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APHID CONTROL ON HEAD LETTUCE USING IMIDACLOPRID AND FOLIAR INSECTICIDES, 2012

APHID CONTROL ON HEAD LETTUCE USING IMIDACLOPRID AND FOLIAR INSECTICIDES, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E30 (E30) LETTUCE (HEAD): Lactuca sativa L. var. capitata L., ‘Winter King’ APHID CONTROL ON HEAD LETTUCE USING IMIDACLOPRID AND FOLIAR INSECTICIDES, 2012 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: Myzus persicae (Sulzer) Aphid: Acyrthosiphon lactucae (Passerini) The objective of these studies was to evaluate control of aphids using either foliar-applied insecticides, soil-applied insecticides or a combination of both on spring head lettuce under desert growing conditions. Head lettuce 'Winter King' was direct seeded into double row beds on 42 inch centers on 7 Dec, 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 tables. Foliar sprays were applied on 12 and 28 Feb with a CO operated boom sprayer at 40 psi and 28 gpa. A broadcast application was delivered through 2 TXVS-18 ConeJet nozzles per bed. An adjuvant, Dyne-Amic (Helena Chemical Co.), was applied at 0.25% vol/vol to all treatments. Aphid populations were assessed by estimating the number of aphids / plant in whole plant, destructive samples. On each sampling date, 5 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 apterous aphids present. Data were log transform (mean+1) and subjected to ANOVA; means were separated using a F-protected LSD (P ≤ 0.05). Actual non-transformed means are presented in the tables. The aphid complex consisted predominantly of A. lactucae with a few green peach aphids present at harvest. Aphid pressure was light early in the trial, but reached economic levels in the untreated check 14 days prior to harvest (Table 1). Depending on aphid pressure during the spring growing season, imidacloprid soil applications applied at 7 oz/acre may or may not provide season long control of aphids. In this trial, all the insecticide treatment combination significantly reduced aphid contamination at harvest, but lettuce treated with Admire Pro and without additional foliar sprays had unacceptable aphid contamination based on commercial market standards (Table 2). Furthermore, two applications of Closer and Movento applied to non-Admire Pro treated lettuce reduced aphid contamination to very low levels. However, but the most consistent treatments were the Admire Pro at-plant treatment followed by a single foliar application of Closer 12 days before harvest. This research was supported by industry gift(s). 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E30 Table 1. Mean Aphids / Plant Soil Treatment/ Rate amt Foliar Treatment/ Rate amt formulation product/acre formulation product/acre 17-Feb 24-Feb 2-Mar 15-Mar 29-Mar Admire Pro 7 oz --- 1.5a 3.1a 3.1a 1.9a 2.8b Admire Pro 7 oz Movento 2SC 5 oz 1.4a 4.9a 3.2a 2.1a 1.9b Admire Pro 7 oz Closer 2SC 2.8 oz 1.6a 5.0a 2.9ab 1.5a 2.3b --- Movento 2SC 5 oz 1.4a 4.3a 1.2b 1.5a 6.0a --- Closer 2SC 2.8 oz 1.5a 4.4a 1.1b 2.7a 5.9a Untreated --- Untreated --- 1.4a 4.3a 5.7a 3.4a 11.2a Means in a column followed by the same letter are not significantly different (P > 0.05, F-protected LSD). Table 2. % Heads % Heads Foliar Mean infested infested Soil Treatment/ Rate amt Treatment/ Rate amt Aphids per with 1 or > with 10 or > formulation product/acre formulation product/acre Head aphids aphids Admire Pro 7 oz --- 11.7b 64.3b 60.7b Admire Pro 7 oz Movento 2SC 5 oz 1.9cd 29.3c 21.4c Admire Pro 7 oz Closer 2SC 2.8 oz 0.9d 14.3d 10.7c --- Movento 2SC 5 oz 3.4cd 64.3b 28.6c --- Closer 2SC 2.8 oz 4.6bc 60.7dc 28.6c Untreated --- Untreated --- 37.9a 92.9a 92.9a 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

APHID CONTROL ON HEAD LETTUCE USING IMIDACLOPRID AND FOLIAR INSECTICIDES, 2012

Arthropod Management Tests , Volume 38 (1) – Jan 1, 2013

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Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E30 (E30) LETTUCE (HEAD): Lactuca sativa L. var. capitata L., ‘Winter King’ APHID CONTROL ON HEAD LETTUCE USING IMIDACLOPRID AND FOLIAR INSECTICIDES, 2012 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: Myzus persicae (Sulzer) Aphid: Acyrthosiphon lactucae (Passerini) The objective of these studies was to evaluate control of aphids using either foliar-applied insecticides, soil-applied insecticides or a combination of both on spring head lettuce under desert growing conditions. Head lettuce 'Winter King' was direct seeded into double row beds on 42 inch centers on 7 Dec, 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 tables. Foliar sprays were applied on 12 and 28 Feb with a CO operated boom sprayer at 40 psi and 28 gpa. A broadcast application was delivered through 2 TXVS-18 ConeJet nozzles per bed. An adjuvant, Dyne-Amic (Helena Chemical Co.), was applied at 0.25% vol/vol to all treatments. Aphid populations were assessed by estimating the number of aphids / plant in whole plant, destructive samples. On each sampling date, 5 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 apterous aphids present. Data were log transform (mean+1) and subjected to ANOVA; means were separated using a F-protected LSD (P ≤ 0.05). Actual non-transformed means are presented in the tables. The aphid complex consisted predominantly of A. lactucae with a few green peach aphids present at harvest. Aphid pressure was light early in the trial, but reached economic levels in the untreated check 14 days prior to harvest (Table 1). Depending on aphid pressure during the spring growing season, imidacloprid soil applications applied at 7 oz/acre may or may not provide season long control of aphids. In this trial, all the insecticide treatment combination significantly reduced aphid contamination at harvest, but lettuce treated with Admire Pro and without additional foliar sprays had unacceptable aphid contamination based on commercial market standards (Table 2). Furthermore, two applications of Closer and Movento applied to non-Admire Pro treated lettuce reduced aphid contamination to very low levels. However, but the most consistent treatments were the Admire Pro at-plant treatment followed by a single foliar application of Closer 12 days before harvest. This research was supported by industry gift(s). 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E30 Table 1. Mean Aphids / Plant Soil Treatment/ Rate amt Foliar Treatment/ Rate amt formulation product/acre formulation product/acre 17-Feb 24-Feb 2-Mar 15-Mar 29-Mar Admire Pro 7 oz --- 1.5a 3.1a 3.1a 1.9a 2.8b Admire Pro 7 oz Movento 2SC 5 oz 1.4a 4.9a 3.2a 2.1a 1.9b Admire Pro 7 oz Closer 2SC 2.8 oz 1.6a 5.0a 2.9ab 1.5a 2.3b --- Movento 2SC 5 oz 1.4a 4.3a 1.2b 1.5a 6.0a --- Closer 2SC 2.8 oz 1.5a 4.4a 1.1b 2.7a 5.9a Untreated --- Untreated --- 1.4a 4.3a 5.7a 3.4a 11.2a Means in a column followed by the same letter are not significantly different (P > 0.05, F-protected LSD). Table 2. % Heads % Heads Foliar Mean infested infested Soil Treatment/ Rate amt Treatment/ Rate amt Aphids per with 1 or > with 10 or > formulation product/acre formulation product/acre Head aphids aphids Admire Pro 7 oz --- 11.7b 64.3b 60.7b Admire Pro 7 oz Movento 2SC 5 oz 1.9cd 29.3c 21.4c Admire Pro 7 oz Closer 2SC 2.8 oz 0.9d 14.3d 10.7c --- Movento 2SC 5 oz 3.4cd 64.3b 28.6c --- Closer 2SC 2.8 oz 4.6bc 60.7dc 28.6c Untreated --- Untreated --- 37.9a 92.9a 92.9a 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, 2013

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