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EVALUATION OF AN IN-FURROW AND SEED APPLIED INSECTICIDES, WITH AND WITHOUT ADDITIONAL BROADCAST APPLICATION FOR CONTROL OF THRIPS, 2004B

EVALUATION OF AN IN-FURROW AND SEED APPLIED INSECTICIDES, WITH AND WITHOUT ADDITIONAL BROADCAST... (F45) COTTON: Gossypium hirsutum L., ‘DP 432 RR’ EVALUATION OF AN IN-FURROW AND SEED APPLIED INSECTICIDES, WITH AND WITHOUT ADDITIONAL BROADCAST APPLICATION FOR CONTROL OF THRIPS , 2004B D. A. Herbert, Jr. Virginia Tech Tidewater Agric. Res. & Ext. Ctr. 6321 Holland Road Suffolk, VA 23437 Phone: (757) 657-6450, Ext. 122 Fax: (757) 657-9333 E-mail: herbert@vt.edu S. Malone C. Goerger Tobacco thrips (TT): Frankliniella fusca (Hinds) Selected insecticides applied onto seed or into the seed furrow at planting, both with and without an st additional broadcast treatment at first true leaf stage (BC at 1 tl), and an insecticide with broadcast applications at both first true leaf and 2-3 leaf stages (BC at 2-3 leaf), were evaluated for control of thrips. ‘Delta Pine 432 RR’ cotton was planted 28 Apr at the Virginia Tech Tidewater Agric. Res. & Ext. Ctr., Suffolk, VA, using 36-inch row spacing. In-furrow (IF) treatments were applied into the seed furrow at the time of planting using tractor-mounted inverted jars with lid holes calibrated to deliver exact amounts via gravity. Gaucho 480 seed treatment was applied commercially. The foliar treatments were applied with a CO pressurized backpack sprayer as a broadcast at 14.3 gpa and 18 psi through 8002VS nozzles spaced 18 inches apart on the spray boom. Foliar applications were made on 17 May at the first sign of true leaf emergence after the cotyledon stage and on 24 May at the 2-3 leaf stage. A RCB design was used with 4 replicates; plots were 4 rows by 40 ft. Thrips injury to plants was determined by visually rating injury using a 0 to 5 scale, where 0 = no thrips induced plant injury, 1 = 10% injured leaves, no bud injury; 2 = 25% injured leaves, no bud injury; 3 = 75% injured leaves, and 0 to 25% buds injured; 4 = 90% injured leaves, and greater than 25% buds injured; and 5 = dead plants. Yield was determined by harvesting the 2 center rows of each plot (80 row ft) using a commercial 2-row John Deere cotton picker. Sub-samples were ginned to determine lint versus seed and trash weight (40% lint, 60% seed and trash). Data were analyzed using ANOVA and means were separated with LSD (P ≤ 0.10). Thrips injury reached a peak of 4.2 during the last week of May in the untreated check. All treatments, with the exception of Orthene 97 with broadcast applications at both first true leaf and 2-3 leaf stages on 18 May, had significantly lower plant injury levels compared with the untreated check on all sample dates. The Orthene 97 with broadcast applications at both first true leaf and 2-3 leaf stages treatment had significantly more plant injury than the other treatments for all injury ratings. Overall, broadcast treatments of Orthene 97 somewhat improved levels of thrips control in the Gaucho 480 and Temik 15G treatments. All treatments resulted in significantly higher lint yields compared with the untreated check. Yield increases compared with the untreated check averaged 267 lb lint/acre and ranged from 189 to 373 lb lint/acre. Thrips injury rating Treatment/ Lint yield formulation Rate 18 May 24 May 28 May 1 Jun lb/acre Gaucho 480 0.23 mg (AI)/seed 0.63b 0.69c 0.63c 0.63c 1488ab Gaucho 480 0.23 mg (AI)/seed c st + Orthene 97 0.24 lb (AI)/acre (BC at 1 tl) 0.63b 0.25d 0.25d 0.38cd 1627a c st Orthene 97 0.24 lb (AI)/acre (BC at 1 tl) + Orthene 97 0.24 lb (AI)/acre (BC at 2-3 leaf) 3.50a 3.63b 2.50b 1.00b 1443b Temik 15G 0.75 lb (AI)/acre (IF) 0.50b 0.56c 0.25d 0.31d 1475ab Temik 15G 0.75 lb (AI)/acre (IF ) c st + Orthene 97 0.24 lb (AI)/acre (BC at 1 tl) 0.63b 0.25d 0.25d 0.25d 1574ab Untreated --- 3.50a 4.00a 4.19a 3.75a 1254c LSD 0.20 0.20 0.11 0.25 180.7 Means within a column followed by the same letter(s) are not significantly different (LSD; P > 0.01). Thrips injury rated on a 0-5 scale, 0=no thrips and 5=dead plants. Cotton was planted on 28 Apr and harvested on 27 Oct. Gross yields were reduced by 60% to account for seed and trash. IF = in furrow; BC = broadcast. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF AN IN-FURROW AND SEED APPLIED INSECTICIDES, WITH AND WITHOUT ADDITIONAL BROADCAST APPLICATION FOR CONTROL OF THRIPS, 2004B

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Abstract

(F45) COTTON: Gossypium hirsutum L., ‘DP 432 RR’ EVALUATION OF AN IN-FURROW AND SEED APPLIED INSECTICIDES, WITH AND WITHOUT ADDITIONAL BROADCAST APPLICATION FOR CONTROL OF THRIPS , 2004B D. A. Herbert, Jr. Virginia Tech Tidewater Agric. Res. & Ext. Ctr. 6321 Holland Road Suffolk, VA 23437 Phone: (757) 657-6450, Ext. 122 Fax: (757) 657-9333 E-mail: herbert@vt.edu S. Malone C. Goerger Tobacco thrips (TT): Frankliniella fusca (Hinds) Selected insecticides applied onto seed or into the seed furrow at planting, both with and without an st additional broadcast treatment at first true leaf stage (BC at 1 tl), and an insecticide with broadcast applications at both first true leaf and 2-3 leaf stages (BC at 2-3 leaf), were evaluated for control of thrips. ‘Delta Pine 432 RR’ cotton was planted 28 Apr at the Virginia Tech Tidewater Agric. Res. & Ext. Ctr., Suffolk, VA, using 36-inch row spacing. In-furrow (IF) treatments were applied into the seed furrow at the time of planting using tractor-mounted inverted jars with lid holes calibrated to deliver exact amounts via gravity. Gaucho 480 seed treatment was applied commercially. The foliar treatments were applied with a CO pressurized backpack sprayer as a broadcast at 14.3 gpa and 18 psi through 8002VS nozzles spaced 18 inches apart on the spray boom. Foliar applications were made on 17 May at the first sign of true leaf emergence after the cotyledon stage and on 24 May at the 2-3 leaf stage. A RCB design was used with 4 replicates; plots were 4 rows by 40 ft. Thrips injury to plants was determined by visually rating injury using a 0 to 5 scale, where 0 = no thrips induced plant injury, 1 = 10% injured leaves, no bud injury; 2 = 25% injured leaves, no bud injury; 3 = 75% injured leaves, and 0 to 25% buds injured; 4 = 90% injured leaves, and greater than 25% buds injured; and 5 = dead plants. Yield was determined by harvesting the 2 center rows of each plot (80 row ft) using a commercial 2-row John Deere cotton picker. Sub-samples were ginned to determine lint versus seed and trash weight (40% lint, 60% seed and trash). Data were analyzed using ANOVA and means were separated with LSD (P ≤ 0.10). Thrips injury reached a peak of 4.2 during the last week of May in the untreated check. All treatments, with the exception of Orthene 97 with broadcast applications at both first true leaf and 2-3 leaf stages on 18 May, had significantly lower plant injury levels compared with the untreated check on all sample dates. The Orthene 97 with broadcast applications at both first true leaf and 2-3 leaf stages treatment had significantly more plant injury than the other treatments for all injury ratings. Overall, broadcast treatments of Orthene 97 somewhat improved levels of thrips control in the Gaucho 480 and Temik 15G treatments. All treatments resulted in significantly higher lint yields compared with the untreated check. Yield increases compared with the untreated check averaged 267 lb lint/acre and ranged from 189 to 373 lb lint/acre. Thrips injury rating Treatment/ Lint yield formulation Rate 18 May 24 May 28 May 1 Jun lb/acre Gaucho 480 0.23 mg (AI)/seed 0.63b 0.69c 0.63c 0.63c 1488ab Gaucho 480 0.23 mg (AI)/seed c st + Orthene 97 0.24 lb (AI)/acre (BC at 1 tl) 0.63b 0.25d 0.25d 0.38cd 1627a c st Orthene 97 0.24 lb (AI)/acre (BC at 1 tl) + Orthene 97 0.24 lb (AI)/acre (BC at 2-3 leaf) 3.50a 3.63b 2.50b 1.00b 1443b Temik 15G 0.75 lb (AI)/acre (IF) 0.50b 0.56c 0.25d 0.31d 1475ab Temik 15G 0.75 lb (AI)/acre (IF ) c st + Orthene 97 0.24 lb (AI)/acre (BC at 1 tl) 0.63b 0.25d 0.25d 0.25d 1574ab Untreated --- 3.50a 4.00a 4.19a 3.75a 1254c LSD 0.20 0.20 0.11 0.25 180.7 Means within a column followed by the same letter(s) are not significantly different (LSD; P > 0.01). Thrips injury rated on a 0-5 scale, 0=no thrips and 5=dead plants. Cotton was planted on 28 Apr and harvested on 27 Oct. Gross yields were reduced by 60% to account for seed and trash. IF = in furrow; BC = broadcast.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2005

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