Control of White Grubs at the Purdue University Agronomy Research Center, W. Lafayette, In, 1994

Abstract

Abstract Treatment plots were 2 × 2 ft, arranged in a RCB design, replicated 5 times. A PVC cylinder (6 inch inside diameter) was buried 4 inches into the soil and projected 1 inch above the soil in the center of each plot. Five third-instar grubs (mixed population consisting of about 90% Japanese beetles and 10% Southern masked chafers) were infested within each cylinder 5 d prior to treatment, 2 Sep. Granular formulations were applied with a homemade salt shaker. All plots received 0.5 inches of irrigation immediately after treatment. Conditions at the time of treatment were: air temp., 21°C; soil temp, at 1 inch, 20°C; thatch depth (natural), 0.13-0.25 inches; soil texture, silt loam; wind speed 3-5 mph. Efficacy was evaluated 30 DAT by extracting the cylinders, separating the soil and grass, and recording the number of live grubs.