Corn Ear worm Control in Sweet Corn

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Abstract
Experiments on control of the corn earworm, Heliothis zea (Boddie), in sweet corn were conducted in Alabama in 1956 and 1957. Daily applications of 2.0 pounds per acre of DDT as an emulsion spray during the pre-silk and silking periods resulted in over 99% worm-free ears. Results of the experiments showed that the early part of the silking period was the most critical time for protecting corn against the corn earworm. DDT at 2.5 pounds per acre per application was superior to Phosdrin at 0.25 pound and Chlorthion at 1.0 pound. Thiodan at 2.0 pounds compared favorably with DDT at 2.0 pounds. DDT at 1.0 pound was superior in effectiveness to toxaphene at 2.0 pounds, Hercules AC-528 at 0.5 pound, heptachlor at 0.5 pound, malathion at 0.5 pound, and parathion at 0.25 pound. Sevin (1- naphthyl-N-methyl carbamate) at 2.0 pounds compared favorably with DDT but the formulation used caused severe foliage injury.

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