Control of Larvae Infesting Sweet Corn Ears1

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Abstract
Small plots of sweet corn, 0.016 acre each, were sprayed 3 times during a 10-day period beginning at 10% silk, with DDT (1.5 lb./acre) and mineral oil (8 qt./acre) to control earworm, Hellothis zea. Certain plots were treated for control of dusky sap beetle, Carpophilus lugubris, by adding, with the final DDT-mineral oil spray, malathion (0.5 lb./A.), aldrin (1 lb./A.), or diazinon (1.5 lb./A.). Malathion, at the same rate, was used again, seperately, 4 days later. The insecticides, all emuls. cones, were mixed with water to make 25 gal./A. Where diazinon was used 43% of the ears were injured by earworm and 23% by sap beetle; where aldrin was used 53% and 20% were injured; while on unsprayed plots 97% and 100% were injured by these insects, respectively. There were 0.4 sap beetle larvae per ear on the diazinon plots and 0.6 on the aldrin plots, compared with 18 on the unsprayed.

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