 5.00 3468.00
Rovral 4CF 5.2 fl oz/ac In furrow 45.83 83.50 94.00 3.67 3870.70
Rovral 4CF 6 fi oz/ac In furrow 48.67 82.33 91.00 5.00 3546.60
Ridomil Gold PC 7 lb/ac In furrow 41.67 81.83 88.50 4.00 3444.70
Quadris 2SC 5.56 fi oz/ac In furrow 59.00 90.33 100.33 3.00 3920.40
Delta Coat AD 11.75 oz/cwt Seed 39.00 70.00 74.83 5.33 3483.90
Ridomil Gold BC 0.075 fi oz/1000 ft In furrow 45.33 84.50 99.67 3.50 3724.40
LSD (0.05) 15.63 10.59 9.62 2.84 274.40
'Number of live seedlings per 30 ft of row; all rows received 125 Sure-Grow 125 BR seed.
2 Skpindex ratings on 30 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
6 ALABAMA AGRICULTURAL EXPERIMENT STATION
TABLE 3 (INOCULATED STUDY). EFFECT OF EXPERIMENTAL FUNGICIDE COMBINATIONS
ON COTTON STAND, SKIP INDEX, AND YIELD IN NORTH ALABAMA
Skip Seed
Treatment and rate Application Stand'- index
2  
cotton lb/ac
May 2 May 17 May 31 May 31 Sept. 19
Untreated control - 29.2 51.7 49.5 7.2 3084.0
Terraclor Super X 1.85 oz ai/1000 ft row In furrow 32.8 63.2 60.3 6.1 3397.7
Quadris 2SC 8.35 fl oz/ac In furrow 29.8 59.5 56.2 5.8 3136.3
Quadris2SC 5.56 fl oz/ac In furrow 28.2 57.2 53.0 6.4 3214.7
Ridomil Gold + Terraclor In furrow 29.3 69.2 66.2 4.8 3580.6
1.0 + 7.4 fl oz/1000 ft row
Ridomil Gold EC 1.0 fl oz/1000 ft row In furrow 31.2 65.2 58.7 6.0 3267.0
Delta Coat AD 11.75 oz/cwt In furrow 31.3 68.5 66.0 3.4 3397.7
Ridomil G + PCNB 0.040 lb ai/ac + In furrow 36.3 77.7 75.3 2.3 3554.5
1.0 lb ai/ac
Ridomil G + CGA-279202 In furrow 31.0 59.7 59.2 4.5 3319.3
0.040 lb ai/ac + 0.125 lb ai/ac
Ridomil G + CGA-279202 In furrow 38.0 68.7 66.8 3.3 3371.5
0.040 lb ai/ac + 0.156 lb ai/ac
Ridomil G + Rovral 0.040 lb ai/ac + In furrow 23.2 56.0 53.2 7.6 3110.2
0.156 lb ai/ac
LSD (0.05) 9.6 12.6 11.8 2.9 381.6
'Number of live seedlings per 30 ft of row; all rows received 125 Sure-Grow 125 BR seed.
2 Skip index ratings on 30 ft of row. Rating scale: 1 = 1 ft gap; 2 
= 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 7
Evaluation of Selected Seed Treatments for Control
of Cotton Seedling Disease on 'DPL NuCotn 35B'
in North Alabama
K.S. McLean, H.L. Campbell, A.J. Palmateer, and B.E. Norris
Objective: Evaluate selected seed treatments for control of Pythium spp. and Rhizoctonia solani seedling disease
of cotton.
Location: Tennessee Valley Research and Extension Center, Belle Mina, Alabama
Cultivar: 'DPL NuCotn 33B'
Planting:
Date: April 19, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Two-row plots, rows 25 feet long, 40 inches wide, blocks separated by 20-foot alley
Seeding Rate: 125 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: All fungicides were applied to the seed as seed treatments before planting by the
manufacturer. Two rows of each plot were infested with Pythium spp. and R. solani by applying inoculated millet
seed in the furrow at planting (Table 1 and 3).
Planting Assessment: Stand counts were made on May 2, May 17, and May 31, 2000.
Harvest: Plants were harvested on September 19, 2000.
Results:
Inoculated Study with Standard Seed Treatments (Table 1) Cotton seedling disease incidence and severity was
moderate in the 2000 season. Significant differences in seedling stand were observed at 2, 4, and 6 weeks after planting.
The Apron XL + Maxim + Dividend treatment consistently produced greater stands than the untreated control at all three
sample dates. At 6 weeks after planting, Apron XL + Systhane 40 WSP + Maxim, Apron XL + Maxim+ Systhane 40
WSP, Apron XL + Maxim+ Azoxystrobin, and Apron XL+ Maxim + Dividend all produced significantly greater yields
than the untreated control. All fungicide seed treatments produced a significantly lower skip index indicating a more
evenly spaced seedling stand than the control at 6 weeks after planting. No significant differences were observed in the
number of open bolls on five plants per plot. Seed cotton yields varied 261 pounds per acre for the Apron XL + Maxim +
Azoxystrobin, and the untreated control, respectively. The average yield of seed cotton from the fungicide-treated plots
was 144.5 pounds per acre greater than the yield of the untreated control.
Uninoculated Study with Standard Seed Treatments (Table 2). Cotton seedling disease incidence was light.
Significant differences in seedling stand were observed only at 6 weeks after planting. At 2 and 4 weeks after planting,
none of the fungicide seed treatments produced a significantly greater stand than the untreated control. At 6 weeks after
planting differences in stand were observed between seed treatments but none were different from the control. No
significant differences in stand uniformity or number of open bolls were observed. Seed cotton yields varied 340 pounds
per acre for the Apron XL + Maxim+ Dividend and the CGA-48988 + Maxim+ Systhane 40 WSP treatments, respectively.
Six of the seed treatments produced numerically greater yields than the control. The average yield of seed cotton from the
fungicide-treated plots was 102 pounds per acre greater than the yield of the untreated control.
Inoculated Study with Experimental Seed Treatments (Table 3). Cotton seedling disease pressure was moder-
ate to light. Significant differences in seedling stand were observed only at 4 weeks after planting. At 4 weeks
after planting, Delta Coat Ad + Nu-Flow M + PGE 143 + PGE 146 and Apron TL + Nu-Flow T + Nu-Flow M pro-
duced significantly greater stands than the Apron TL + Nu-Flow T + Nu-Flow M + PGE 143 + PGE 146 seed treat-
ment. No seed treatment produced a significantly lower skip index indicating a more evenly spaced seedling stand
than the control at 6 weeks after planting. No significant differences were observed in the number of open bolls on five
plants per plot. Seed cotton yields varied 310 pounds per acre in the Apron TL + Nu-Flow T + Nu-Flow M + PGE 143 +
PGE 144 and the Apron TL + Nu-Flow T + Nu-Flow M + PGE 143 + PGE 146 seed treatments, respectively. The average
yield of seed cotton from the fungicide-treated plots was not greater than the yield of the untreated control.
Uninoculated Study with Experimental Seed Treatments (Table 4) Cotton seedling disease incidence was
moderate. Significant differences in seedling stand were observed at 2, 4, and 6 weeks after planting. At 2 weeks
after planting, Apron TL + Nu-Flow T + Nu-Flow M + PGE 143 + PGE 144 produced significantly greater stands than
the untreated control. However, by 4 and 6 weeks after planting Delta Coat AD + Nu-Flow M + PGE 143 + PGE 146
produced greater stands than Delta Coat AD + Nu-Flow M and Delta Coat + AD + Nu-Flow M+ PGE 144. No seed
treatment produced a significantly lower skip index to indicate a more evenly spaced seedling stand than in the
control at 6 weeks after planting. No significant differences were observed in the number of open bolls on five
plants per plot. Seed cotton yields varied 209 pounds per acre for the Apron TL + Nu-Flow T + Nu-Flow M seed
treatment and the Apron TL + Nu-Flow T + Nu-Flow M + PGE 143 + PGE 144 seed treatment, respectively. The
average yield of seed cotton from the fungicide-treated plots was not greater than the yield of the untreated control.
TABLE 1 (INOCULATED STUDY). EFFECT OF SELECTED SEED TREATMENTS
ON COTTON STAND, SKIP INDEX, AND YIELD IN NORTH ALABAMA
Skip Seed
Treatment Rate' Application Stand
2  
index cotton lb/ac
May2 May17 May31 May31 Sept. 19
Untreated control - - 48.2 66.0 65.3 7.5 3136.3
CGA-48988 + Bayatan 30 + Thiram 42S 15+ 10 + 31 Seed 55.5 90.8 91.0 2.0 3293.1
Apron XL + Maxim + Systhane 40 WSP 7.5'+ 2.5 + 20 Seed 59.3 92.0 89.8 2.3 3319.3
Apron + Systhane 40 WSP + Maxim 7.5 + 25 + 2.5 Seed 55.3 91.7 94.3 1.7 3188.6
Apron XL + Maxim + Systhane 40 WSP 7.5 + 2.5 + 30 Seed 55.3 89.2 94.8 1.2 3293.1
Apron XL + Maxim + Azoxystrobin 7.5 + 2.5 + 15 Seed 56.3 89.3 93.2 1.2 3397.7
Apron XL + Maxim + Azoxystrobin 7.5 + 2.5 + 20 Seed 52.8 90.3 90.2 2.2 3293.1
Apron XL + Maxim + Azoxystrobin 7.5 + 2.5 + 25 Seed 48.3 82.3 88.7 2.5 3214.7
Apron XL + Maxim + Dividend 7.5 + 2.5 + 25 Seed 46.7 90.7 87.8 1.3 3267.0
Apron XL + Maxim + Dividend 7.5 + 2.5 + 30 Seed 58.3 93.5 92.8 1.5 3293.1
Apron XL + Maxim 7.5 + 2.5 Seed 43.3 85.8 83.2 1.5 3319.3
LSD (0.05) 14.4 9.8 9.4 2.8 378.9
'Rate = gallons active ingredient per 100 kg seed. 2 Number of live seedlings per 25 ft of row; all rows received 125 seed of 'DPL
NuCotn 33B'. 
3
Skip index ratings on 25 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
TABLE 2 (UNINOCULATED STUDY). EFFECT OF SELECTED SEED TREATMENTS
ON COTTON STAND, SKIP INDEX, AND YIELD IN NORTH ALABAMA
Skip Seed
Treatment Rate' Application Stand
2  
index 
3
cotton lb/ac
May 2 May 17 May 31 May 31 Sept. 19
Untreated control - - 75.8 93.2 104.5 0.3 3319.2
CGA-48988 + Bayatan 30 + Thiram 42S 15 + 10 + 31 Seed 67.2 99.3 107.5 0.0 3214.7
Apron XL + Maxim + Systhane 40 WSP 7.5 + 2.5 + 20 Seed 66.3 97.5 105.7 0.2 3449.9
Apron XL + Systhane 40 WSP + Maxim 7.5 + 25 + 2.5 Seed 70.2 99.7 114.5 0.3 3423.8
Apron XL + Maxim + Systhane 40 WSP 7.5 + 2.5 + 30 Seed 59.7 95.7 105.3 0.7 3319.3
Apron XL + Maxim + Azoxystrobin 7.5 + 2.5 + 15 Seed 62.2 92.5 101.5 0.0 3476.1
Apron XL + Maxim + Azoxystrobin 7.5 + 2.5 + 20 Seed 66.2 96.2 107.8 0.0 3345.4
Apron XL + Maxim + Azoxystrobin 7.5 + 2.5+ 25 Seed 69.8 92.0 99.7 0.2 3293.1
Apron XL + Maxim + Dividend 7.5 + 2.5 + 25 Seed 65.8 97.0 105.5 0.3 3293.1
Apron XL + Maxim + Dividend 7.5 + 2.5 + 30 Seed 63.0 91.0 102.5 0.3 3554.5
Apron XL + Maxim 7.5 + 2.5 Seed 70.5 93.5 106.8 0.5 3423.8
LSD (0.05) 19.3 11.7 11.5 0.8 457.4
'Rate = gallons active ingredient per 100 kg seed. 2 Number of live seedlings per 25 ft of row; all rows received 125 seed of 'DPL
NuCotn 33B' 3 Skip index ratings on 25 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
8 ALABAMA AGRICULTURAL EXPERIMENT STATION
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 9
TABLE 3 (INOCULATED STUDY). EFFECT OF EXPERIMENTAL SEED TREATMENTS
ON COTTON STAND, SKIP INDEX, AND YIELD IN NORTH ALABAMA
Skip Seed
Treatment Rate' Application Stand
2  
- index 
3
cotton lb/ac
May2 May1l7May31 May31 Sept. 19
Untreated control - - 43.7 80.3 77.8 2.5 3789.7
RTU Baytan-Thiram + Apron FL 3.0+ 0.75 Seed 45.3 83.7 80.7 2.3 3659.0
Delta Coat AD + NU-Flow M 11.75 + 1.25 Seed 40.7 87.7 85.8 0.7 3737.5
Delta Coat AD + Nu-Flow M + 11.75 + 1.25 + Seed 46.3 83.3 79.5 1.8 3580.6
PGE 143 + PGE 144 0.035 + 0.035
Delta Coat AD + Nu-Flow M + 11.75 + 1.25 + Seed 39.3 90.3 84.0 1.7 3737.5
PGE 143 + PGE 146 0.035 + 0.035
Apron TL + Nu-Flow T + Nu-Flow M 2.0 + 2.25 + 1.25 Seed 44.3 90.0 85.2 1.5 3580.6
Apron TL + Nu-Flow T + Nu-Flow M + 2.0 + 2.25 + 1.25 + Seed 43.0 83.3 80.3 107 3836.1
PGE 143 + PGE 144 0.035 + 0.035
Apron TL + Nu-Flow T + Nu-Flow M + 2.0 + 2.25 + 1.25 + Seed 37.3 79.2 76.8 2.8 3526.4
PGE 143 + PGE 146 0.035 + 0.035
LSD (0.05). 15.0 10.3 9.3 2.25 224.77
'Rate = gallons active ingredient per 100 kg seed.
2 Number of live seedlings per 
25 ft of row; all rows received 
125 seed of 'DPL NuCotn 33B'.
3 Skip index ratings on 25 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
TABLE 4 (UNINOCULATED STUDY). EFFECT OF EXPERIMENTAL SEED TREATMENTS
ON COTTON STAND, SKIP INDEX, AND YIELD IN NORTH ALABAMA
Skip Seed
Treatment Rate' Application Stand
2  
index 
3
cotton lb/ac
May 2 May 17 May 31 May31 Sept. 19
Untreated control - - 57.3 93.5 94.8 0.6 3580.6
RTU Baytan-Thiram + Apron FL 3.0+ 0.75 Seed 59.8 97.8 99.7 0.3 3554.5
Delta Coat AD + NU-Flow M 11.75+ 1.25 Seed 53.3 91.2 91.8 0.7 3476.1
Delta Coat AD+ Nu-Flow M + 11.75+1.25+ Seed 51.0 88.7 92.0 0.2 3528.4
PGE 143 +PGE 144 0.035+ 0.035
Delta Coat AD+ Nu-Flow M + 11.75+1.25+ Seed 58.8 99.8 102.2 0.3 3423.8
PGE 143 +PGE 146 0.035+0.035
Apron TL + Nu-Flow T + Nu-Flow M 2.0+2.25+125 Seed 60.5 94.7 96.5 0.3 3632.9
Apron TL + Nu-Flow T + Nu-Flow M + 2.0+2.25+1.25+ Seed 71.7 97.2 97.7 0.0 3423.8
PGE 143+PGE 144 0.035+0.035
Apron TL + Nu-Flow T + Nu-Flow M + 2.0+2.25+1.25 + Seed 60.3 93.3 93.3 0.3 3502.2
PGE 143 +PGE 146 0.035+0.035
LSD (0.05) 13.9 10.4 10.90 0.71 3476.10
' Rate = gallons active ingredient per 100 kg seed.
2 Number of live seedlings per 25 ft of row; all rows received 125 seed of 'DPL NuCotn 33B'.
Skip index ratings on 25 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
Evaluation of Selected Seed Treatments for Control
of Cotton Seedling Disease on 'Suregrow 
125 B/RR'
in North Alabama
K.S. McLean, H.L. Campbell, A.J. Palmateer, and B.E. Norris
Objective: Evaluate selected seed treatments as an in-furrow fungicide spray for control of seedling disease of
cotton caused by Pythium spp. and Rhizoctonia solani.
Location: Tennessee Valley Research and Extension Center, Belle Mina, Alabama
Cultivar: 'Suregrow 125 B/RR'
Planting:
Date: April 20, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Two-row plots, rows 25 feet long, 40 inches wide, blocks separated by 20-foot alley
Seeding Rate: 125 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: All fimungicides were applied as an in-furrow spray at planting. All in-furrow sprays were
applied with flat tip nozzles (8002E) calibrated to deliver 20 GPA at 30 PSI.
Planting Assessment: Stand counts were made on May 2, May 17, and May 31, 2000.
Harvest: Plants were harvested on September 19, 2000.
Results: Seedling disease incidence and severity were moderate. Significant differences in seedling stand were
observed at 4 and 6 weeks after planting. At 4 weeks after planting, the stand in the Ridomil G + CGA-279202 (0.04
+ 0.125 pound active ingredient per acre) treatment was significantly greater than the stand in the Delta Coat AD
and Quadris 2SC at the high rate. By 6 weeks after planting, Ridomil G + Rovral 4F, Ridomil G + PCNB, and Ridomil
Gold + Terraclor 4 F produced better stands than Delta Coat AD. However, there were no significant differences in
the skip index. No significant differences were observed among the treatments in the number of open bolls on five
plants per plot. Seed cotton yields varied 392 pounds per acre for the Ridomil G + CGA-279202 (0.04 + 0.156 pound
active ingredient per acre) and the Delta Coat AD treatments, respectively. The average yield of seed cotton from the
fungicide-treated plots was not greater than the yield of the untreated control.
10 ALABAMA AGRICULTURAL EXPERIMENT STATION
EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND, SKIP INDEX, AND YIELD
IN NORTH ALABAMA
Skip Seed
Treatment and rate Application Stand' index
2  
cotton lb/ac
May 2 May 17 May 31 May 31 Sept. 19
Untreated control - 57.5 98.9 101.0 0.2 3894.3
Terraclor Super X 1.85 oz ai/1000 ft row In furrow 56.2 99.0 104.5 0.5 3868.2
Quadris 2SC 8.35 fl oz/ac In furrow 65.0 92.5 102.2 0.3 3815.9
Quadris 2SC 5.56 fl oz/ac In furrow 58.8 93.8 100.7 0.2 3711.3
Ridomil Gold + Terraclor 4F In furrow 58.3 104.2 108.3 0.5 4024.9
1.0 + 7.4 fl oz/ 000f row
Ridomil Gold 1.0 fl oz/1000 ft row In furrow 59.2 98.8 102.0 0.3 3711.3
Delta Coat AD 11.75 oz/cwt In furrow 55.2 88.8 94.0 0.0 3685.2
Ridomil G + PCNB 0.040 lb ai/ac + In furrow 60.0 105.5 110.3 0.3 3868.2
1.0 lb ai/ac
Ridomil G + CGA-279202 0.040 lb ai/ac + In furrow 65.8 106.3 106.5 0.0 3868.2
0.125 lb ai/ac
Ridomil G + CGA-279202 0.040 lb ai/ac + In furrow 58.3 97.0 104.0 0.2 4077.2
0.156 lb 
ai/ac
Ridomil G + Rovral 4F 0.040 lb ai/ac + In furrow 57.8 98.8 108.2 0.3 3868.2
0.156 lb ai/ac
LSD (0.05) 15.6 12.2 12.9 0.6 279.0
'Number of live seedlings per 30 ft of row; all rows received 150 Sure-Grow 125 BR seed.
2 Skip index ratings on 30 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 
ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 11
Evaluation of Selected In-furrow Fungicides for Control
of Cotton Seedling Disease on 'DPL NuCotn 35B'
in Central Alabama
K.S. McLean, H.L. Campbell, A.J. Palmateer, and D. Moore
Objective: Evaluate in-furrow fungicide sprays for control of seedling disease of cotton caused by 
Pythium spp.
and Rhizoctonia solani.
Location: Prattville Experiment Field, Prattville, Alabama
Cultivar: 'DPL NuCotn 35B'
Planting:
Date: April 12,2000
Experimental Design: Randomized complete block with six replications
Plot Design: Two- row plots, rows 30 feet long, 36 inches wide, blocks separated by 20-foot alley
Seeding Rate: 150 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: All fungicides were either applied as an in-furrow spray at planting or granular applica-
tion at planting. All in-furrow sprays were applied as a broadcast spray with flat tip nozzles (8002E) calibrated to
deliver 20 GPA at 30 PSI. Granular treatments were applied with chemical boxes attached to the planter. Two rows of
each plot were infested with millet seed inoculated with Pythium spp. and R. soloni (Table 1).
Planting Assessment: Stand counts were made on April 25, May 10, and May 24, 2000.
Harvest: Plants were harvested on August 30, 2000.
Results:
Inoculated study (Table 1). Cotton seedling disease incidence and severity was moderate and a severe drought
reduced yields. Significant differences in seedling stand were observed at 4 and 6 weeks after planting. At 4 weeks
after planting, Terraclor Super X 2EC and Quadris 2SC treatments significantly increased stand counts compared to
the untreated control. At 6 weeks after planting, eight of the ten fungicide treatments significantly improved stand
density compared to the untreated control. However, no treatment produced a significantly lower skip index
indicating a more evenly spaced seedling stand compared to the control at 6 weeks after planting. Seed cotton
yields varied 274 pounds per acre in the Delta Coat AD and the Ridomil Gold + PCNB treatments, respectively. The
average yield of seed cotton from the ten fungicide-treated plots was 15 pounds per acre greater than the yield of the
untreated control.
Uninoculated study (Table 2). Cotton seedling disease incidence was moderate and a severe drought reduced
yields. Significant differences in seedling stand were observed at 4 and 6 weeks after planting. At 4 weeks 
after
planting, eight of the fungicide treatments had stands significantly greater than the stands recorded for the 
un-
treated control. However, no treatment significantly lowered the skip index compared to the control indicating 
a
more evenly spaced seedling stand at 6 weeks after planting. Seed cotton yields varied 166 pounds per 
acre in the
Quadris 2SC 8.35 fluid ounces per acre and the Ridomil Gold + CGA 0.156 pound active ingredient per acre treat-
ments, respectively. The average yield of seed cotton from the ten fungicide-treated plots was not greater than the 
yield
of the untreated control.
12
ALABAMA AGRICULTURAL EXPERIMENT STATION
TABLE 1 (INOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND,
SKIP INDEX, AND YIELD IN CENTRAL ALABAMA
Skip Seed
Treatment and rate Application - Seedling stand
1  
index
2 
cotton lb/ac
April 25 May 10 May 24 May 24 Aug. 31
Untreated control - 72.33 67.83 67.33 7.5 1427.80
Terraclor Super X EC 1.85 oz ai/1000 ft In furrow 81.17 86.33 86.5 3.33 1439.90
Quadris 2SC 8.35 fl oz/ac In furrow 83.00 80.50 87.00 3.50 1492.34
Quadris 2SC 5.56 fl oz/ac In furrow 81.00 80.67 80.67 5.50 1391.50
Ridomil Gold 0.075 fl oz/1000 ft row In furrow 79.00 76.33 77.17 5.67 1476.20
+Terraclor 2E 7.4 fl oz/1 000 ft row
Ridomil Gold 0.075 fl oz/1000 ft In furrow 77.17 74.50 75.50 6.33 1411.67
Delta Coat AD 11.75 oz/cwt Seed 80.67 78.5 80.17 3.5 1568.20
Ridomil Gold .040 lb ai/ac + PCNB 1.0 lb ai/ac In furrow 73.67 72.00 73.00 5.17 1488.30
Ridomil Gold 0.040 lb ai/ac + CGA-279202 0.125 lb ai/ac In furrow 71.67 65.67 56.83 9.33 1532.59
Ridomil Gold 0.040 lb ai/ac + CGA-279202 0.156 lb ai/ac In furrow 76.83 71.83 72.33 8.00 1294.70
Ridomil Gold 0.04 + Rovral 0.156 lb ai /ac In furrow 73.67 68.67 68.5 7.17 1335.04
LSD (0.05) 14.81 13.89 12.34 4.26 213.10
'Number of live seedlings per 30 ft of row; all rows received 150 DPL NuCotn 35B seed.
2 Skip index ratings on 30 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
TABLE 2 (UNINOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND,
SKIP INDEX, AND YIELD IN CENTRAL ALABAMA
Treatment and rate
Skip Seed
Application Seedling stand' index 
2
cotton lb/ac
April 25 May 10 May 24 May 24 Aug. 31
Untreated control - 110.5 90.67 96.00 2.83 1629.45
Terraclor Super X EC 1.85 oz ai/1000 ft In furrow 117.67 105.50 106.83 1.50 1543.90
Quadris 2SC 8.35 fl oz/ac In furrow 107.67 92.17 99.67 2.67 1661.70
Quadris 2SC 5.56 fl oz/ac In furrow 111.50 96.00 95.50 2.00 1548.80
Ridomil Gold 1.0 fl oz/1000 ft row In furrow 112.64 100.33 94.83 2.33 1568.20
+Terraclor 2E 7.4 fl oz/1000 ft row
Ridomil Gold 1.0 fl oz/1000 ft In furrow 114.83 95.17 96.33 2.00 1556.10
Delta Coat AD 11.75 oz/cwt Seed 106.33 95.17 93.00 2.67 1573.00
Ridomil Gold .040 lb ai/ac +PCNB 1.0 lb ai/ac In furrow 117.33 97.5 100.33 2.33 1573.00
Ridomil Gold 0.040 lb ai/ac + CGA-279202 0.125 lb ai/ac In furrow 104.50 93.83 99.67 2.00 1585.10
Ridomil Gold 0.040 lb ai/ac +CGA-279202 0.156 lb ai/ac In furrow 109.17 95.17 92.33 2.33 1495.60
Ridomil Gold 0.040 lb ai/ac +Rovral 0.156 lb ai/ac In furrow 113.67 91.00 93.5 2.67 1625.44
LSD (0.05) 19.97 12.70 12.47 1.53 196.00
'Number of live seedlings per 30 ft of row; all rows received 150 DPL NuCotn 35B seed.
2 Skip index ratings on 30 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 
3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 13
Evaluation of Selected In-furrow Fungicides for Control
of Cotton Seedling Disease on 'Sure-Grow 125 BR'
in Central Alabama
K.S. McLean, H.L. Campbell, A.J. Palmateer, and D. Moore
Objective: Evaluate in-furrow fungicide sprays for control of seedling disease of cotton caused by Pythium spp.
and Rhizoctonia solani.
Location: Prattville Experiment Field, Prattville, Alabama
Cultivar: 'Sure-Grow 125 BR'
Planting:
Date: April 12,2000
Experimental Design: Randomized complete block with six replications
Plot Design: Two- row plots, rows 30 feet long, 36 inches wide, blocks separated by 20-foot alley
Seeding Rate: 150 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: All fungicides were either applied as an in-furrow spray at planting or granular applica-
tion at planting. All in-furrow sprays were applied as a broadcast spray with flat tip nozzles (8002E) calibrated to
deliver 20 GPA at 30 PSI. Granular treatments were applied with chemical boxes attached to the planter. Two rows of
each plot were infested with millet seed inoculated with Pythium spp. and R. soloni (Table 1).
Planting Assessment: Stand counts were made on April 25, May 10, and May 24, 2000.
Harvest: Plants were harvested on August 30, 2000.
Results:
Inoculated study (Table 1). Cotton seedling disease incidence and severity were moderate and a severe drought
affected yields. Significant differences in seedling stand were observed at 2 and 4 weeks after planting. At 2 weeks
after planting, stand counts were significantly higher where Quardis 2SC,Terraclor 4F, Rovral 4CF, and Delta Coat
AD treatments were applied in-furrow. At 4 and 6 weeks after planting, Quadris 2SC, Rovral 4CF, Terraclor 4F,
Terraclor 2E, Terraclor Super X 2EC, Ridomil PC 11G, and Delta Coat AD treatments significantly improved stand
counts compared to the untreated control. These treatments produced a significantly lower skip index indicating a
more evenly spaced seedling stand compared to the control at 6 weeks after planting. Seed cotton yields varied 242
pounds per acre in the Delta Coat AD and the Rovral 4CF 6 fluid ounces per acre treatments, respectively. The
average yield of seed cotton from the eleven fungicide-treated plots was not greater than the yield of the untreated
control.
Uninoculated study (Table 2). Cotton seedling disease incidence and severity were light and a severe drought
affected yields. Significant differences in seedling stand counts were not observed among the treatments at 2, 4, or
6 weeks after planting. At 6 weeks after planting, stands ranged from 2.7 to 2.46 plants per foot of row with the
control measuring 2.57 plants. Rovral 4CF and Ridomil Gold PC 11G produced a significantly lower skip index
indicating a more evenly spaced seedling stand compared to the control at 6 weeks after planting. Seed cotton
yields varied 194 pounds per acre in the Rovral 4CF 6 fluid ounces per acre and the Terraclor Super X EC treatments,
respectively. The average yield of seed cotton from the eleven fungicide-treated plots was not greater than the yield of
the untreated control.
14 ALABAMA AGRICULTURAL EXPERIMENT STATION
TABLE 1 (INOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND,
SKIP INDEX, AND YIELD IN CENTRAL ALABAMA
Skip Seed
Treatment and rate Application - Cotton stand' index 
2  
cotton lb/ac
April 25 May 10 May 24 May 24 Aug. 30
Untreated control - 54.50 45.67 46.83 20.67 1403.60
TSX 18.8G 5.5 lb/ac In furrow 56.50 53.00 53.5 16.00 1294.70
TSX EC 48 fl oz/ac In furrow 59.17 58.83 63.00 11.67 1398.80
Terraclor 2E 48 fl oz/ac In furrow 63.17 57.00 58.17 13.00 1306.80
Terraclor 15G5 lb/ac In furrow 59.00 55.50 53.33 16.67 1258.40
Terraclor 4F 24 fl oz/ac In furrow 68.67 66.83 67.00 10.33 1374.60
Rovral 4CF 5.2 fl oz/ac In furrow 67.50 62.33 64.83 11.00 1202.70
Rovral 4CF 6 fl oz/ac In furrow 63.00 58.83 60.00 12.00 1314.10
Ridomil Gold PC 11G 7 lb/ac In furrow 61.17 57.5 58.83 14.67 1234.20
Quadris 2SC 5.56 fl oz/ac In furrow 75.67 73.17 71.67 7.33 1379.40
Delta Coat AD 11.75 fl oz/cwt Seed 66.17 63.67 63.50 9.33 1444.70
Ridomil Gold 4EC 1.0 fl oz/1000 ft In furrow 53.33 48.83 48.67 19.33 1299.50
LSD (0.05) 11.56 11.39 10.20 7.71 169.40
'Number of live seedlings per 30 ft of row; all rows received 150 Sure-Grow 125 BR seed.
2 Skip index ratings on 30 ft of row. 
Rating scale: 1 = I ft gap; 2 = 
2 ft gap; 3 = 3ft gap;... 25 =no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
TABLE 2 (UNINOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND,
SKIP INDEX, AND YIELD IN CENTRAL ALABAMA
Skip Seed
Treatment and rate Application Cotton stand index
2  
cotton lb/ac
April 25 May 10 May 24 May 24 Aug. 30
Untreated control - 93.17 78.50 67.33 5.67 1597.20
TSX 18.8G 5.5 lb/ac In furrow 85.00 74.50 73.83 3.33 1568.20
TSX EC 48 fl oz/ac In furrow 88.83 84.50 80.33 3.33 1408.40
Terraclor 2E 48 fl oz/ac In furrow 91.50 85.83 74.17 3.33 1420.50
Terraclor 15G 5 lb/ac In furrow 86.17 74.50 73.83 5.00 1524.60
Terraclor 4F 24 fl oz/ac In furrow 90.00 75.83 79.83 4.67 1524.60
Rovral 4CF 5.2 fl oz/ac In furrow 85.50 82.50 77.67 4.00 1410.90
Rovral 4CF 6 fl oz/ac In furrow 82.83 78.00 81.00 2.67 1602.00
Ridomil PC 11G 7 lb/ac In furrow 87.50 74.67 80.83 2.67 1435.10
Quadris 2SC 5.56 fl oz/ac In furrow 95.00 85.17 79.17 3.67 1556.10
Delta Coat AD 11.75 fl oz/cwt Seed 89.00 75.33 74.33 3.33 1517.30
Ridomil Gold 4EC 1.0 fl oz/1000 ft In furrow 85.17 73.50 74.50 5.33 1519.80
LSD (0.05) 14.89 14.83 13.27 2.69 166.90
'Number of live seedlings per 30 ft of row; all rows received 150 Sure-Grow 125 BR seed.
2 Skip index ratings on 30 ft of row. Rating scale: 1 = 1 
ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 15
Evaluation of Selected In-furrow Fungicides for Control
of Cotton Seedling Disease in Southeast Alabama
K.S. McLean, H.L. Campbell, A.J. Palmateer, and L. W. Wells
Objective: Evaluate in-furrow fungicide sprays for control of seedling disease of cotton caused by Pythium spp.
and Rhizoctonia solani.
Location: Wiregrass Research and Extension Center, Headland, Alabama
Cultivar: 'Stoneville 474'
Planting:
Date: April 21, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Two- row plots, rows 25 feet long, 36 inches wide, blocks separated by 20-foot alley
Seeding Rate: 125 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: All fungicides were either applied as an in-furrow spray at planting or granular applica-
tion at planting. All in-furrow sprays were applied as a broadcast spray with flat tip nozzles (8002E) calibrated to
deliver 20 GPA at 30 PSI. Granular treatments were applied with chemical boxes attached to the planter. Two rows of
each plot were infested with millet seed inoculated with Pythium spp. and R. soloni (Table 1).
Planting Assessment: Stand counts were made on May 5, May 19, and June 2, 2000.
Harvest: Plants were harvested on October 23, 2000.
Results:
Inoculated Study (Table 1). Cotton seedling disease incidence was moderate and a severe drought affected
yields. Significant differences in seedling stand were observed at 2 and 4 weeks after planting. At 2 weeks after
planting, Quardis 2SC and both rates of Rovral 4CF produced significantly higher stands than the untreated
control. At 4 weeks after planting, Quadris 2SC, Rovral 4CF 5.2 fluid ounces per acre, and Terraclor 2E treatments
significantly improved stands compared to the untreated control. However, no treatment significantly lowered the
skip index indicating a more evenly spaced seedling stand compared to the control at 6 weeks after planting. Seed
cotton yields varied 889 pounds per acre in the Rovral 4CF and the Quadris 2SC treatments, respectively. The
average yield of seed cotton from the fungicide-treated plots was 382 pounds per acre greater than the yield of the
untreated control.
Uninoculated Study (Table 2). Cotton seedling disease incidence was light and a severe drought reduced
yields. Significant differences in seedineing stand were not observed between treatments at 2, 4, and 6 weeks after
planting. Plant stands ranged from a high of 2.53 to a low of 2.13 at 6 weeks after planting. No fungicide treatment
produced a significantly lower skip index indicating a more evenly spaced seedling stand compared to the control at
6 weeks after planting. Seed cotton yields differed by 851 pounds per acre for the Terraclor 15G and the Ridomil
Gold treatments, respectively. The average yield of seed cotton from the ten fungicide-treated plots was 390 pounds per
acre greater than the yield of the untreated control.
16 ALABAMA AGRICULTURAL EXPERIMENT STATION
TABLE 1 (INOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND, SKIP
INDEX, AND YIELD IN SOUTHEAST ALABAMA
Skip Seed
Treatment and rate Application Stand' index
2  
cotton lb/ac
May 5 May 19 June 2 June 2 Oct.23
Untreated control - 65.0 71.7 69.8 3.7 1295.0
Terraclor Super X 18.8G 5.5 lb/ac In furrow 62.0 67.5 67.5 5.2 1759.0
Terraclor Super X EC 48 fl oz/ac In furrow 71.5 76.8 74.3 3.5 1953.0
Terraclor 2E 48 fl oz/ac In furrow 65.2 79.8 76.3 2.0 1643.0
Terraclor 15G lb/ac In furrow 65.0 72.5 69.0 2.7 1875.0
Terraclor 4F 24 fl oz/ac In furrow 69.5 77.0 74.0 3.8 1972.0
Rovral 4 CF 5.2 fl oz/ac In furrow 75.0 80.8 80.2 2.5 2068.0
Rovral 4 CF 6 fl oz/ac In furrow 73.3 75.7 74.8 4.0 1469.0
Ridomil Gold 7 lb/ac In furrow 65.0 71.5 69.2 6.3 1469.0
Quadris 2 SC 5.56 fl oz/ac In furrow 77.3 83.3 78.7 2.5 1179.0
Ridomil Gold PC 1.0 fl oz/1000 ft In furrow 72.7 77.8 75.0 5.0 1392.0
LSD (0.05) 11.0 10.8 14.4 4.0 404.1
'Number of live seedlings per 30 ft of row; all rows received 125 seed.
2 Skip index ratings on 25 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
TABLE 2 (UNINOCULATED STUDY). EFFECT OF SELECTED IN-FURROW TREATMENTS ON COTTON STAND,
SKIP INDEX, AND YIELD IN SOUTHEAST ALABAMA
Skip Seed
Treatment and rate Application Stand' index
2  
cotton lb/ac
May 5 May 19 June 2 June 2 Oct. 23
Untreated control - 65.5 64.5 62.2 7.8 1199.0
Terraclor Super X 18.8G 5.5 lb/ac In furrow 63.8 66.8 63.3 7.7 1431.0
Terraclor Super X 2EC 48 fl oz/ac In furrow 55.5 52.8 53.0 13.3 1701.0
Terraclor 2E 48 fl oz/ac In furrow 56.8 56.7 54.0 9.3 1759.0
Terraclor 15G 5 lb/ac In furrow 54.7 59.8 55.7 8.8 2030.0
Terraclor 4F 24 fl oz/ac In furrow 57.0 57.2 55.3 11.5 1469.0
Rovral 4 CF 5.2 fl oz/ac In furrow 60.3 61.5 59.0 7.8 1489.0
Rovral 4 CF 6 fl oz/ac In furrow 57.8 60.3 57.2 9.2 1411.0
Ridomil Gold 7 lb/ac In furrow 62.7 65.2 63.2 6.3 1914.0
Quadris 2 SC 5.56 fl oz/ac In furrow 62.0 66.2 63.7 8.3 1179.0
Ridomil Gold 1.0 fl oz/1000 ft In furrow 64.3 61.8 56.5 11.0 1295.0
LSD (0.05) 11.0 12.0 12.3 7.9 428.6
'Number of live seedlings per 30 ft of row; all rows received 125 seed.
2 Skip index ratings on 25 ft of row. Rating scale: 1 = 1 ft gap; 2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants.
Means compared using Fisher's protected least significant difference test (P=0.05).
17MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000
Evaluation of Selected Fungicides for Control
of Seedling Disease in Ultra Narrow Row Cotton
K.S. McLean, H.L. Campbell, A.J. Palmateer, C.D. Monks, and D.P. Delaney
Objective: Evaluate in-furrow fungicide spray and seed treatment in ultra narrow row cotton for control of seedling
disease caused by Pythium spp. and Rhizoctonia solani.
Location: EV Smith Research Center, Field Crops Unit, Shorter, Alabama
Cultivar: 'DPL 458 B/RR'
Planting:
Date: April 11, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Eighteen-row plots, rows 25 feet long, 7 inches wide, blocks separated by 20-foot alley
Seeding Rate: 180,000 seed per acre
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: Seed were planted using a cone type drill. All fungicides were either applied as a seed
treatment before planting or as a broadcast spray at planting. All broadcast sprays were applied as a broadcast
spray with flat tip nozzles (8002E) calibrated to deliver 20 GPA at 30 PSI. Granular treatments were applied with the
seed at planting. Each plot was infested with Pythium spp. and R. solani by applying inoculated millet seed in the
furrow at planting.
Planting Assessment: Stand counts were made on April 25, May 10, and May 23, 2000. Open bolls were counted
on August 9, 2000.
Harvest: Plants were harvested on August 24, 2000.
Results: Cotton seedling disease incidence was moderate. Significant differences in seedling stand were observed.
At 2 and 4 weeks after planting, all fungicide treatments increased stands over the control except Ridomil Gold 7
pounds per acre. TSX EC, Rovral 4 F, Ridomil Gold, and Quadris 2SC produced a significantly more uniform stand
than the control at 6 weeks after planting. No significant differences were observed in the percent of open bolls.
Seed cotton yields varied 214 pounds per acre for the Delta Coat AD and the TSX EC treatments, respectively, with
no significant differences between any treatments. The average yield of seed cotton from the fungicide-treated plots
was not greater than the yield of the untreated control.
EFFECT OF SELECTED FUNGICIDES ON COTTON STAND, SKIP INDEX, M ATURITY, AND YIELD
IN ULTRA NARROW Row COTTON
Skip Open Seed cotton
Treatment and rate 
-Stand per 25 ft of row- 
index
2  
bolls (%) lb/ac
Application April 25 May 10 May 23 May 23 Aug. 9 Aug. 23
Untreated control - 33.50 36.00 41.50 17.17 44.68 2020
TSX 18.8G 5.5 lb/ac In-furrow 45.10 45.33 42.50 16.67 54.82 1906
TSX EC 48 fl oz/ac Broadcast 42.66 41.83 40.08 14.83 45.75 2089
Rovral 4CF 5.2 fl oz/ac Broadcast 43.17 45.67 42.92 12.17 50.23 2016
Ridomil Gold 7 lb/ac In-furrow 34.33 36.00 41.58 16.00 49.27 2090
Ridomil Gold 1.0 fl oz/1000 row ft Broadcast 46.00 45.50 43.44 14.67 45.80 1917
Quadris 2.08 SC 6.0 fl oz/ac Broadcast 43.00 43.83 41.50 15.83 46.50 2035
Delta Coat AD 11.75 fl oz/cwt Seed treatment 44.83 44.17 40.50 17.17 54.87 1875
LSD (0.05) 6.90 8.29 6.47 4.18 15.45 286.17
Number of live seedlings per 25 ft of row; all rows received 67 seed. 2 Skip index ratings on 25 ft of row. Rating scale: 1 = 1 ft gap;
2 = 2 ft gap; 3 = 3ft gap;... 25 = no plants. Means compared using Fisher's protected least significant difference test (P=0.05).
18 ALABAMA AGRICULTURAL EXPERIMENT STATION
Evaluation of Selected Fungicides for Control
of Cotton Boll Rot Disease on Cotton
K.S. McLean, G.W. Lawrence, A.J. Palmateer, and M. Pegues
Objective: Evaluate the efficacy of selected fungicides for the control of boll rot disease of cotton.
Location: Gulf Coast Research and Extension Center, Fairhope, Alabama
Cultivar: 'DPL NuCotn 33B'
Planting:
Date: June 4, 2000
Experimental Design: Randomized complete block with five replications
Plot Design: Two- row plots, rows 40 feet long, 38 inches wide, blocks separated by 10-foot alley
Seeding Rate: 200 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: Fungicides were applied as a foliar spray using TX-12 cone nozzles mounted on ground
slides spraying upward calibrated to deliver 25 GPA at 75 PSI.
Planting Assessment: Diseased boll were counted on October 14, 2000.
Harvest: Plants were harvested on November 3, 2000.
Results: The incidence of boll rot was very limited due to the extended drought. Folicur 3.6E applied at full bloom and
Benlate 50 WP applied twice at first and full bloom significantly reduced the number of rotted cotton bolls as compared to
the control. Cotton boll rot was not significantly reduced by two applications of any of the other fungicides. Seed cotton
yields varied by only 159 pounds per acre for the Quadris 2SC first bloom and Terraclor 4F first bloom applications. No
treatments produced a significantly greater yield than the control. However, the average of the first bloom, first bloom +
full bloom, and full bloom applications increased cotton yield an average of 19, 53, and 66 pounds per acre, respectively.
EFFECT OF SELECTED FUNGICIDES FOR CONTROL OF COTTON BOLL ROT
Treatment and rate (acre) Spray schedule Diseased bolls' Seed cotton yield (lb/ac)
October 14 November 2
Quadris 2SC 0.20 lb ai First bloom 3.4 abc 2070
Quadris 2SC 0.20 lb ai First + full bloom 3.6 abc 2027
Quadris 2SC 0.20 lb ai Full bloom 4.8 abc 2113
Benlate 50 WP 0.10 lb ai First bloom 3.6 abc 1973
Benlate 50 WP 0.10 lb ai First + full bloom 3.4 abc 2063
Benlate 50 WP 0.10 lb ai Full bloom 3.0 c 2009
Folicur 3.6F 7.2 fl oz First bloom 5.6 abc 2021
Folicur 3.6F 7.2 fl oz First + full bloom 3.0 c 2009
Folicur 3.6F 7.2 fl oz Full bloom 5.2 abc 2063
Terraclor 4 F 16 oz First bloom 4.6 abc 1911
Terraclor 4 F 16 oz First + full bloom 4.4 abc 2023
Terraclor 4 F16 oz Full bloom 3.4 abc 1992
Rovral 4F 4 oz First bloom 6.2 a 1953
Rovral 4F 4 oz First + full bloom 3.8 abc 1977
Rovral 4F 4 oz Full bloom 3.2 bc 1982
Untreated control - 6.0 ab 1966
LSD (0.05) 2.93 175.23
Means compared using Fisher's protected least significant difference test (P=0.05). I Number of diseased bolls per 50 ft of row.
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000
19
Evaluation of Quadris for Control
of Cotton Boll Rot Disease on Cotton
K.S. McLean, G.W. Lawrence, A.J. Palmateer, and M. Pegues
Objective: Evaluate the efficacy of selected fungicides for the control of boll rot disease of cotton.
Location: Gulf Coast Research and Extension Center, Fairhope, Alabama
Cultivar: 'DPL NuCotn 33B'
Planting:
Date: June 4, 2000
Experimental Design: Randomized complete block with five replications
Plot Design: Two- row plots, rows 50 feet long, 38 inches wide, blocks separated by 10-foot alley
Seeding Rate: 250 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: Fungicides were applied as a foliar spray using TX-12 cone nozzles mounted on ground
slides spraying upward calibrated to deliver 25 GPA at 75 PSI.
Planting Assessment: Diseased boll were counted on September 16, September 29, and October 14, 2000.
Harvest: Plants were harvested on November 3, 2000.
Results: The incidence of boll rot was very limited due to the drought. Quadris 2SC reduced the total number of
rotted cotton bolls as compared to the control. Cotton boll rot was reduced by two applications of Quadris 2SC
applied at first and full bloom and by the three applications applied at pin head square, first, and full bloom. No
treatments significantly increased yield above that recorded for the untreated control.
EFFECT OF SELECTED FUNGICIDES ON BOLL ROT OF COTTON
Total Seed cotton
Treatment and rate Application - Percent diseased bolls' diseased bolls yield
Sept. 16 Sept. 29 Oct. 14 lb/ac
Untreated control - 1.18 5.23 3.82 10.23 2073.98
Quadris 0.15 lb ai/ac pin head square 7.63 3.37 1.58 12.59 2087.36
Quadris 0.15 lb ai/ac first bloom 4.08 1.90 0.45 6.43 2095.00
Quadris 0.15 lb ai/ac full bloom 2.90 4.10 2.28 9.28 2079.71
Quadris 0.15 lb ai/ac pin head square 6.90 7.02 0.52 14.44 2049.13
and first bloom
Quadris 0.15 lb ai/ac first and full bloom 3.33 4.97 0.45 8.75 2008.99
Quadris 0.15 lb ai/ac pin head square, 4.40 2.58 1.77 8.75 2049.13
first and full bloom
LSD (0.05) 4.22 4.46 2.55 11.23 159.92
Means compared using Fisher's protected least significant difference test (P=0.05).
'Number of diseased bolls per 50 ft of row.
20 ALABAMA AGRICULTURAL EXPERIMENT STATION
Cotton Variety Response to the Reniform Nematode
K.S. McLean, G.W. Lawrence, W.S. Gazaway, A.J. Palmateer, and J.R. Akridge
Objective: To evaluate twenty cotton varieties for their response to the reniform nematode.
Location: Huxford, Alabama
Planting:
Date: May 30, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Two-row plots, rows 25 feet long, 36 inches wide, blocks separated by 20-foot alley
Seeding Rate: 125 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: Temik was applied at planting in the seed furrow with chemical granular applicators
attached to the tractor. In the other row, Di-Syston 8EC was applied as a directed spray in the seed furrow at 10 GPA
applied through 8002E flat fan nozzles. The field was not irrigated.
Insect Assessment: Reniform counts were made on October 13, 2000.
Harvest: Plants were harvested on October 13, 2000.
Results: The drought severely affected cotton growth and yield. Reniform nematode populations increased from
the initial 3000 per 150 cc of soil to an average of 4577 and 3587 per 150 cc of soil for the Temik 15G and DiSyston
treatments respectively. Temik 15 G increased seed cotton yield in half of the varieties compared to DiSyston. In
those ten varieties the final reniform population was lower in the Temik 15 G plots compared to the DiSyston plots.
No difference in yield was observed between plots in Delta Pine 458 B/RR, Delta Pearl, Sure-Grow 747, and Fiber
Max 989 indicating possible tolerance to the reniform nematode.
COTTON VARIETY RESPONSE TO THE RENIFORM NEMATODE
Treatment Reniform/ Seed cotton Treatment Reniform/ Seed cotton
150 cc of soil lb/ac 150 cc of soil lb/ac
DiSyston Temik DiSyston Temik DiSyston Temik DiSyston Temik
Stoneville X9905 3493 7184 472 428 Delta Pearl 2291 5330 900 905
Stoneville 6M045 3476 3553 721 891 SureGrow 501 B/R 4841 3013 849 731
Stoneville 4892BR 4557 3296 692 893 SureGrow 747 5124 3527 1007 944
Stoneville X9903 5948 4171 728 699 Paymaser 1560 B/R 4609 2214 540 409
Stoneville 4691B 4351 3167 668 779 Paymaster 1218 BG/RR 3656 1776 385 303
Stoneville BXN47 6128 2806 627 707 Stoneville 474 7184 2549 699 581
Delta Pine 451 B/RR 4969 4918 820 685 Phytopen 355 4095 3115 813 985
Delta Pine 458 B/RR 5381 2987 687 682 FiberMax 989 5227 3141 816 828
Delta Pine 565 3708 5201 772 641 LSD (0.05) 3115 5201 193 189
Delta Pine X9084 3115 2394 651 726
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 21
Management of the Reniform Nematode
with Anhydrous Ammonia
K.S. McLean, G.W. Lawrence, W.S. Gazaway, A.3. Palmateer, and R. Akridge
Objective: Evaluate the efficacy of anhydrous ammonia for the management ofreniformnematode.
Location: Huxford, Alabama
Cultivar: 'Suregrow 125 BR'
Planting:
Date: May 30, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Four- row plots, rows 25 feet long, 36 inches wide, blocks separated by 20-foot alley
Seeding Rate: 125 seed per row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: Anhydrous ammonia and Telone II were applied 6 weeks before planting by injecting
the chemicals 12 inches deep with shanks. Other chemical were applied at 10 GPA applied through 8002E flat fan
nozzles.
Insect Assessment: Nematode counts were made on June 2, July 5, August 2, and September 3, 2000.
Harvest: Plants were harvested on October 30, 2000.
Results: The drought severely affected cotton growth and yield. Reniform nematode populations did not increase
through the season as expected. Telone II and anhydrous ammonia at 90 units produced the average lowest
reniform nematode numbers throughout the season. The highest average population occurred in the Deny treat-
ment. Cotton seed yield was significantly increased in the Telone II and anhydrous ammonia at 90 units compared to
the Temik 15G and the Deny treatments. The yield of seed cotton from the anhydrous treatments was 193 pounds per
acre greater than the yield of the ammonium nitrate treatments.
EFFECT OF ANHYDROUS AMMONIA ON RENIFORM NEMATODE POPULATION
AND SEED COTTON YIELD
Treatment and rate Reniform/150 cc of soil
June 2 July 5 Aug. 2 Sept. 6 Oct. 3 Avg lb/ac
Anhydrous ammonia' 120 units/ac - preplant 196.8 71.5 142.2 51.3 70.5 106.46 3157
Anhydrous ammonia' 90 units/ac - preplant 135.3 66.0 60.2 59.5 145.2 93.24 26920
Ammonium nitrate' 90 units/ac - at plant 228.5 101.7 115.7 102.3 166.5 142.94 38947
Temik 15G 7 lb/ac - at plant + 226.0 82.8 107.3 83.5 139.8 127.88 31673
Ammonium nitrate 90 units/ac - at plant
Telone II' 3 gal/ac - at plant + 132.8 45.8 70.3 79.3 196.2 104.88 25526
Ammonium nitrate 90 units/ac - at plant
Deny' 1 pt/A - at plant + 207.5 98.2 161.8 68.2 264.2 159.98 38764
Ammonium nitrate 90 units/ac - at plant
LSD (0.05) 116.05 65.10 75.35 60.70 90.8 240
Note: planting rate at 10 lb/A (5 seed/ft of row); 4 ft x 25 ft long x 36 in wide.
' Di-Syston (7 lb/A - at planting) added in all treatments except treatment # 4.
22 ALABAMA AGRICULTURAL EXPERIMENT STATION
Evaluation of Selected Fungicides
for Soybean Stem Canker Control
K.S. McLean, G.W. Lawrence, A.J. Palmateer, and M. Pegues
Objective: Evaluate selected fungicides for control of soybean stem canker.
Location: Gulf Coast Research and Extension Center, Fairhope, Alabama
Cultivar: 'Kuell'
Planting:
Date: May 30, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Four-row plots, rows 25 feet long, 38 inches wide, blocks separated by 20-foot alley
Seeding Rate: 10 seed per foot of row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: Fungicides were applied at planting or at the 2-4 trifoliate leaf stage and were applied
either as seed treatments or as in-furrow sprays. In-furrow treatments were applied with a flat fan tip 8002E nozzles
calibrated to deliver 10 GPA at 30 PSI. Fungicides applied at the 2-4 leaf stage were applied as a broadcast spray
using a tractor-mounted boom calibrated to deliver 10 GPA at 30 PSI. The field was not irrigated.
Planting Assessment: Stand counts were made on July 2, 2000. Stem canker ratings were made on September 16,
2000.
Harvest: Plants were harvested on November 3, 2000.
Results: Stem canker incidence was light during the 2000 season. Seedling stands at 28 days after planting ranged
from 94 to 145 plants for the Quadris 2SC (0.1 ounce active ingredient per 1000 rft) and the RTU Vitavax Thiram (6.0
fluid ounces per cwt) treatments, respectively. Emergence was significantly reduced by Quadris applied in-furrow as
compared to the control. Stem canker incidence was highest in the RTU Vitavax Thiram (6.0 fluid ounces per cwt)
treatment as compared to all other treatments including the control. RTU Vitavax Thiram (6.0 fluid ounces per cwt)
and RTU Vitavax Thiram (3.0 fluid ounces per cwt) both had significantly lower yields compared to the control and
all other treatments.
EFFECT OF SELECTED FUNGICIDES ON CONTROL OF SOYBEAN STEM CANKER
Plants/ Stem canker Yield
Treatment and rate Application Emergence ft of row incidence 2 bu/ac
treatment July 2 July 2 Sept. 16 Nov. 3
Untreated control 104.17 4.06 7.20 29.39
Quadris 2SC 0.10 oz ai/1000 rft In furrow 94.00 4.24 3.50 30.30
Quadris 2SC + NIS 0.15 oz ai/1000 rft In furrow 108.00 3.83 3.30 29.25
Quadris 2SC 0.15 oz ai/ac 2 - 4 trifoliate 98.83 4.08 3.30 31.44
RTU Vitavax Thiram 6.0 oz/cwt Seed 145.17 5.73 14.00 28.24
RTU Vitavax Thiram 3.0 oz/cwt Seed 127.33 5.05 3.70 25.52
Allegiance FL 0.375 fl oz/cwt Seed 124.00 4.99 2.80 29.20
Apron FL 0.75 fl oz/cwt Seed 95.83 3.77 4.70 29.99
LSD (0.05) - 41.49 1.68 5.62
1
Number of live soybean plants per 25 ft of row, all rows received 250 seed.
2 Number of soybean plants with stem cankers per 25 foot of row.
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 23
Evaluation of Quadris and Benlate
for Soybean Foliar Disease Control
K.S. McLean, G.W. Lawrence, A.J. Palmateer, and M. Pegues
Objective: Evaluate selected fungicides for control of foliar diseases of soybean.
Location: Gulf Coast Research and Extension Center, Fairhope, Alabama
Cultivar: 'Kuell'
Planting:
Date: May 30, 2000
Experimental Design: Randomized complete block with six replications
Plot Design: Four-row plots, rows 25 feet long, 38 inches wide, blocks separated by 20-foot alley
Seeding Rate: 10 seed per foot of row
Cultural Practices: All plots were maintained throughout the season with standard herbicide, insecticide, and
fertility production practices as recommended by the Alabama Cooperative Extension System.
Application of Treatments: Quadris and Benlate were applied at the R3 and R5 stages of soybean growth. Fungi-
cides were applied as a broadcast spray using a two-row boom sprayer with flat tip 8001 nozzles calibrated to deliver
10 GPA at 30 PSI. The field was not irrigated.
Planting Assessment: Disease ratings were made on September 16 and October 14, 2000.
Harvest: Plants were harvested on November, 2000.
Results: Fairhope suffered a severe drought during the 2000 growing season. Thus soybean web blight incidence
was light to moderate. All fungicide applications reduced web blight incidence and severity as compared to the
control at both 100 and 128 day ratings. Yields varied 3.95 bushels per acre in the Quadris 2SC 0.15 pound active
ingredient per acre R3 application and Quadris 2SC 0.10 pound active ingredient per acre R5 application respec-
tively. No significant differences in yield were observed between fungicide treatments and the untreated control.
EFFECT OF QUADRIS AND BENLATE ON SOYBEAN FOLIAR DISEASE CONTROL
Treatment and rate (ai/ac) Timing Web blight Web blight Web blight Web blight Yield
incidence' severity
2  
incidence' severity
2  
bu/ac
Sept. 16 Sept. 16 Oct. 14 Oct. 14
Untreated control - 86.7 a 5.0 a 86.7 a 5.2 a 30.47
Quadris 2SC 0.10 lb R3 56.7 bc 2.8 bc 56.7 bc 3.3 bc 31.40
Quadris 2SC + R3 68.3b 3.0 bc 63.3 bc 3.3 bc 29.92
NIS 0.10 lb + 0.25 %
Quadris 2SC 0.15 lb R3 53.3 bc 3.2 bc 53.3 bc 3.3 bc 
32.50
Quadris 2SC 0.10 lb R5 61.7 bc 3.2 b 65.0 bc 3.8 bc 28.55
Quadris 2SC 0.15 lb R5 66.7 bc 3.2 b 66.7 b 3.3 bc 
29.63
Quadris 2SC 0.10 lb R3+R5 51.7 c 2.0 c 51.7 c 2.8 c 
30.32
Benlate 50WP 0.50 lb R3 53.3 bc 2.0 c 53.3 bc 2.5 c 
30.65
Benlate 50WP 0.50 lb R3 + R5 53.3 bc 2.2 bc 53.3 bc 3.0 bc 
29.05
LSD (0.05) 15.5 1.09 14.1 1.0 2.64
Means compared using Fisher's protected least significant difference test. ' Incidence is the percent of the total leaves 
showing
symptoms. 2 Severity is the amount of the leaf surface diseased on a 1 to 10 rating scale with 1 representing no disease and 
10
representing a dead leaf.
24 ALABAMA 
AGRICULTURAL EXPERIMENT STATION
Chemicals Used in the Soil-borne and Foliar
Disease Studies
Product Manufacturer Composition
Allegiance - FL
Apron FL
Apron XL
Bayton
Benlate 50 WP
CGA-48988
CGA-279202
Delta Coat
Dividend
Maxim
NU-Flow M
Nu-Flow T
Quadris 2SC
Ridomil Gold PC 11G
Rovral 4CF
Systhane
Terraclor 2E
Gustafson, Inc.
1400 Preston Road, Suite 400
Piano, TX 75093
Novarti s
P. O. Box 18300
Greensboro, NC 27419
Novartis
P. O. Box 18300
Greensboro, NC 27419
Gustafson, Inc.
1400 Preston Road, Suite 400
Plano, TX 75093
DU Pont
Agricultural Products
Walker's Mill, Barley Mill Plaza
Wilmington, DE 19898
Novarti s
P. O. Box 18300
Greensboro, NC 27419
Novartis
P. O. Box 18300
Greensboro, NC 27419
WILFARM
6401 North Oak Trafficway
Gladstone, MO 64118
Novartis
P. O. Box 18300
Greensboro, NC 27419
Novartis
P. O. Box 18300
Greensboro, NC 27419
WILFARM
6401 North Oak Trafficway
Gladstone, MO 64118
WILFARM
6401 North Oak Trafficway
Gladstone, MO 64118
Zeneca Ag Products
1800 Concord Pike
Post Office Box 15458
Wilmington, DE 19858-5458
Novartis
P. O. Box 18300
Greensboro, NC 27419
Adventis Crop Protection
P. O. Box 12014, 2 T. W. Alexander Drive
Research Triangle Pk, NC 27709
Rohm and Haas
Independence Mall West
Philadelphia, PA 19105
Uniroyal Chemical Inc.,
Benson Road
Middlebury, CT 06749
Metalaxyl- (2,6-dimethylphenyl)-N-
(methoxyacetyl)-alanine methyl ester
Metalaxyl -(2,6-dimethylphenyl)-N-
(methoxyacetyl)-alanine methyl ester
Metalaxyl -(2,6-dimethylphenyl)-N-
(methoxyacetyl)-alanine methyl ester
Benomyl Methyl 1-(butylcarbamonyl)-
2-benzimidazolecarbamate
unavailable
unavailable
unavailable
unavailable
Fludioxonil (R)-2-(2,6-dimethylphenyl)-
metnoxyacetyl-amino)-propionic acid
methyl ester
unavailable
unavailable
Azoxystrobin: methyl (E)-2- {2-2[-6(2-
cyanophenoxy) pymtimifin-4-
yloxy]phenyl } -3-methoxyacylate
Pentachloronitrobenzene (R)-2-
[(2,6-dimethylphenyl)-methoxacetyamino]
-propionic acid methyl ester
Iprodione:3-(3,5-dichlorophenyl)-N-(i-
methylethyl)-2,4-dioxo-1-
imnidazolidinecarboxamide
Myclobutanil
alpha-n-butyl-alpha-(4-cholorophenyl)
-1H-1,2,4 triazole-1-propanenitrile
Quintozene
Pentachloronitrobenzene
continued
MANAGEMENT OF DISEASES ON COTTON AND SOYBEAN 2000 25
ALABAMA AGRICULTURAL EXPERIMENT STATION
Chemicals Used in the Soil-borne and Foliar Disease Studies,
continued
Product Manufacturer Composition
Terraclor 15G Uniroyal Chemical Inc., Quintozene
Benson Road Pentachloronitrobenzene
Middlebury, CT 06749
Terraclor Super X 18.8G Uniroyal Chemical Inc., Quintozene
Benson Road Pentachloronitrobenzene
Middlebury, CT 06749
Terraclor Super X EC Uniroyal Chemical Inc., Pentachloronitrobenzene
Benson Road 5-Ethoxy-3-(trichloromethyl)-1,2,4-
Middlebury, CT 06749 thiadiazole
Thiram Novartis Thiram
P. O. Box 18300 tetramethyl thiuram disulfide
Greensboro, NC 27419
26