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A Comparison of Merck Materials and a Standard Insecticide for Control of Lepidoptera on Cabbage, 1996

A Comparison of Merck Materials and a Standard Insecticide for Control of Lepidoptera on Cabbage,... Downloaded from https://academic.oup.com/amt/article-abstract/22/1/108/4640014 by DeepDyve user on 21 July 2020 108 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS CABBAGE: Brassica oleracea capitata L. 'Cheers' A. M. Shelton and W. T. Wilsey (28E) Diamondback moth (DBM); Plutella xylostella (L.) Department of Entomology Cabbage looper (CL); Trichoplusia ni (Hiibner) NYS Agric. Expt. Station Imported cabbageworm (ICW); Artogeia rapae (L.) Geneva, NY 14456 (315)787-235 2 A COMPARISON OF MERCK MATERIALS AND A STANDARD INSECTICIDE FOR CONTROL OF LEPIDOPTERA ON CAB­ BAGE , 1996: Cabbage was transplanted on 12 Ju n at the Vegetable Crops Research Farm near Geneva, NY . Plots consisted of two 10-ft rows on 36-inch centers with 18-inch plant spacing. Treatments were replicated 4 times (3 times for 24 Oct trial) in a RCB design. A backpack sprayer with a one-row boom, having 3 nozzles per row with HC 12 hollow cone tips and delivering 30 gpa.at 40 psi and 2 mph, was used to apply a single application of each treatment. Silwet L-77 sticker-spreader was applied at 0.1 % v/v with all treatments. Two trials were conducted. The first trial utilized only natural populations of Lepidoptera. Treatments were first applied on 25 Jul with evaluations made on 2 Aug. Evaluations were made by selecting three plants per plot, removing all leaves, and counting the number of live larvae. In a separate field, a second trial was conducted. In the second trial, to insure adequate populations of cabbage loopers, three plants per treatment were inoculated on 16 Oct with 15 third instar larvae from a laboratory reared colony. Larvae were allowed to acclimate before treatments were applied on 17 Oct and evaluations were made on 24 Oct. Evaluations were made by selecting the three inoculated plants per plot, removing all leaves, and counting the number of live lar­ vae. A two-way ANOVA was used for analysis of Lepidoptera using replicate totals. In the first trial, all treatments against natural DBM and ICW populations had significantly fewer insects than the untreated check and there were no significant differences between treatments. In the second trial, all treatments against CL had significantly fewer insects than the untreated check. Be­ tween treatments, Ambush at 0.1 lb (AI)/acre had significantly fewer cabbage loopers than either treatment of Proclaim. There were no significant differ­ ences between Proclaim EC and Proclaim SG at the same rate; i.e., 0.0075 lb. (AI)/acre. No phytotoxicity was observed in any of the treatments of either trial. SEP 2 TRIAL Mean no. larvae per 3 plants Treatment Rate/acre DB M ICW CL Proclaim 0.16 EC 0.0075 lb (AI) 0.25 0.25 0.00 Proclaim 5% SG 0.0075 lb (AI) 0.50 0.00 0.00 Ambush 2 EC 0.10 lb (AI) 0.00 0.00 0.00 Untreated Check 0.00 8.50 7.00 LSD (P = 0.05) 1.51 1.47 OCT. 24 TRIAL Mean no. larvae per 3 plants Treatment Rate/acre CL Proclaim 0.16 EC 0.0075 lb (AI) 11.67 Proclaim 5% SG 0.0075 lb (AI) 10.67 Ambush 2 EC 0.10 lb (AI) 0.00 Untreated Check 41.00 LSD (P = 0.05) 5.07 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

A Comparison of Merck Materials and a Standard Insecticide for Control of Lepidoptera on Cabbage, 1996

Arthropod Management Tests , Volume 22 (1) – Jan 1, 1997

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Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.108
Publisher site
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/108/4640014 by DeepDyve user on 21 July 2020 108 Arthropod Management Tests, Vol. 22 E: VEGETABLE CROPS CABBAGE: Brassica oleracea capitata L. 'Cheers' A. M. Shelton and W. T. Wilsey (28E) Diamondback moth (DBM); Plutella xylostella (L.) Department of Entomology Cabbage looper (CL); Trichoplusia ni (Hiibner) NYS Agric. Expt. Station Imported cabbageworm (ICW); Artogeia rapae (L.) Geneva, NY 14456 (315)787-235 2 A COMPARISON OF MERCK MATERIALS AND A STANDARD INSECTICIDE FOR CONTROL OF LEPIDOPTERA ON CAB­ BAGE , 1996: Cabbage was transplanted on 12 Ju n at the Vegetable Crops Research Farm near Geneva, NY . Plots consisted of two 10-ft rows on 36-inch centers with 18-inch plant spacing. Treatments were replicated 4 times (3 times for 24 Oct trial) in a RCB design. A backpack sprayer with a one-row boom, having 3 nozzles per row with HC 12 hollow cone tips and delivering 30 gpa.at 40 psi and 2 mph, was used to apply a single application of each treatment. Silwet L-77 sticker-spreader was applied at 0.1 % v/v with all treatments. Two trials were conducted. The first trial utilized only natural populations of Lepidoptera. Treatments were first applied on 25 Jul with evaluations made on 2 Aug. Evaluations were made by selecting three plants per plot, removing all leaves, and counting the number of live larvae. In a separate field, a second trial was conducted. In the second trial, to insure adequate populations of cabbage loopers, three plants per treatment were inoculated on 16 Oct with 15 third instar larvae from a laboratory reared colony. Larvae were allowed to acclimate before treatments were applied on 17 Oct and evaluations were made on 24 Oct. Evaluations were made by selecting the three inoculated plants per plot, removing all leaves, and counting the number of live lar­ vae. A two-way ANOVA was used for analysis of Lepidoptera using replicate totals. In the first trial, all treatments against natural DBM and ICW populations had significantly fewer insects than the untreated check and there were no significant differences between treatments. In the second trial, all treatments against CL had significantly fewer insects than the untreated check. Be­ tween treatments, Ambush at 0.1 lb (AI)/acre had significantly fewer cabbage loopers than either treatment of Proclaim. There were no significant differ­ ences between Proclaim EC and Proclaim SG at the same rate; i.e., 0.0075 lb. (AI)/acre. No phytotoxicity was observed in any of the treatments of either trial. SEP 2 TRIAL Mean no. larvae per 3 plants Treatment Rate/acre DB M ICW CL Proclaim 0.16 EC 0.0075 lb (AI) 0.25 0.25 0.00 Proclaim 5% SG 0.0075 lb (AI) 0.50 0.00 0.00 Ambush 2 EC 0.10 lb (AI) 0.00 0.00 0.00 Untreated Check 0.00 8.50 7.00 LSD (P = 0.05) 1.51 1.47 OCT. 24 TRIAL Mean no. larvae per 3 plants Treatment Rate/acre CL Proclaim 0.16 EC 0.0075 lb (AI) 11.67 Proclaim 5% SG 0.0075 lb (AI) 10.67 Ambush 2 EC 0.10 lb (AI) 0.00 Untreated Check 41.00 LSD (P = 0.05) 5.07

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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