Evaluation of Non-dormant Alfalfa Cultivars for Resistance to the Egyptian Alfalfa Weevil

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Several non-dormant alfalfa cultivars were evaluated for resistance to Hypera brunneipennis (Boheman) in 1973 and 1974. The winter hardy varieties 'Team' and 'Weevlcheck,' each with moderate resistance to the closely related alfalfa weevil, H. postica (Gyllenhal), but too dormant for maximum production under California conditions, were also included in the tests. 'Moapa,' the most widely grown commercial alfalfa in California, was included as a "susceptible" check.

The non-dolmant cultivar 'UC 73' appeared to contain the greatest amount of resistance to H. brunneipennis among the non-winter hardy entries tested. There was no significant difference in the number of eggs/stem among any of the cultivars but UC 73 had significantly fewer larvae per stem and per sweep than did Moapa. It was also significantly less damaged than Moapa in 2 feeding injury evaluations. UC 73 appeared to contain as high a level of resistance as either Team or Weevlcheck as determined by all evaluation criteria used. There was no significant correlation between stem diam and the number of eggs/stem or the number of egg clusters/stern. Adult ♀ were found to oviposit in stems throughout the size range available within the crop. The relationship between the number of eggs/cluster and increasing stem diam was significant (P = 0.05). A possible antibiosis factor present in UC 73 is also discussed.

Document Type: Research Article

Publication date: February 1, 1976

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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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