The Alfalfa Weevil Parasite Bathyplectes curculionis in Illinois and Notes on its Dispersal

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Abstract:

During May and June of 1964, while conducting a survey to determine the Illinois distribution limits for the alfalfa weevil, Hypera postica (Gyllenhal), more than 900 alfalfa weevil larvae were collected from 6 counties in the southern portion of the State. These larvae were reared individually in shell vials with the hope of detecting the presence of any native parasites in the infested area. As a result of these rearings 20 parasite cocoons were obtained from the larvae collected during this period (Table 1). All the parasite cocoons were dark brown with a white or grayish band encircling the middle and appeared typical of the diapause cocoons produced by most species of the ichneumonid genus Bathyplectes. After it became evident that these parasites were in diapause, the cocoons were held at 75°F until August 3, 1964, and then placed in an incubator at 45°F. After 3 months the parasite cocoons were returned to 75°F and adult emergence occurred about 2 weeks later. The adult parasites were identified as Bathyplectes curculionis (Thompson) by Miss L. M. Walkley of the Entomology Research Division, USDA.

Document Type: Research Article

Publication date: December 1, 1965

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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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