Effects of Alfalfa Dormancy on Egg and Larval Population Levels of the Alfalfa Weevil (Coleoptera: Curculionidae)

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Abstract:

Two studies were done between 1982 and 1985 to determine the effects of alfalfa dormancy on egg and larval population densities of the alfalfa weevil (Hypera postica (Gyllenhal)). Dormancies of the alfalfa (Medicago sativa L.) entries were estimated based on the amount of growth after the last harvest in September. As alfalfa dormancy was reduced, greater growth in late fall and early spring provided more favorable habitat and abundant ovipositional sites for weevil adults. Egg populations were estimated in January and March, and larval populations were sampled in March and April. Dormant alfalfa entries had significantly less fall growth than those rated as nondormant and had significantly lower egg numbers, as well. Egg population densities averaged 69.0 eggs/0.025 m' in the most dormant and 117.5 eggs/0.025 m' in the nondormant entries. Larval populations averaged 99.0 larvae/25 stems in the most dormant and 120.3 larvae/25 stems in the nondormant entries. Nondormant entries were usually more heavily infested by weevil larvae than their dormant counterparts.

Document Type: Research Article

Publication date: February 1, 1989

More about this publication?
  • 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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