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EFFICACY OF SELECTED INSECTICIDES AGAINST TARNISHED PLANT BUG IN COTTON, 2011B

EFFICACY OF SELECTED INSECTICIDES AGAINST TARNISHED PLANT BUG IN COTTON, 2011B Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F44 (F44) COTTON: Gossypium hirsutum (L.) J. Eric Howard University of Arkansas Division of Agriculture Department of Entomology 1408 Scogin Drive Monticello, AR 71656 Phone: (870) 460-1393 Fax: (870) 460-1415 E-mail: howardje@uamont.edu D. Scott Akin E-mail: sakin@uaex.edu Tarnished plant bug (TPB): Lygus lineolaris (Palsot de Beauvois) Two concurrent experiments with nearly identical treatments were conducted to evaluate foliar insecticides for control of TPB. Treatments from both trials were applied to blooming cotton on 1 Aug at a commercial farm near Kelso, AR. Plot size was 8 rows (38-inch centers) x 60 ft long, and arranged in an RCB design with four replications. Treatment applications were made with a John ® ® Deere 6500 high-clearance sprayer equipped with a rear-mounted CO -charged multi-boom system (R&D Sprayers , Opelousas, LA) calibrated to deliver 7.5 gpa through Teejet TX-6 hollow cone nozzles (19-inch nozzle spacing). Treatment efficacy was evaluated at 4, 7, and 11 DAT by sampling the middle 2 rows of each plot with a standard black 2.5-ft shake sheet (2 drops=10 row-ft per plot). Data at 4 DAT were square root-transformed prior to analysis. All data were subjected to ANOVA and means separated using DNMRT (α=0.05). Experiment A (Table 1). At 4 DAT, all treatments except for the lower rate of Besiege reduced plant bug populations relative to the untreated check. The most effective treatments at 4 DAT contained Orthene, either alone or in combination with Leverage 360. At 7 DAT, there were 32.9 TPB/10 row-feet in the untreated check, and all treatments had statistically fewer TPB than the untreated check. Several treatments exhibited good control, but only Orthene at 0.75 lb ai/A reduced numbers below economic threshold. At 11 DAT, Only Centric, Leverage+Orthene, Leverage+Diamond, Endigo, Orthene alone, and Transform had significantly fewer TPB than the untreated check. All treatments were above threshold at 11 DAT, suggesting the need for a subsequent insecticide application. Experiment B (Table 2). As was the case in Experiment A, only Besiege at 0.88 lb ai/A was not significantly different from the untreated check with regards to TPB numbers. The most effective treatments appeared to contain Orthene, Bidrin, and Leverage 360 at 4 DAT. At 7 DAT, all treatments, including Besiege, reduced plant bug numbers below the untreated check. However, treatments that held numbers below economic threshold included Leverage+Orthene, Leverage+Diamond, Orthene, Bidrin, and Transform, the latter of which only resulted in 1.2 TPB/10 row feet at 7 DAT. Other treatments would require subsequent insecticide application in a grower scenario. This research was supported by industry gifts of products and research funding. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F44 Table 1. tarnished plant bug (No./10 row ft) Treatment/ Rate lb formulation (AI)/acre 4 DAT 7 DAT 11 DAT CMT 4586 - 12.2bcd 9.0cde 17.0bcd Centric 40WG 0.05 14.4bc 6.0de 10.0d Besiege 1.252SC 0.088 20.0ab 22.0b 32.6a Besiege 1.252SC 0.1223 15.6bc 21.6b 24.6abc Leverage 360SC 0.075 9.8bcd 16.2bc 16.6bcd Leverage 360SC 0.075 + 5.4cd 6.8de 7.6d + Orthene 97WG 0.5 Leverage 360SC 0.075 16.0bc 20.2b 15.6bcd Leverage 360SC 0.075 + 15.4bc 9.0cde 12.0d + Diamond 0.83EC 0.0389 Endigo 2.06ZC 0.0805 12.8bc 14.2bcd 14.0cd Orthene 97WG 0.75 3.2d 4.2e 11.0d Bidrin 8WM 0.5 12.4bcd 9.8cde 16.6bcd Transform 50WG 0.0703 9.4bcd 6.2de 7d Untreated check - 32.2a 32.9a 25.6ab P>F (ANOVA) 0.0027 <0.0001 <0.0001 Means within columns followed by a common letter are not significantly different (DNMRT; P=0.05). Methylated seed oil (100% AI/gal) added at 0.25% v/v, and UAN (28% AI/gal) added at 2.5% v/v Non-ionic surfactant (99% AI/gal) added at 0.25% v/v Crop oil concentrate (99% AI/gal) added at 1% v/v Table 2. tarnished plant bug (No./10 row ft) Treatment/ formulation Rate lb (AI)/acre 4 DAT 7 DAT CMT 4586 - 16.6b 8.0cd Centric 40WG 0.05 13.6bc 9.8c Besiege 1.252SC 0.088 25.2a 17.2b Leverage 360SC 0.075 5.4bcd 7.6cd Leverage 360SC 0.075 + 4.0d 3.6de + Orthene 97WG 0.5 Leverage 360SC 0.075 12.6bc 6.2cde Leverage 360SC 0.075+ 10.2bcd 4.2cde + Diamond 0.83EC 0.0389 Endigo 2.06ZC 0.0805 9.8bcd 7.6cd Orthene 97WG 0.75 4.8d 2.2de Bidrin 8WM 0.5 4.0d 2.4cde Transform 50WG 0.0703 7.2cd 1.2e Untreated check - 27.8a 29.4a P>F (ANOVA) <0.0001 <0.0001 Means within columns followed by a common letter are not significantly different (DNMRT; P=0.05). Methylated seed oil (100% AI/gal) added at 0.25% v/v, and UAN (28% AI/gal) added at 2.5% v/v Non-ionic surfactant (99% AI/gal) added at 0.25% v/v Crop oil concentrate (99% AI/gal) added at 1% v/v http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF SELECTED INSECTICIDES AGAINST TARNISHED PLANT BUG IN COTTON, 2011B

Eric Howard, J.; Scott Akin, D.
Arthropod Management Tests , Volume 37 (1) – Jan 1, 2012
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10.4182/amt.2012.F44
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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F44 (F44) COTTON: Gossypium hirsutum (L.) J. Eric Howard University of Arkansas Division of Agriculture Department of Entomology 1408 Scogin Drive Monticello, AR 71656 Phone: (870) 460-1393 Fax: (870) 460-1415 E-mail: howardje@uamont.edu D. Scott Akin E-mail: sakin@uaex.edu Tarnished plant bug (TPB): Lygus lineolaris (Palsot de Beauvois) Two concurrent experiments with nearly identical treatments were conducted to evaluate foliar insecticides for control of TPB. Treatments from both trials were applied to blooming cotton on 1 Aug at a commercial farm near Kelso, AR. Plot size was 8 rows (38-inch centers) x 60 ft long, and arranged in an RCB design with four replications. Treatment applications were made with a John ® ® Deere 6500 high-clearance sprayer equipped with a rear-mounted CO -charged multi-boom system (R&D Sprayers , Opelousas, LA) calibrated to deliver 7.5 gpa through Teejet TX-6 hollow cone nozzles (19-inch nozzle spacing). Treatment efficacy was evaluated at 4, 7, and 11 DAT by sampling the middle 2 rows of each plot with a standard black 2.5-ft shake sheet (2 drops=10 row-ft per plot). Data at 4 DAT were square root-transformed prior to analysis. All data were subjected to ANOVA and means separated using DNMRT (α=0.05). Experiment A (Table 1). At 4 DAT, all treatments except for the lower rate of Besiege reduced plant bug populations relative to the untreated check. The most effective treatments at 4 DAT contained Orthene, either alone or in combination with Leverage 360. At 7 DAT, there were 32.9 TPB/10 row-feet in the untreated check, and all treatments had statistically fewer TPB than the untreated check. Several treatments exhibited good control, but only Orthene at 0.75 lb ai/A reduced numbers below economic threshold. At 11 DAT, Only Centric, Leverage+Orthene, Leverage+Diamond, Endigo, Orthene alone, and Transform had significantly fewer TPB than the untreated check. All treatments were above threshold at 11 DAT, suggesting the need for a subsequent insecticide application. Experiment B (Table 2). As was the case in Experiment A, only Besiege at 0.88 lb ai/A was not significantly different from the untreated check with regards to TPB numbers. The most effective treatments appeared to contain Orthene, Bidrin, and Leverage 360 at 4 DAT. At 7 DAT, all treatments, including Besiege, reduced plant bug numbers below the untreated check. However, treatments that held numbers below economic threshold included Leverage+Orthene, Leverage+Diamond, Orthene, Bidrin, and Transform, the latter of which only resulted in 1.2 TPB/10 row feet at 7 DAT. Other treatments would require subsequent insecticide application in a grower scenario. This research was supported by industry gifts of products and research funding. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F44 Table 1. tarnished plant bug (No./10 row ft) Treatment/ Rate lb formulation (AI)/acre 4 DAT 7 DAT 11 DAT CMT 4586 - 12.2bcd 9.0cde 17.0bcd Centric 40WG 0.05 14.4bc 6.0de 10.0d Besiege 1.252SC 0.088 20.0ab 22.0b 32.6a Besiege 1.252SC 0.1223 15.6bc 21.6b 24.6abc Leverage 360SC 0.075 9.8bcd 16.2bc 16.6bcd Leverage 360SC 0.075 + 5.4cd 6.8de 7.6d + Orthene 97WG 0.5 Leverage 360SC 0.075 16.0bc 20.2b 15.6bcd Leverage 360SC 0.075 + 15.4bc 9.0cde 12.0d + Diamond 0.83EC 0.0389 Endigo 2.06ZC 0.0805 12.8bc 14.2bcd 14.0cd Orthene 97WG 0.75 3.2d 4.2e 11.0d Bidrin 8WM 0.5 12.4bcd 9.8cde 16.6bcd Transform 50WG 0.0703 9.4bcd 6.2de 7d Untreated check - 32.2a 32.9a 25.6ab P>F (ANOVA) 0.0027 <0.0001 <0.0001 Means within columns followed by a common letter are not significantly different (DNMRT; P=0.05). Methylated seed oil (100% AI/gal) added at 0.25% v/v, and UAN (28% AI/gal) added at 2.5% v/v Non-ionic surfactant (99% AI/gal) added at 0.25% v/v Crop oil concentrate (99% AI/gal) added at 1% v/v Table 2. tarnished plant bug (No./10 row ft) Treatment/ formulation Rate lb (AI)/acre 4 DAT 7 DAT CMT 4586 - 16.6b 8.0cd Centric 40WG 0.05 13.6bc 9.8c Besiege 1.252SC 0.088 25.2a 17.2b Leverage 360SC 0.075 5.4bcd 7.6cd Leverage 360SC 0.075 + 4.0d 3.6de + Orthene 97WG 0.5 Leverage 360SC 0.075 12.6bc 6.2cde Leverage 360SC 0.075+ 10.2bcd 4.2cde + Diamond 0.83EC 0.0389 Endigo 2.06ZC 0.0805 9.8bcd 7.6cd Orthene 97WG 0.75 4.8d 2.2de Bidrin 8WM 0.5 4.0d 2.4cde Transform 50WG 0.0703 7.2cd 1.2e Untreated check - 27.8a 29.4a P>F (ANOVA) <0.0001 <0.0001 Means within columns followed by a common letter are not significantly different (DNMRT; P=0.05). Methylated seed oil (100% AI/gal) added at 0.25% v/v, and UAN (28% AI/gal) added at 2.5% v/v Non-ionic surfactant (99% AI/gal) added at 0.25% v/v Crop oil concentrate (99% AI/gal) added at 1% v/v

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Published: Jan 1, 2012

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