Importance of Time of Application of DDT Sprays in Control of European Corn Borer

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Abstract
Single applications of DDT spray to sweet corn resulted in 85.3% control when applied Aug. 3. Control decreased slightly for earlier treatments of July 24, 29, and considerably when the single treatment was applied on July 19. Cumulative percentage curves of moth emergence and oviposition data are being used as bases for estimating time and percentage levels of borer hatching and for timing applications of insecticides. Percentages of survival of the European corn borer are low until the late whorl stage and then increase until the midtassel stage is reached. Most effective applications of insecticides were those applied at the time of 87-99% of moth emergence and when 13-52% of the eggs had hatched while the corn was in the late whorl or tassel stages.

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