Field Studies of European Corn Borer Biotypes in the Midwest123

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Abstract
F1 generations of the European corn borer, Ostrinia nubilalis (Hũbner), whose parental stocks were collected in west-central Minnesota, central Iowa, and southeastern Missouri, were reared under caged conditions in the field during 1963 and 1964. Egg masses from the parental stocks were produced at the European Corn Borer Research Laboratory in Ankeny, Iowa; shipped to Waseca, Minnesota and Portageville, Missouri; and used at all 3 locations to infest caged WF9 field corn and Seneca Chief sweet corn. Data were taken on daily moth emergence, numbers of diapausing larvae, and feeding habits of the borers. Composite analyses of these data showed statistically significant difference in numbers of moths emerging, numbers of diapausing larvae, and percentages of surviving forms that diapaused among the F1 generations, leading to the conclusion that naturally occuring biotypes of the corn borer exist in the Midwest.