Foliar Sprays to Control Fall Armyworms in Sweet Corn, 1978

‘N & K 199’ sweet corn was planted, 10-inch spacing in 3-ft rows, on Jun 12’78. Treatment plots were replicated 3 times and arranged in a randomized block design. Each plot consisted of three rows 25 ft long with a single untreated row adjacent to each treatment plot. Insecticides were applied to the ear and to an area about 15 inches above and below the ear with a D. B. Smith 5-gallon, knapsack, hand-operated, compressed-air sprayer at the rate of 25 gal/acre (40 psiT", using a Spraying Systems Cone Jet Y-8 nozzle. Treatments were initiated just prior to first silk on Aug 4 and continued at 2-3 day intervals through Aug 16, a total of 6 applications. Twenty-five ears were harvested from each replicate and checked for fall armyworms. The following categories were selected for evaluation of fall armyworm injury: 1) Clean - no evidence of earworm; 2) Slight -confined to extreme tip of ear; 3) Medium - injury less than 1.5 inches below tip; ear could be clipped; and 4) Severe - damage well below ear tip and of such nature that ear could not be clipped or salvaged for use.