Planting-Time Versus Cultivation-Time Soil Insecticides for Corn Rootworm Control in Il, 1991

The test plot was planted 2 May in a trap crop field. Selected soil insecticides were applied at planting and first cultivation at Urbana. The experimental design was a randomized complete block with 4 replications. Each treatment consisted of four rows 100 ft long. Rows were 30 inches apart. Counter 15 G and Furadan 15 G applied at planting were metered through Noble units mounted on each of the planter units (John Deere, 7000 series, 4-row Max-Emerge planter). These granules were applied in a 7-inch band ahead of the firming wheels on the planter and were incorporated into the soil. Liquid Furadan 4 F was applied at cultivation time (3 Jun) with equipment calibrated to deliver 30.5 gal/acre at 30 psi and a speed of 2 mph. Spray was applied broadcast through flat fan nozzles (Teejet XRT 8002VS). In 2 of the treatments, the corn was cultivated 1 day after Furadan 4 F was applied. In the other 2 treatments, Furadan 4 F was left on the soil surface and no cultivation was performed.