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Evaluation of Imidacloprid Seed Treatments for Control of Whiteflies on Fall Cantaloupes, 1995

Evaluation of Imidacloprid Seed Treatments for Control of Whiteflies on Fall Cantaloupes, 1995 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/116/4640052 by DeepDyve user on 21 July 2020 116 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS CANTALOUPE : Cucumis melo L., 'Topmark' J. C. Palumbo, C. H. Mullis, (36E) Sweetpotato whitefly (SPWF), Bemisia tabaci (Genn.) and F. J. Reyes University of Arizona Department of Entomology Yuma Agricultural Center Yuma, AZ 85364 (603) 782-3836 Cantaloupes were direct seeded on 22 Sep into beds spaced 42 inches apart at the University of Arizona, Yuma Valley Agricultural Center, Yuma, AZ. Plots consisted of 2 beds, 150 ft long with a 2 bed buffer between plots. Plot preparation and seasonal maintenance followed local practices. Plots were arranged in a RC B design with 4 replicates. Admire 2F treatments were applied 2 in. sub-seed furrow by injecting the material into the beds with long, narrow shanks in 20 gpa total volume of water before seeding. The Gaucho 480 seed treatments were formulated at rates of 0.25 and 0.50 lbs (AI) of imidacloprid/10 lbs of cantaloupe seed. SPWF densities were estimated by counting the number of eggs and nymphs on 2-cm disk sections taken from each of 10 leaves per plot 7 days after planting (DAP [30 Sep]), 14 DA P (7 Oct), 21 DAP (14 Oct), and 28 DAP (21 Oct). Because of heterogeneity of mean variances, insect data were transformed (log x + 1) prior to analysis. Data were analyzed as a 1-way ANOVA using a protected LSD F test to distinguish treatment mean differences. SPWF populations were moderate throughout the experimental period. At 7 DAP , whitefly numbers did not differ among the treatments and the un­ treated. At 28 DAP, the Gaucho seed treatments alone did not provide control relative to the untreated check. The Gaucho/Admire combinations did not provide any additional whitefly relative to the Admire used alone. Mean no. immature whiteflies/cm 7 DAP 14 DAP 21 DAP 28 DAP Nymph Nymph Treatment Rate Nymph Nymph Egg Egg Egg Egg Admire 2F 0.25 0.5a 0.0a 7.4b 0.0a 6.9b 0.9d 5.8b 1.4c Gaucho 480 0.25 1.0a 0.0a 33.2a 0.0a 35.4a 3.3bc 27.3a 14.2ab Gaucho 480 0.50 0.7a 0.0a 20.5ab 0.0a 40.7a 4.0b 26.7a 15.3ab Gaucho 480 + 0.25 0.5a 0.0a 8.9b 0.0a 13.5b 1.5cd 10.1b 9.2b Admire 2F 0.25 Gaucho 480 + 0.50 0.0a 0.0a 8.6b 0.0a 6.0b 0.5d 5.2b 1.2c Untreated Check 1.2a 0.0a 62.1 0.0a 75.2a 18.8a 36.7a 31.7a Means in a column followed by the same letter are not significantly different. "Rate expressed as lbs (AI)/acre for Admire, and as lbs (AI)/10 lbs. seed for Gaucho. CAULIFLOWER: Brassica oleracea L., 'Ravella' J. C. Palumbo (37E) Cabbage looper (CL); Trichoplusia ni, (Hiibner) University of Arizona Yuma Agric. Center Yuma, Arizona 85364 (602) 782-3836 EFFICACY OF SELECTED INSECTICIDES FOR CONTROL OF CABBAGE LOOPER IN CAULIFLOWER. Cauliflower was direct seeded into on 21 Sep at the Yuma Valley Agricultural Center, Yuma, Az. Each plot consisted of four, 30-ft-long beds spaced 42 inches apart and bor­ dered on each side by two untreated beds. Plots were arranged in a CRB design with 4 replicates. Foliar applications were made on 10 and 14 Oct with a hand-held C0 sprayer operated at 50 psi, delivering 20 gpa. Spreader-sticker (Kinetic) was included in all spray treatments at a rate of 0.125% of the to­ tal volume. Insecticide efficacy was determined by counting the total number of small (1 st and 2nd instars) and large ( > 2nd instar) CL on 5 randomly se­ lected plants replicate. Data were analyzed as a 1-way ANOVA using a protected LSD F test (P = 0.05) to distinguish treatment mean differences. Populations of cabbage looper were not significantly different at the beginning of the test (10 Oct). At 4 days after the first treatment (14 Oct), the numbers of small and large larvae in all insecticide treatments were significantly lower than the untreated check. Larval numbers remained significantly lower 4 days after the second application. All the products provided an equivalent level of cabbage looper control. No phytotoxicity was observed. Mean no. CL larvae/5 plants Oct 10 Oct 14 Oct 18 Treatment Rate" small large small large small large Proclaim 5SG 0.0075 4.75a 1.25a 0.25b 0.0b 0.0b 0.0b Proclaim 0.16EC 0.0075 4.00a 2.25a 0.0b 0.0b 0.0b 0.0b Alert 2SC 0.15 3.25a 3.25a 0.25b 0.0b 0.0b 0.0b Success NAF295 0.09 3.25a 1.75a 0.0b 0.0b 0.0b 0.0b Larvin DF+ Karate 1EC 0.75/0.03 6.00a 2.75a 0.5b 0.25b 0.25b 0.0b Untreated Check 5.57a 0.75a 3.25a 2.75a 4.75a 3.25a Means within a column followed by the same letter are not significantly different (P • 0.05, LS D test). "Rate expressed lbs (AI)/acre. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Evaluation of Imidacloprid Seed Treatments for Control of Whiteflies on Fall Cantaloupes, 1995

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Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.116
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/116/4640052 by DeepDyve user on 21 July 2020 116 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS CANTALOUPE : Cucumis melo L., 'Topmark' J. C. Palumbo, C. H. Mullis, (36E) Sweetpotato whitefly (SPWF), Bemisia tabaci (Genn.) and F. J. Reyes University of Arizona Department of Entomology Yuma Agricultural Center Yuma, AZ 85364 (603) 782-3836 Cantaloupes were direct seeded on 22 Sep into beds spaced 42 inches apart at the University of Arizona, Yuma Valley Agricultural Center, Yuma, AZ. Plots consisted of 2 beds, 150 ft long with a 2 bed buffer between plots. Plot preparation and seasonal maintenance followed local practices. Plots were arranged in a RC B design with 4 replicates. Admire 2F treatments were applied 2 in. sub-seed furrow by injecting the material into the beds with long, narrow shanks in 20 gpa total volume of water before seeding. The Gaucho 480 seed treatments were formulated at rates of 0.25 and 0.50 lbs (AI) of imidacloprid/10 lbs of cantaloupe seed. SPWF densities were estimated by counting the number of eggs and nymphs on 2-cm disk sections taken from each of 10 leaves per plot 7 days after planting (DAP [30 Sep]), 14 DA P (7 Oct), 21 DAP (14 Oct), and 28 DAP (21 Oct). Because of heterogeneity of mean variances, insect data were transformed (log x + 1) prior to analysis. Data were analyzed as a 1-way ANOVA using a protected LSD F test to distinguish treatment mean differences. SPWF populations were moderate throughout the experimental period. At 7 DAP , whitefly numbers did not differ among the treatments and the un­ treated. At 28 DAP, the Gaucho seed treatments alone did not provide control relative to the untreated check. The Gaucho/Admire combinations did not provide any additional whitefly relative to the Admire used alone. Mean no. immature whiteflies/cm 7 DAP 14 DAP 21 DAP 28 DAP Nymph Nymph Treatment Rate Nymph Nymph Egg Egg Egg Egg Admire 2F 0.25 0.5a 0.0a 7.4b 0.0a 6.9b 0.9d 5.8b 1.4c Gaucho 480 0.25 1.0a 0.0a 33.2a 0.0a 35.4a 3.3bc 27.3a 14.2ab Gaucho 480 0.50 0.7a 0.0a 20.5ab 0.0a 40.7a 4.0b 26.7a 15.3ab Gaucho 480 + 0.25 0.5a 0.0a 8.9b 0.0a 13.5b 1.5cd 10.1b 9.2b Admire 2F 0.25 Gaucho 480 + 0.50 0.0a 0.0a 8.6b 0.0a 6.0b 0.5d 5.2b 1.2c Untreated Check 1.2a 0.0a 62.1 0.0a 75.2a 18.8a 36.7a 31.7a Means in a column followed by the same letter are not significantly different. "Rate expressed as lbs (AI)/acre for Admire, and as lbs (AI)/10 lbs. seed for Gaucho. CAULIFLOWER: Brassica oleracea L., 'Ravella' J. C. Palumbo (37E) Cabbage looper (CL); Trichoplusia ni, (Hiibner) University of Arizona Yuma Agric. Center Yuma, Arizona 85364 (602) 782-3836 EFFICACY OF SELECTED INSECTICIDES FOR CONTROL OF CABBAGE LOOPER IN CAULIFLOWER. Cauliflower was direct seeded into on 21 Sep at the Yuma Valley Agricultural Center, Yuma, Az. Each plot consisted of four, 30-ft-long beds spaced 42 inches apart and bor­ dered on each side by two untreated beds. Plots were arranged in a CRB design with 4 replicates. Foliar applications were made on 10 and 14 Oct with a hand-held C0 sprayer operated at 50 psi, delivering 20 gpa. Spreader-sticker (Kinetic) was included in all spray treatments at a rate of 0.125% of the to­ tal volume. Insecticide efficacy was determined by counting the total number of small (1 st and 2nd instars) and large ( > 2nd instar) CL on 5 randomly se­ lected plants replicate. Data were analyzed as a 1-way ANOVA using a protected LSD F test (P = 0.05) to distinguish treatment mean differences. Populations of cabbage looper were not significantly different at the beginning of the test (10 Oct). At 4 days after the first treatment (14 Oct), the numbers of small and large larvae in all insecticide treatments were significantly lower than the untreated check. Larval numbers remained significantly lower 4 days after the second application. All the products provided an equivalent level of cabbage looper control. No phytotoxicity was observed. Mean no. CL larvae/5 plants Oct 10 Oct 14 Oct 18 Treatment Rate" small large small large small large Proclaim 5SG 0.0075 4.75a 1.25a 0.25b 0.0b 0.0b 0.0b Proclaim 0.16EC 0.0075 4.00a 2.25a 0.0b 0.0b 0.0b 0.0b Alert 2SC 0.15 3.25a 3.25a 0.25b 0.0b 0.0b 0.0b Success NAF295 0.09 3.25a 1.75a 0.0b 0.0b 0.0b 0.0b Larvin DF+ Karate 1EC 0.75/0.03 6.00a 2.75a 0.5b 0.25b 0.25b 0.0b Untreated Check 5.57a 0.75a 3.25a 2.75a 4.75a 3.25a Means within a column followed by the same letter are not significantly different (P • 0.05, LS D test). "Rate expressed lbs (AI)/acre.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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