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PREVENTIVE CONTROL OF WHITE GRUBS ON A GOLF COURSE ROUGH, 2008

PREVENTIVE CONTROL OF WHITE GRUBS ON A GOLF COURSE ROUGH, 2008 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.G15 (G15) RYEGRASS (PERENNIAL): Lolium perenne L FESCUE (TALL): Festuca arundinacea Schreb BLUEGRASS (KENTUCKY): Poa pratensis L. David J. Shetlar Department of Entomology The Ohio State University 2501 Carmack Rd. Columbus, OH 43210 Phone: (614) 292-3762 Fax: (614) 292-9783 Email: shetlar.1@osu.edu Jennifer Andon Email: andon.1@osu.edu Japanese beetle (JB): Popillia japonica Newman Northern masked chafer (NMC): Cyclocephala borealis Arrow This study evaluated new insecticides for preventive control of white grubs in turf. The test was located on the irrigated rough, south-center side of fairway #8, at Thorn Apple Golf Club, Gallaway, Ohio. Treatments were applied 22 Apr & 1 Jul to plots 8 ft x 8 ft arranged in a RCB design replicated four times. Liquid treatments were applied using a 3 ft wide CO pressurized sprayer with TeeJet 8004 nozzles at 20 PSI calibrated to deliver 2.0 gal/1000 ft . Plots received daily irrigation. Field conditions at time of 22 Apr applications were: turf – 85% perennial ryegrass, 10 % tall fescue and 10 % Kentucky bluegrass, mowed at 3.0 inch, thatch-0.25-0.5 inch; soil – clay loam, humid, essentially flat, 70°F at 1 inch, 68°F at 3 inches; weather – air temp 72°F, partly cloudy, 0-3 mph wind from north northwest; pests – generally infested in 2006 & 2007. Field conditions at time of 1 Jul applications were: turf – same as above, 86°F at 1 inch, 82°F at 3 inches; weather – air temp 82°F, sunny, 0-3 mph wind from north northwest; pests – moderate adult JB activity noted. Efficacy data were obtained 3 Oct (165 & 95 DAT, respectively) by counting the number of live white grub larvae in one 12 inch wide by 24 inch sod sample (=2 ft ) cut from the exact center of each plot. The sod cutter was set at 1.5-inch depth and the sod was torn apart and underlying soil was raked with metal hand cultivators to expose grubs. ANOVA was performed on untransformed totals per plot and means separated by LSD at α= 0.05. All treatments provided significant control, regardless of application date. Untreated checks had an average of 7.8 white grub larvae per ft , which is considered to be a moderate population. No phytotoxicity was observed after any of the treatments. This research was supported by industry gifts of research funding. Table 1. Treatment/ Rate Appl. % 2a Formulation lb(AI)/acre date Avg/ft control Acelepryn 1.67 SC 0.078 22 Apr 0.0c 100.0 Acelepryn 1.67 SC 0.104 22 Apr 0.0c 100.0 Acelepryn 1.67 SC 0.157 22 Apr 0.0c 100.0 Merit 75 WP 0.30 22 Apr 0.25c 96.8 Meridian 25 WSG 0.26 22 Apr 0.25c 96.8 Acelepryn 1.67 SC 0.078 1 Jul 0.75c 90.3 Acelepryn 1.67 SC 0.104 1 Jul 4.75b 38.7 Acelepryn 1.67 SC 0.157 1 Jul 1.13bc 85.4 Merit 75 WP 0.30 1 Jul 0.0c 100.0 Meridian 25 WSG 0.26 1 Jul 0.38c 95.1 Check --- --- 7.75a --- Combined JB & NMC larvae, untransformed counts analyzed by ANO VA (P<0.001), and means followed by the same letter in a column are not significantly different by LSD at = 0.05. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

PREVENTIVE CONTROL OF WHITE GRUBS ON A GOLF COURSE ROUGH, 2008

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Publisher
Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.4182/amt.2013.G15
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Abstract

Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.G15 (G15) RYEGRASS (PERENNIAL): Lolium perenne L FESCUE (TALL): Festuca arundinacea Schreb BLUEGRASS (KENTUCKY): Poa pratensis L. David J. Shetlar Department of Entomology The Ohio State University 2501 Carmack Rd. Columbus, OH 43210 Phone: (614) 292-3762 Fax: (614) 292-9783 Email: shetlar.1@osu.edu Jennifer Andon Email: andon.1@osu.edu Japanese beetle (JB): Popillia japonica Newman Northern masked chafer (NMC): Cyclocephala borealis Arrow This study evaluated new insecticides for preventive control of white grubs in turf. The test was located on the irrigated rough, south-center side of fairway #8, at Thorn Apple Golf Club, Gallaway, Ohio. Treatments were applied 22 Apr & 1 Jul to plots 8 ft x 8 ft arranged in a RCB design replicated four times. Liquid treatments were applied using a 3 ft wide CO pressurized sprayer with TeeJet 8004 nozzles at 20 PSI calibrated to deliver 2.0 gal/1000 ft . Plots received daily irrigation. Field conditions at time of 22 Apr applications were: turf – 85% perennial ryegrass, 10 % tall fescue and 10 % Kentucky bluegrass, mowed at 3.0 inch, thatch-0.25-0.5 inch; soil – clay loam, humid, essentially flat, 70°F at 1 inch, 68°F at 3 inches; weather – air temp 72°F, partly cloudy, 0-3 mph wind from north northwest; pests – generally infested in 2006 & 2007. Field conditions at time of 1 Jul applications were: turf – same as above, 86°F at 1 inch, 82°F at 3 inches; weather – air temp 82°F, sunny, 0-3 mph wind from north northwest; pests – moderate adult JB activity noted. Efficacy data were obtained 3 Oct (165 & 95 DAT, respectively) by counting the number of live white grub larvae in one 12 inch wide by 24 inch sod sample (=2 ft ) cut from the exact center of each plot. The sod cutter was set at 1.5-inch depth and the sod was torn apart and underlying soil was raked with metal hand cultivators to expose grubs. ANOVA was performed on untransformed totals per plot and means separated by LSD at α= 0.05. All treatments provided significant control, regardless of application date. Untreated checks had an average of 7.8 white grub larvae per ft , which is considered to be a moderate population. No phytotoxicity was observed after any of the treatments. This research was supported by industry gifts of research funding. Table 1. Treatment/ Rate Appl. % 2a Formulation lb(AI)/acre date Avg/ft control Acelepryn 1.67 SC 0.078 22 Apr 0.0c 100.0 Acelepryn 1.67 SC 0.104 22 Apr 0.0c 100.0 Acelepryn 1.67 SC 0.157 22 Apr 0.0c 100.0 Merit 75 WP 0.30 22 Apr 0.25c 96.8 Meridian 25 WSG 0.26 22 Apr 0.25c 96.8 Acelepryn 1.67 SC 0.078 1 Jul 0.75c 90.3 Acelepryn 1.67 SC 0.104 1 Jul 4.75b 38.7 Acelepryn 1.67 SC 0.157 1 Jul 1.13bc 85.4 Merit 75 WP 0.30 1 Jul 0.0c 100.0 Meridian 25 WSG 0.26 1 Jul 0.38c 95.1 Check --- --- 7.75a --- Combined JB & NMC larvae, untransformed counts analyzed by ANO VA (P<0.001), and means followed by the same letter in a column are not significantly different by LSD at = 0.05.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2013

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