Lethal Limits of Low Temperature for the Alfalfa Weevil 10 Illinois1

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The supercooling points of eggs, larvae, pupae, and adults of the eastern strain of Hypera postica (Gyllenhal) were determined in a laboratory study. Measurements based on the supercooling point showed that the egg stage was more cold-hardy than the other stages, and the newly hatched larvae were more cold-hardy than more mature larvae. Adults reared at 72°F showed a definite lowering in the supercooling point with increase in age. Over the same time period adults stored at 30°F showed only a slight lowering in the supercooling point with increase in age. Some observations were made also with adults of the western strain. There was no significant difference in cold-hardiness between adults of the eastern and western strains.

Document Type: Research Article

Publication date: April 1, 1969

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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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