Control of Japanese Beetle on a Golf Course Fairway, 1990

Abstract

Abstract Six insecticide treatments were applied on 16 Aug for control of white grubs. The only species present was Japanese beetle, and at treatment time the population consisted of 9.4% 2nd instars and 90.6% 3rd instars. Pretreatment counts of grubs on 2 Aug averaged 14.4/ft2. Experimental plots were arranged in a completely random design, replicated 4 times. Plot size was 10 × 10 ft. Liquid formulations were applied in 2 liters of water with a hand-held sprinkling can; granules were applied with a hand shaker. Treatments were irrigated with 2 liters of water per plot about 1/2 to 1 h after application. Environmental and soil conditions at treatment time were as follows: air temperatv.re, 26°C; RH, 71%; partly cloudy; soil type, silt loam (28.5% sand, 52.5% silt, 19.0% clay); soil moist; soil temperature, 24°C (2 inches); soil pH, 5.9; organic matter, 6.1%; thatch layer 1/4 to 3/8 inches (not compressed). Precipitation over the posttreatment period was 3.35 inches. Four locations on each plot were sampled 28 DAT using a cup changer (4.25 inches diam).