Fall Control of White Grubs with Labelled and Experimental Insecticides on a Golf Course, Syracuse, Ny, 1986

Abstract

Abstract Six insecticides were applied to a fairway at Drumlins Country Club, Syracuse, NY on 21 Aug for control of a mixed population of Japanese beetle, and European chafer grubs. The fairway consisted of Kentucky bluegrass (40%), annual bluegrass (45%), bentgrass (10%), and broadleaf weeds (5%). Thatch was minimal (<.25 in.) in all plots. The experimental design was RCB with 4 replications. Individual plots were 10 ft by 10 ft. Granular materials were applied with a precalibrated Gandy 2.5 spreader. Liquid materials were premeasured in the laboratory and applied with 11.4 liters (3 gal) of water through a watering can. All liquid applications were made in 2 directions within each plot. At treatment time the following environmental conditions existed: air temp, 80°F; soil temp (1 inch), 78 F; (3 inch), 75 F; soil pH, 5.57; water pH, 6.78; soil moisture, 26%. Following application of insecticides, the plots were irrigated by sprinkler for 10 min. Posttreatment counts were taken 47 DAT (7 Oct) by cutting a 1 ft by 10 ft strip (2.25 inches deep) lengthwise through each plot with a mechanical sod cutter and examining the sod and underlying soil for grubs. Three 1-ft2 samples of sod were examined in each plot and the no. of surviving grubs counted. Species identifications were made in the field. At this time, Japanese beetles were predominantly third instars, with some second ins tars; all European chafers were third instars.