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Studies on the Thermal Constants and Seasonal Occurrence of the Seed-Corn Maggot in Wisconsin1

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The thermal constants for various stages of development of the seed-corn maggot, Hylernya cilicrura (Rond.), were investigated. After determining the threshold of development at approximately 50ยบ F., observations on eight insectary cultures yielded the following thermal constants: egg development, 46 day-degrees; larval and pupal development. 236 and 287 day-degrees, respectively. Nineteen insectary cultures indicated 572.5 day-degrees from egg to adult. :Field data indicated 600.7 day-degrees from adult to adult.

The theoretical number of generations during 1957 in Wisconsin was 5.26. Four complete generations and two partial generations were observed in the field. Under field conditions, the preoviposition period was fl to 3 days. The probability of seed-corn maggot estivation during the hotter summer months was low.

Document Type: Research Article

Publication date: October 1, 1958

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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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