Observations on the European Corn Borer and the Corn Earworm Infesting Early-Season Plantings of Country Gentleman Sweet Corn1

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Abstract
Prior to 1954 very little Country Gentleman corn was planted in Illinois before May 20 because the principal variety, Illinois 13, was known to germinate poorly in cool or cold soils. This resulted in the corn silking and maturing late in the canning season during the period of greatest egg deposition by the Pyrausta nubilalis and Heliothis zea. During 1954 and 1955, canning companies co-operated in planting Country Gentleman corn on sandy soils in their area well in advance of the May 20th date. In general, these plantings of corn were too young for the lst generation borer and too mature for the 2d generation borer and the corn earworm. Results with insecticides were good because heavy infestations of either pest did not occur in the early planted fields.

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