Control of Corn Earworm on Sweet Corn, 1991

Sweet corn was planted on 30 Apr near Georgetown, DE. Two row plots, 20 ft long on 30 inch centers, were replicated 4 times in a randomized complete block design. Treatments were applied with a CO2-pressurized backpack sprayer using two nozzles/row delivering 86.2 gal/acre at 40 psi. Silk sprays were applied on 28 Jun; 2, 8, 11, 15, 18, and 22 Jul. At harvest maturity (24 Jul), all ears from each plot were husked and evaluated for damage as “fresh market” (clean ears, no damage evident) and “processing” (evidence of tip feeding but less than 3.6 cm tip damage). All worms were identified, counted, and recorded.