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(G10) BERMUDAGRASS (COMMON): Cynodon dactylon L. Pers. EFFECTS OF INSECTICIDES AND DELAYED IRRIGATION ON MANAGEMENT OF WHITE GRUBS, 2001 N. R. Walker and T. A. Royer Department of Entomology & Plant Pathology Oklahoma State University Stillwater, OK 74078-3033 E-mail: walkenr@okstate.edu May/June beetle (MJB): Phyllophaga spp. Southern masked chafer (SMC): Cyclocephala lurida Bland Japanese beetle (JB): Popillia japonica Newman Hunting billbug (Billbug): Sphenophorus venatus vestitus Chittenden This study was conducted to evaluate the impact of delayed irrigation on the efficacy of several soil-applied white grub insecticides. Treatments were applied to bermudagrass rough, mowed at 2 inches, at Cimarron Trails Golf Course, Perkins, OK, on 22 Jun to 48-ft plots arranged in a RCB design with five replications. Granular treatments were applied with a Gandy drop spreader and liquid treatments were applied with a CO pressurized (18 psi) wheelbarrow sprayer equipped with TX8008 flat-fan nozzles and calibrated to deliver 2.2 gal/1,000 ft . Soil type was a loamy sand with a pH of 6.3 and 2.89 % organic matter. Thatch accumulation (finger compressed) was 0.75 inches. Weather conditions were as follows: air temperature 73.3 °F, sky clear, and wind 3.5 mph. Irrigation, 0.25 inch, was applied by hand watering and withheld from plots for < 1, 72, or 168 h. One rain event occurred prior to irrigation of the 168-h treatments and plots were covered with sheet plastic prior to and removed immediately after rain. Grub populations were determined on 27 Sep from 6 ft in the center of each plot by removing sod with a mechanical sod cutter and examining the soil to a depth of 3 inches. The data were analyzed using PROC GLM. Insect populations in the untreated plots were below the threshold for bermudagrass. Although there were no statistically significant differences among treatments, irrigation timing did not appear to affect grub control and billbug populations were generally higher in the insecticide treated plots. No phytotoxicity was observed for any treatment.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2002
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