Fall Control of White Grubs with Insecticides on a Golf Course at Syracuse, Ny, September, 1986

Abstract

Abstract Three insecticides were applied to a fairway at Drumlins Country Club, Syracuse, NY on 15 Sep for control of a mixed population of Japanese beetle, and European chafer grubs. The fairway consisted of Kentucky bluegrass (50%), annual bluegrass (45%), 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: soil temp (1 inch), 62°F; (3 inch), 62; water pH, 6.78; soil moisture, 21%. Posttreatment counts were taken 31 DAT (16 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 were counted. Species identification were made in the field. At this time most Japanese beetles were third instars, with some second and first instars; all European chafers were third instars.