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EVALUATION OF NEONICOTINOIDS AND FLONICAMID AGAINST COTTON APHIDS AND TARNISHED PLANT BUGS IN COTTON, 2006

EVALUATION OF NEONICOTINOIDS AND FLONICAMID AGAINST COTTON APHIDS AND TARNISHED PLANT BUGS IN... (F22) COTTON: Gossypium hirsutum L., 'Stoneville 4646 B2R' EVALUATION OF NEONICOTINOIDS AND FLONICAMID AGAINST COTTON APHIDS AND TARNISHED PLANT BUGS IN COTTON, 2006 P. L. Bommireddy LSU AgCenter Department of Entomology 402 Life Sciences Bldg. Baton Rouge, LA 70803 Phone: (225) 578-1839 Fax: (225) 578-1643 E-mail: pbommireddy@agcenter.lsu.edu B. R. Leonard K. D. Emfinger P. Price LSU AgCenter Macon Ridge Research Station 212A Macon Ridge Rd. Winnsboro, LA 71295 Phone: (318) 435-2157 Fax: (318) 435-2133 Cotton aphid (CA): Aphis gossypii (Glover) Tarnished plant bug (TPB): Lygus lineolaris (Palisot de Beauvois) Selected insecticides were evaluated for control of CA and TPB at the Macon Ridge Research Station (Franklin Parish) near Winnsboro, LA. Cotton seed was planted on May 1 in a Gigger-Gilbert silt loam soil. Plots consisted of four rows (centered on 40 inches) and 50 ft in length. Treatments were arranged in a RCB design with four replications. Insecticides were applied with a tractor-mounted boom and compressed air system calibrated to deliver 10 gpa through 8001 flan fan nozzles (2/row) at 30 psi on 7 Jun. Plant terminals (40/plot) infested with colonies of CA were marked with a yellow snap- on-tag placed which was placed on the main stem immediately prior to application of the insecticides. Insecticide efficacy against CA was measured by harvesting 10 (tagged) plant terminals per plot at 2 DAT, 8 DAT, and 12 DAT. The plant terminals were transported to the laboratory in plastic bags and washed to remove all CA. Numbers of CA in each plot were counted with a binocular scope. Two TPB adults were placed into an 11.5 cm × 11.5 cm nylon mesh (no. 280) bag and caged on each of 10 plant terminals per plot within 2 HAT. Percent mortality of TPB was recorded 4 DAT. All data were subjected to ANOVA and means separated according to DMRT. No rainfall occurred during the field trial. Numbers of CA exceeded 100 insects per plant terminal at test initiation. Numbers declined in all treatments during the evaluation period. All insecticides significantly reduced the number of CA compared to that in the non-treated check at 2 DAT, 8 DAT, and 12 DAT. All insecticide treatments with the exception of Carbine at the lower rate produced TPB mortality levels significantly higher than that in the non-treated check. The higher rates of insecticides generally outperformed the lower rates in reducing numbers of CA and increasing TPB mortality. No phytotoxicity was observed from any of the insecticide treatments. CA/10 plant terminals Treatment/ Rate/acre % TPB mortality formulation lb (AI) 2 DAT 8 DAT 12 DAT 4 DAT Intruder 70WP 0.026 709.5bc 168.0cd 103.3bcd 28.5de Intruder 70WP 0.035 713.8bc 91.0d 52.5bcd 41.5bcd Intruder 70WP 0.05 195.0c 35.5d 37.0cd 55.7bc Centric 40WG 0.031 758.8bc 182.0cd 45.0bcd 62.5ab Centric 40WG 0.05 590.3bc 35.8d 23.3d 79.2a Trimax Pro 4.44SL 0.031 938.0b 420.0b 132.3bc 37.5cd Trimax Pro 4.44SL 0.047 718.5bc 292.5c 142.8b 50.0bc Carbine 50WG 0.044 710.8bc 144.3cd 108.0bcd 8.5ef Carbine 50WG 0.088 724.5bc 54.5d 65.8bcd 25.0de Untreated check --- 1602.3a 848.3a 312.0a 4.2f P > F (ANOVA) < 0.01 < 0.01 < 0.01 < 0.01 Means within columns followed by a common letter are not significantly different (DMRT; P = 0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF NEONICOTINOIDS AND FLONICAMID AGAINST COTTON APHIDS AND TARNISHED PLANT BUGS IN COTTON, 2006

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Publisher
Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/32.1.F22
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Abstract

(F22) COTTON: Gossypium hirsutum L., 'Stoneville 4646 B2R' EVALUATION OF NEONICOTINOIDS AND FLONICAMID AGAINST COTTON APHIDS AND TARNISHED PLANT BUGS IN COTTON, 2006 P. L. Bommireddy LSU AgCenter Department of Entomology 402 Life Sciences Bldg. Baton Rouge, LA 70803 Phone: (225) 578-1839 Fax: (225) 578-1643 E-mail: pbommireddy@agcenter.lsu.edu B. R. Leonard K. D. Emfinger P. Price LSU AgCenter Macon Ridge Research Station 212A Macon Ridge Rd. Winnsboro, LA 71295 Phone: (318) 435-2157 Fax: (318) 435-2133 Cotton aphid (CA): Aphis gossypii (Glover) Tarnished plant bug (TPB): Lygus lineolaris (Palisot de Beauvois) Selected insecticides were evaluated for control of CA and TPB at the Macon Ridge Research Station (Franklin Parish) near Winnsboro, LA. Cotton seed was planted on May 1 in a Gigger-Gilbert silt loam soil. Plots consisted of four rows (centered on 40 inches) and 50 ft in length. Treatments were arranged in a RCB design with four replications. Insecticides were applied with a tractor-mounted boom and compressed air system calibrated to deliver 10 gpa through 8001 flan fan nozzles (2/row) at 30 psi on 7 Jun. Plant terminals (40/plot) infested with colonies of CA were marked with a yellow snap- on-tag placed which was placed on the main stem immediately prior to application of the insecticides. Insecticide efficacy against CA was measured by harvesting 10 (tagged) plant terminals per plot at 2 DAT, 8 DAT, and 12 DAT. The plant terminals were transported to the laboratory in plastic bags and washed to remove all CA. Numbers of CA in each plot were counted with a binocular scope. Two TPB adults were placed into an 11.5 cm × 11.5 cm nylon mesh (no. 280) bag and caged on each of 10 plant terminals per plot within 2 HAT. Percent mortality of TPB was recorded 4 DAT. All data were subjected to ANOVA and means separated according to DMRT. No rainfall occurred during the field trial. Numbers of CA exceeded 100 insects per plant terminal at test initiation. Numbers declined in all treatments during the evaluation period. All insecticides significantly reduced the number of CA compared to that in the non-treated check at 2 DAT, 8 DAT, and 12 DAT. All insecticide treatments with the exception of Carbine at the lower rate produced TPB mortality levels significantly higher than that in the non-treated check. The higher rates of insecticides generally outperformed the lower rates in reducing numbers of CA and increasing TPB mortality. No phytotoxicity was observed from any of the insecticide treatments. CA/10 plant terminals Treatment/ Rate/acre % TPB mortality formulation lb (AI) 2 DAT 8 DAT 12 DAT 4 DAT Intruder 70WP 0.026 709.5bc 168.0cd 103.3bcd 28.5de Intruder 70WP 0.035 713.8bc 91.0d 52.5bcd 41.5bcd Intruder 70WP 0.05 195.0c 35.5d 37.0cd 55.7bc Centric 40WG 0.031 758.8bc 182.0cd 45.0bcd 62.5ab Centric 40WG 0.05 590.3bc 35.8d 23.3d 79.2a Trimax Pro 4.44SL 0.031 938.0b 420.0b 132.3bc 37.5cd Trimax Pro 4.44SL 0.047 718.5bc 292.5c 142.8b 50.0bc Carbine 50WG 0.044 710.8bc 144.3cd 108.0bcd 8.5ef Carbine 50WG 0.088 724.5bc 54.5d 65.8bcd 25.0de Untreated check --- 1602.3a 848.3a 312.0a 4.2f P > F (ANOVA) < 0.01 < 0.01 < 0.01 < 0.01 Means within columns followed by a common letter are not significantly different (DMRT; P = 0.05).

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2007

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