Nature and Distribution of European Corn Borer Feeding Injury on Snap Beans

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Egg masses were placed on snap beans at 7, 14, 21, and 28 days before harvest to determine the nature and distribution of feeding injury by Ostrinia nubilalis (Hübner). Early instars fed first on leaves and then bored into stems and pods as they reached the late 2nd and 3rd instars. About 37% of the stem damage occurred inside the lower portion of the main stem, with the remaining damage distributed among lateral stems. Second and later instars invaded all sizes of pods with a significant preference toward the marketable pods (sieve sizes 3-6). External symptoms, indicating that the pods had been damaged, were not consistently observed. Many marketable pods were completely normal in appearance despite extensive boring, and the only sign of injury was the entry hole. Injury to pin pods (sieve sizes 0-2) invariably was associated with external symptoms, and it is unlikely that these pods will develop to a marketable size. The nature and distribution of feeding injury to pods and stems depended on time of oviposition. When hatching occurred at bloom, ca. half of the surviving larvae invaded pods of all sizes and caused little external evidence of injury by harvest time. When hatching occurred one week or more before bloom, surviving larvae bored primarily into lateral stems; however, ca. 1/3 of these larvae shifted their feeding activity to pods as they became available.

Document Type: Research Article

Publication date: February 1, 1979

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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