Fall Control of White Grubs with Labeled and Experimental Insecticides on a Golf Course, 1987

Six insecticides were applied to a fairway at Drumlins Country Club, Syracuse, N.Y., on 19 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%). The experimental design was a randomized complete block with 4 replications. Individual plots were 10 × 10 ft. Granular materials were applied with a precalibrated Gandy 2.5 spreader. Liquid materials were premeasured in the laboratory and applied in 2 directions within each plot with 11.4 liters (3 gal) of water through a watering can. At treatment time (19 Aug) the following environmental conditions existed: air temperature, 62°F; soil temperature, 65°F (1 inch), 62°F (3 inches); soil pH 6.9; water pH 7.6; organic matter, 5.4%; soil moisture, 20.0%; soil texture, coarse sand, 15.0%, medium sand, 40.3%, fine sand, 29.4%, very fine sand, 10.0% and silt and clay, 4.7%; thatch was unevenly distributed, but