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GREEN PEACH APHID CONTROL ON CABBAGE WITH NOVEL INSECTICIDES, 2011

GREEN PEACH APHID CONTROL ON CABBAGE WITH NOVEL INSECTICIDES, 2011 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E14 (E14) CABBAGE (HEAD): Brassica oleracea var. capitata ‘Gazelle ’ John C. Palumbo University of Arizona Department of Entomology Yuma Agricultural Center th 6425 W. 8 St. Yuma, Arizona 85364 Phone: (928) 782-3836 Fax: (928) 782-1940 E-mail: jpalumbo@ag.arizona.edu Green peach aphid (GPA): Myzus persicae (Sulzer) The objective of this study was to evaluate the efficacy of several conventional and experimental insecticide compounds against GPA in cabbage tested under desert growing conditions. Cabbage ‘Gazzelle’ was direct seeded into double row beds on 42 inch centers on 2 Nov, 2010. Plots were two beds wide by 45 ft long and bordered by two untreated beds. Stand establishment was achieved using overhead sprinkler irrigation, and irrigated with furrow irrigation thereafter. Four replications of each treatment were arranged in a RCB design. Formulations and rates for each compound are provided in the table. Two foliar sprays were applied on 6 and 23 Mar as a broadcast application delivered through 2 TXVS-18 ConeJet nozzles per bed at 21.5 gpa and 40 psi. Evaluations of GPA populations were assessed by estimating the number of apterous and alate aphids / plant in whole plant, destructive samples. On each sample date, five plants were randomly selected from each plot and placed individually into large 5-gal tubs. Each plant was sampled by visually examining all plant foliage and counting the number of live aphids present. Data were log transform (mean+1) and subjected to ANOVA; means were separated using F-protected LSD (P ≤ 0.05). Actual non-transformed means are presented in the tables. GPA population pressure was heavy during the trial. Pre-spray aphid counts estimated plants were infested with an average of 15.5 GPA / plant. Following the 1st spray application, GPA populations increased quickly in the untreated check. All spray treatments significantly reduced GPA numbers relative to the untreated check for 14 days, with the exception of the Exirel which did not differ from the untreated check at 14 DAT. Following the 2nd application a similar trend was observed, and all spray treatments, except Exirel, significantly reduced GPA numbers relative to the untreated check for 28 DAT. Overall, Movento and Closer provided the most consistent control of GPA, but only Movento provided commercially acceptable control of GPA on cabbage plants at the end of the trial (20 Apr). No phytotoxicity was observed. This research was supported by industry gift(s) of pesticide and/or research funding. Apterous GPA / Plant Treatment/ Rate amt 9-Mar 12-Mar 16-Mar 21-Mar 29-Mar 6-Apr 12-Apr 20-Apr Trial formulation product/acre 3 DAT1 6 DAT1 10 DAT1 14 DAT1 6 DAT2 14 DAT2 20 DAT2 28 DAT2 Avg Movento 2F 5 oz 55.7bcd 9.3de 10.2b 15.2c 5.6c 9.4c 9.3d 34.9e 18.7f Assail 30SG 4 oz 18.4d 29.5cde 18.4b 18.5c 19.0bc 76.8bc 151.1bcd 599.0bcd 116.3d Scorpion 35SL 7.5 oz 105.2b 98.3b 70.4b 33.0bc 45.3b 132.5b 204.8b 878.7b 196.1c Beleaf 50WG 2.8 oz 10.7d 27.1cde 23.8b 24.7c 10.3c 54.8bc 173.9bc 361.6de 85.8de NNI-0101 20SC 3.2 oz 15.3d 17.5cde 18.0b 23.7c 13.2bc 79.5bc 119.4bcd 533.1cd 102.4d Sivanto 240SL 8.5 oz 24.6cd 47.9c 22.0b 19.6c 18.9bc 72.5bc 144.9bcd 708.4bc 132.3d Closer 2SC 2.85 oz 6.6d 6.2e 10.3b 19.0c 5.3c 11.9c 40.3cd 188.7e 36.0ef Exirel 10SE 17 oz 79.8bc 41.4cd 76.3b 52.3ab 29.8bc 245.2a 226.0b 1359.9a 263.8b UTC - 314.0a 292.3a 267.5a 60.8a 190.9a 312.2a 485.2a 1309.3a 404.0a F value 23.65 66.26 8.8 4.38 26.4 7.75 7.8 16.24 31.8 Pr > F <.0001 <.0001 <.0001 0.002 <.0001 <.0001 <.0001 <.0001 <.0001 Means in a column followed by the same letter are not significantly different (P > 0.05, F-protected LSD). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

GREEN PEACH APHID CONTROL ON CABBAGE WITH NOVEL INSECTICIDES, 2011

Arthropod Management Tests , Volume 37 (1) – Jan 1, 2012

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10.4182/amt.2012.E14
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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E14 (E14) CABBAGE (HEAD): Brassica oleracea var. capitata ‘Gazelle ’ John C. Palumbo University of Arizona Department of Entomology Yuma Agricultural Center th 6425 W. 8 St. Yuma, Arizona 85364 Phone: (928) 782-3836 Fax: (928) 782-1940 E-mail: jpalumbo@ag.arizona.edu Green peach aphid (GPA): Myzus persicae (Sulzer) The objective of this study was to evaluate the efficacy of several conventional and experimental insecticide compounds against GPA in cabbage tested under desert growing conditions. Cabbage ‘Gazzelle’ was direct seeded into double row beds on 42 inch centers on 2 Nov, 2010. Plots were two beds wide by 45 ft long and bordered by two untreated beds. Stand establishment was achieved using overhead sprinkler irrigation, and irrigated with furrow irrigation thereafter. Four replications of each treatment were arranged in a RCB design. Formulations and rates for each compound are provided in the table. Two foliar sprays were applied on 6 and 23 Mar as a broadcast application delivered through 2 TXVS-18 ConeJet nozzles per bed at 21.5 gpa and 40 psi. Evaluations of GPA populations were assessed by estimating the number of apterous and alate aphids / plant in whole plant, destructive samples. On each sample date, five plants were randomly selected from each plot and placed individually into large 5-gal tubs. Each plant was sampled by visually examining all plant foliage and counting the number of live aphids present. Data were log transform (mean+1) and subjected to ANOVA; means were separated using F-protected LSD (P ≤ 0.05). Actual non-transformed means are presented in the tables. GPA population pressure was heavy during the trial. Pre-spray aphid counts estimated plants were infested with an average of 15.5 GPA / plant. Following the 1st spray application, GPA populations increased quickly in the untreated check. All spray treatments significantly reduced GPA numbers relative to the untreated check for 14 days, with the exception of the Exirel which did not differ from the untreated check at 14 DAT. Following the 2nd application a similar trend was observed, and all spray treatments, except Exirel, significantly reduced GPA numbers relative to the untreated check for 28 DAT. Overall, Movento and Closer provided the most consistent control of GPA, but only Movento provided commercially acceptable control of GPA on cabbage plants at the end of the trial (20 Apr). No phytotoxicity was observed. This research was supported by industry gift(s) of pesticide and/or research funding. Apterous GPA / Plant Treatment/ Rate amt 9-Mar 12-Mar 16-Mar 21-Mar 29-Mar 6-Apr 12-Apr 20-Apr Trial formulation product/acre 3 DAT1 6 DAT1 10 DAT1 14 DAT1 6 DAT2 14 DAT2 20 DAT2 28 DAT2 Avg Movento 2F 5 oz 55.7bcd 9.3de 10.2b 15.2c 5.6c 9.4c 9.3d 34.9e 18.7f Assail 30SG 4 oz 18.4d 29.5cde 18.4b 18.5c 19.0bc 76.8bc 151.1bcd 599.0bcd 116.3d Scorpion 35SL 7.5 oz 105.2b 98.3b 70.4b 33.0bc 45.3b 132.5b 204.8b 878.7b 196.1c Beleaf 50WG 2.8 oz 10.7d 27.1cde 23.8b 24.7c 10.3c 54.8bc 173.9bc 361.6de 85.8de NNI-0101 20SC 3.2 oz 15.3d 17.5cde 18.0b 23.7c 13.2bc 79.5bc 119.4bcd 533.1cd 102.4d Sivanto 240SL 8.5 oz 24.6cd 47.9c 22.0b 19.6c 18.9bc 72.5bc 144.9bcd 708.4bc 132.3d Closer 2SC 2.85 oz 6.6d 6.2e 10.3b 19.0c 5.3c 11.9c 40.3cd 188.7e 36.0ef Exirel 10SE 17 oz 79.8bc 41.4cd 76.3b 52.3ab 29.8bc 245.2a 226.0b 1359.9a 263.8b UTC - 314.0a 292.3a 267.5a 60.8a 190.9a 312.2a 485.2a 1309.3a 404.0a F value 23.65 66.26 8.8 4.38 26.4 7.75 7.8 16.24 31.8 Pr > F <.0001 <.0001 <.0001 0.002 <.0001 <.0001 <.0001 <.0001 <.0001 Means in a column followed by the same letter are not significantly different (P > 0.05, F-protected LSD).

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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