Experiments on Earworm Control on Sweet Corn1

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Abstract
Experiments were conducted in Alabama during 1953, 1954, and 1955 on control of the corn earworm, Heliothis zea, on sweet corn. In the experiments in 1953 and 1954 where sprays were applied at 3-day intervals, the earworm control increased as the rate of DDT per acre per application was increased from 1 to 2.5 lb. Higher rates of DDT did not give corresponding increases in control. The use of 1.75 gal. of mineral oil per acre per application resulted in significant increases in earworm control over no oil; however, when mineral oil was included in the sprays, foliage injury resulted. In 1955, an experiment was conducted to determine the effects of timing and number of applications of DDT-mineral oil emulsion sprays on earworm control when 2 lb. of DDT and 1 gal. of mineral oil were used per acre per application. Sprays applied at 2-day intervals resulted in better earworm control than those applied at 3-day intervals, and sprays begun the 1st day after the 1st silks appeared gave better earworm control than those begun the 2d day after the 1st silks appeared.

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