Efficacy of Insecticides on Black Cutworm in Bentgrass, 1992:

Tests were conducted at the Purdue University Agronomy Research Center, W. Lafayette, IN. All treatments were applied to a 4 ft2 area, replicated five times in RCB design. Dispersible form were applied through a sprinkling can in one gal of water. Granular form were applied using a homemade sale shaker and watered in with one gal of water. Galvanized steel circular barriers (60 inch circumference) were buried 1 inch into the soil and projected 2 inches above the soil in the center of each plot. Five fourth-instar black cutworms were infested within each barrier 2 d prior to treatment, 23 Jun. Netting material was clipped to the top of each barrier to prevent bird predation. Conditions at the time of treatment were: air temp, 32°C; soil temp at 1 inch, 20°C; thatch depth (natural), 0.25-0.38 inches; soil texture, silt loam; soil moisture 43%; wind speed 0-3 mph. Efficacy was evaluated 6 DAT by applying 1 T of Joy dishwashing liquid/gal of water in each arena and recording the number of cutworms that emerged from the turf.