Field Corn, Western Corn Rootworm Control, 1979

Six soil insecticides were evaluated in Franklin County, Idaho. Plots were arranged in randomized complete block design. Corn was planted June 5, in 32 inch rows. All materials were applied at 1 lb ai/acre in a 6 inch band over row. Each treatment was replicated 4 times utilizing plots 3 rows wide × 100 ft. Corn was gravity-irrigated as required and harvested for silage. Insecticide treatments were evaluated, July 25, for root damage by digging 10 equally spaced plants from the center row of each treatment. Roots were evaluated for rootworm feeding damage using a 1-6 damage scale (1 = no discernible damage; 6 = three or more nodes of roots destroyed).