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INSECTICIDE EFFICACY AGAINST LYGUS ON ALFALFA GROWN FOR SEED IN WASHINGTON STATE, 2006

INSECTICIDE EFFICACY AGAINST LYGUS ON ALFALFA GROWN FOR SEED IN WASHINGTON STATE, 2006 (F5) ALFALFA: Medicago sativa L. INSECTICIDE EFFICACY AGAINST LYGUS ON ALFALFA GROWN FOR SEED IN WASHINGTON STATE, Timothy D. Waters Washington State University Extension Benton Franklin Area th 1016 N. 4 Ave. Pasco, WA 99301 Phone: (509) 545-3511 Fax: (509) 545-2130 E-mail: twaters@wsu.edu Ronald P. Wight Holly J. Fergison Douglas B. Walsh Washington State University Irrigated Agricultural Research and Extension Center 24106 N. Bunn Rd. Prosser, WA 99350 Phone: (509) 786-9287 Fax: (509) 786-9370 Western tarnished plant bug: Lygus hesperus Knight Insecticides were screened for their ability to control Lygus nymphs in alfalfa seed fields. In early spring, field plots were established at Prosser and Othello Washington State. At each location, plots were 18 ft wide and 20 ft in length and treatments were replicated 4 times in a RCB design. Insecticides were applied to mimic grower timing at a pre-bloom and bloom period of the alfalfa. Treatments were applied using a CO powered back pack sprayer equipped with a four nozzle boom using 25 gpa. Five 180° sweeps per plot were used as a means to sample Lygus nymph abundance and efficacy of the insecticides post application. Data were subjected to ANOVA and means were separated from the untreated check using a pairwise t-test (P < 0.05). At the Prosser location during the pre-bloom period, the Baythroid and Capture treatments provided significantly better Lygus control than did the untreated check (Table 1). Moderate levels of control were achieved with the Rimon, Beleaf, and Venom treatments (Table 1). At the Othello location during the pre-bloom period, Rimon, Assail, Baythroid, Dimethoate, Capture, Beleaf, and Venom treatments provided significantly better Lygus control than did the untreated check (Table 1). During the bloom period at the Prosser location, the Rimon, Beleaf, Dibrom, and Assail treatments provided better control than the untreated check (Table 2). At the Othello location during the bloom period none of the treatments controlled Lygus nymphs significantly better than the untreated check (Table 2). Table 1 Mean Lygus nymphs/ 5 sweeps ± std error Rate amt Treatment/formulation product/acre Prosser, WA Othello, WA Rimon 0.83 EC 12 oz 4.75 ± 1.18a 2.00 ± 0.70b Assail 70 WP 0.05 lb 7.50 ± 0.87a 2.25 ± 0.48b Baythroid 1 lb/gallon 2.8 oz 1.00 ± 0.71b 1.50 ± 1.19b Dimethoate 4 EC 1.0 pt 6.00 ± 0.24a 2.75 ± 0.63b Capture 2 EC 6.4 oz 0.25 ± 0.25b 0.25 ± 0.25b Beleaf 25 SG 3 oz 3.25 ± 1.88a 4.75 ± 2.25b Venom 70% SP 3 oz 4.75 ± 1.37a 2.50 ± 0.50b Untreated check - 8.25 ± 1.62a 21.75 ± 6.93a Means followed by the same letter are not significantly different (Pairwise t-test, P < 0.05) Treatments applied pre-bloom. Table 2 Mean Lygus nymphs/ 5 sweeps ± std error Rate amt Treatment/formulation product/acre Prosser, WA Othello, WA Rimon 0.83 EC 12 oz 0.25 ± 0.25b 6.00 ± 0.91a Assail 70 WP 0.05 lb 0.25 ± 0.25b 9.00 ± 3.03a Beleaf 25 SG 3 oz 0.75 ± 0.75b 5.00 ± 2.20a Dibrom 8 E 1 pint 1.00 ± 0.57b 13.00 ± 4.06a Untreated check -- 5.00 ± 0.36a 11.25 ± 3.06a Means followed by the same letter are not significantly different (Pairwise t-test, P < 0.05) Treatments applied during bloom. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

INSECTICIDE EFFICACY AGAINST LYGUS ON ALFALFA GROWN FOR SEED IN WASHINGTON STATE, 2006

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/32.1.F5
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Abstract

(F5) ALFALFA: Medicago sativa L. INSECTICIDE EFFICACY AGAINST LYGUS ON ALFALFA GROWN FOR SEED IN WASHINGTON STATE, Timothy D. Waters Washington State University Extension Benton Franklin Area th 1016 N. 4 Ave. Pasco, WA 99301 Phone: (509) 545-3511 Fax: (509) 545-2130 E-mail: twaters@wsu.edu Ronald P. Wight Holly J. Fergison Douglas B. Walsh Washington State University Irrigated Agricultural Research and Extension Center 24106 N. Bunn Rd. Prosser, WA 99350 Phone: (509) 786-9287 Fax: (509) 786-9370 Western tarnished plant bug: Lygus hesperus Knight Insecticides were screened for their ability to control Lygus nymphs in alfalfa seed fields. In early spring, field plots were established at Prosser and Othello Washington State. At each location, plots were 18 ft wide and 20 ft in length and treatments were replicated 4 times in a RCB design. Insecticides were applied to mimic grower timing at a pre-bloom and bloom period of the alfalfa. Treatments were applied using a CO powered back pack sprayer equipped with a four nozzle boom using 25 gpa. Five 180° sweeps per plot were used as a means to sample Lygus nymph abundance and efficacy of the insecticides post application. Data were subjected to ANOVA and means were separated from the untreated check using a pairwise t-test (P < 0.05). At the Prosser location during the pre-bloom period, the Baythroid and Capture treatments provided significantly better Lygus control than did the untreated check (Table 1). Moderate levels of control were achieved with the Rimon, Beleaf, and Venom treatments (Table 1). At the Othello location during the pre-bloom period, Rimon, Assail, Baythroid, Dimethoate, Capture, Beleaf, and Venom treatments provided significantly better Lygus control than did the untreated check (Table 1). During the bloom period at the Prosser location, the Rimon, Beleaf, Dibrom, and Assail treatments provided better control than the untreated check (Table 2). At the Othello location during the bloom period none of the treatments controlled Lygus nymphs significantly better than the untreated check (Table 2). Table 1 Mean Lygus nymphs/ 5 sweeps ± std error Rate amt Treatment/formulation product/acre Prosser, WA Othello, WA Rimon 0.83 EC 12 oz 4.75 ± 1.18a 2.00 ± 0.70b Assail 70 WP 0.05 lb 7.50 ± 0.87a 2.25 ± 0.48b Baythroid 1 lb/gallon 2.8 oz 1.00 ± 0.71b 1.50 ± 1.19b Dimethoate 4 EC 1.0 pt 6.00 ± 0.24a 2.75 ± 0.63b Capture 2 EC 6.4 oz 0.25 ± 0.25b 0.25 ± 0.25b Beleaf 25 SG 3 oz 3.25 ± 1.88a 4.75 ± 2.25b Venom 70% SP 3 oz 4.75 ± 1.37a 2.50 ± 0.50b Untreated check - 8.25 ± 1.62a 21.75 ± 6.93a Means followed by the same letter are not significantly different (Pairwise t-test, P < 0.05) Treatments applied pre-bloom. Table 2 Mean Lygus nymphs/ 5 sweeps ± std error Rate amt Treatment/formulation product/acre Prosser, WA Othello, WA Rimon 0.83 EC 12 oz 0.25 ± 0.25b 6.00 ± 0.91a Assail 70 WP 0.05 lb 0.25 ± 0.25b 9.00 ± 3.03a Beleaf 25 SG 3 oz 0.75 ± 0.75b 5.00 ± 2.20a Dibrom 8 E 1 pint 1.00 ± 0.57b 13.00 ± 4.06a Untreated check -- 5.00 ± 0.36a 11.25 ± 3.06a Means followed by the same letter are not significantly different (Pairwise t-test, P < 0.05) Treatments applied during bloom.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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