Egg and Larval Populations of European Corn Borer: In Relation to Time of Planting and Yields of Sweet Corn

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Abstract
As a result mainly of escaping oviposition, plantings of sweet corn made from the 1st week in June to the 1st week in July in 1934, 1935 and 1936, respectively, were satisfactorily protected from infestation by Pyrausta nubilalis, under northern Ohio conditions of single generation infestation. In the same tests plantings made from the first to the last week in May contained 98.1, 86.9, and 96.6% of the number of single-generation larvae observed in 1934, 1935 and 1936, respectively. A partial 2d generation of moths lessened the protection afforded late corn in 1936. The later plantings were more severely infested by the corn ear worm, Heliothis obsoleta, but incident injury to the ears was not materially reflected in the yield of cut corn for canning. In general, favorable yields were obtained in the later plantings.

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