Abstract
Abstract ‘NK-199’ sweet corn was planted in single row plots 25 ft long on May 4 (trial 1) and Jun 4 (trial 2) at our research station near Painter, VA. Treatment plots were replicated 4 times and arranged in a randomized block design. Insecticides were applied to the ear and an area ca 15 inches above and below the ear with a D. B. Smith 5 gal, knapsack, hand-operated, compressed-air sprayer delivering 25 gal water/acre (40 psi) using a spraying systems cone jet Y-8 nozzle. Treatments were initiated in both trials when the corn was ca 10% silking. Trial 1 received treatments on Jul 7, 10, 13, 15, and 17 and was harvested on Jul 21. Damage to ears in trial 1 resulted from feeding by European corn borer larvae. Trial 2 received treatments on Jul 24, 27, 29, 31 and Aug 3 and was harvested on Aug 8. Damage to ears in trial 2 resulted from feeding by the corn earworm. Evaluation criteria for insecticide efficacy was the number of clear ears out of 10 ears examined/replicate.
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