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FIELD EFFICACY OF SEVERAL INSECTICIDES AGAINST FIRST GENERATION ANNUAL BLUEGRASS WEEVIL, GOLF COURSE FAIRWAY, 2011

FIELD EFFICACY OF SEVERAL INSECTICIDES AGAINST FIRST GENERATION ANNUAL BLUEGRASS WEEVIL, GOLF... Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G15 (G15) BLUEGRASS (ANNUAL): Poa annua L. BENTGRASS (CREEPING): Agrostis palustrus L. FIELD EFFICACY OF SEVERAL INSECTICIDES AGAINST FIRST GENERATION ANNUAL BLUEGRASS WEEVIL, GOLF COURSE FAIRWAY, 2011 P. J. Vittum Department of Plant, Soil, and Insect Sciences 104 Agricultural Engineering Building 250 Natural Resources Road University of Massachusetts-Amherst Amherst, MA 01003 Tel: 413-545-0268 Fax: 413-545-5858 E-mail: pvittum@ent.umass.edu L. J. Brocklesby E-mail: ljbrock@psis.umass.edu Annual bluegrass weevil (ABW): Listronotus maculicollis (Dietz) Seven products (Acelepryn, Aloft, Arena, two formulations of Dylox, Talstar, and Zylam) were tested for field efficacy against ABW on golf course fairway turf in spring 2011. Each product was applied a single time, on 10 May or 1 Jun 2011. The test was conducted at Tumble Brook Country Club, Bloomfield, CT. Treatment plots were 5 ft by 5 ft, replicated 4 times, and arranged in a CRB design. All insecticide treatments were applied with a watering can (1.5 qt water per plot), with half the material applied in one direction and the remainder applied in a perpendicular direction. Plots were irrigated with 0.05 inches water within 30 min after application on 10 May, but not on 1 June. The conditions at the time of application were as follows: (10 May): air temp, 68º F; soil temp (at 2 inches), 63º F; water pH, 6.3; light showers, calm; Forsythia “half green, half gold”; (1 Jun): air temp, 78° F; soil temp (at 2 inches), 74° F; hazy, hot, and humid; light breeze (<5 mph); rhododendron just past peak bloom; thatch ca. 0.5 inch thick with moderate density. All plots were sampled 13 Jun to determine the efficacy of the compounds against larvae of the first generation of the ABW. Product efficacy was evaluated by removing eight 1.85-inch diameter cores from near the center of each plot, transporting the cores to our laboratory in Amherst, MA, and using a saline solution to extract all stages except eggs. Each core was recorded separately, and all counts were included in statistical analyses (Fisher Protected LSD; 0.05 significance level; F = 9.61; P < 0.0001). “Larvae” per core actually reflects counts of all larvae and pupae. Adults were not included in the analysis because of their mobility. 2 2 There were about 45 larvae per ft in the untreated checks, within the accepted spring action level of 30 to 80 larvae per ft . There was no significant difference between any of the treatments, which we attribute to heavy rains that occurred between the first application (9 May) and sampling. The plot was on a slight slope, and we believe some of the larvae were physically moved two to five feet when rain puddles occurred during the trial period. This research was supported by industry gifts of products and research funding. lb AI Mean larvae Mean larvae per cent Treatment per acre Date per plug s.e. per sq. ft. control Check --- --- 0.91 NS 1.5104 46.3 --- Acelepryn 1.67SL 0.261 10 May 0.50 0.8800 25.4 45 Arena 50WDG 0.3 10 May 0.34 0.5453 17.3 63 Dylox 420SL 8.2 1 June 0.31 0.6444 15.8 66 Aloft SC (14.5 fl oz) 10 May 1.25 2.7357 63.6 0 Dylox 6.2G 8.2 1 June 0.47 0.8793 23.9 48 Talstar 0.169 10 May 0.19 0.3966 9.7 79 Zylam 20SG 0.36 10 May 0.06 0.2459 3.0 94 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

FIELD EFFICACY OF SEVERAL INSECTICIDES AGAINST FIRST GENERATION ANNUAL BLUEGRASS WEEVIL, GOLF COURSE FAIRWAY, 2011

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Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G15 (G15) BLUEGRASS (ANNUAL): Poa annua L. BENTGRASS (CREEPING): Agrostis palustrus L. FIELD EFFICACY OF SEVERAL INSECTICIDES AGAINST FIRST GENERATION ANNUAL BLUEGRASS WEEVIL, GOLF COURSE FAIRWAY, 2011 P. J. Vittum Department of Plant, Soil, and Insect Sciences 104 Agricultural Engineering Building 250 Natural Resources Road University of Massachusetts-Amherst Amherst, MA 01003 Tel: 413-545-0268 Fax: 413-545-5858 E-mail: pvittum@ent.umass.edu L. J. Brocklesby E-mail: ljbrock@psis.umass.edu Annual bluegrass weevil (ABW): Listronotus maculicollis (Dietz) Seven products (Acelepryn, Aloft, Arena, two formulations of Dylox, Talstar, and Zylam) were tested for field efficacy against ABW on golf course fairway turf in spring 2011. Each product was applied a single time, on 10 May or 1 Jun 2011. The test was conducted at Tumble Brook Country Club, Bloomfield, CT. Treatment plots were 5 ft by 5 ft, replicated 4 times, and arranged in a CRB design. All insecticide treatments were applied with a watering can (1.5 qt water per plot), with half the material applied in one direction and the remainder applied in a perpendicular direction. Plots were irrigated with 0.05 inches water within 30 min after application on 10 May, but not on 1 June. The conditions at the time of application were as follows: (10 May): air temp, 68º F; soil temp (at 2 inches), 63º F; water pH, 6.3; light showers, calm; Forsythia “half green, half gold”; (1 Jun): air temp, 78° F; soil temp (at 2 inches), 74° F; hazy, hot, and humid; light breeze (<5 mph); rhododendron just past peak bloom; thatch ca. 0.5 inch thick with moderate density. All plots were sampled 13 Jun to determine the efficacy of the compounds against larvae of the first generation of the ABW. Product efficacy was evaluated by removing eight 1.85-inch diameter cores from near the center of each plot, transporting the cores to our laboratory in Amherst, MA, and using a saline solution to extract all stages except eggs. Each core was recorded separately, and all counts were included in statistical analyses (Fisher Protected LSD; 0.05 significance level; F = 9.61; P < 0.0001). “Larvae” per core actually reflects counts of all larvae and pupae. Adults were not included in the analysis because of their mobility. 2 2 There were about 45 larvae per ft in the untreated checks, within the accepted spring action level of 30 to 80 larvae per ft . There was no significant difference between any of the treatments, which we attribute to heavy rains that occurred between the first application (9 May) and sampling. The plot was on a slight slope, and we believe some of the larvae were physically moved two to five feet when rain puddles occurred during the trial period. This research was supported by industry gifts of products and research funding. lb AI Mean larvae Mean larvae per cent Treatment per acre Date per plug s.e. per sq. ft. control Check --- --- 0.91 NS 1.5104 46.3 --- Acelepryn 1.67SL 0.261 10 May 0.50 0.8800 25.4 45 Arena 50WDG 0.3 10 May 0.34 0.5453 17.3 63 Dylox 420SL 8.2 1 June 0.31 0.6444 15.8 66 Aloft SC (14.5 fl oz) 10 May 1.25 2.7357 63.6 0 Dylox 6.2G 8.2 1 June 0.47 0.8793 23.9 48 Talstar 0.169 10 May 0.19 0.3966 9.7 79 Zylam 20SG 0.36 10 May 0.06 0.2459 3.0 94

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2012

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