Corn, Black Cutworm Control, 1977

Field corn was planted in 30 in. rows at Wooster (Wayne County) Ohio on the date given with each experiment. Experimental designs were randomized complete blocks with three replicates. Plots consisted of two rows each 5 ft long enclosed by aluminum barriers 6 inches in height. Each 4 x 5 ft plot contained 12 corn plants with 2 fully emerged leaves and was infested with 12 fifth stage A. ipsilon larvae (lab-reared on artificial diet from eggs collected from wild moths). The larvae were induced to burrow into the soil the morning of treatment and no cutting occurred before the insecticidal treatments were applied in late afternoon. Bait and granular treatments were applied by hand in a 6 in. band over the row. Liquid treatments were sprayed in ca. 18.5 gal /acre in a 6 in. band over the row with a CO2 powered constant pressure sprayer at 20 psi. Soil type was Wooster silt loam; pH 6.8; organic matter 2.1%. Plots were checked daily for 16 days for plants cut below the whorl or tunnelled. No cutting occurred the last 4 days of observation.