The Effect of Spotted Alfalfa Aphid Protection by Systemic Insecticides and Varieties on Alfalfa Production the Year Following Seedling Protection1

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Yields of six different varieties of alfalfa, each treated at seeding time with granulated Thimet, Bayer 19639 and Bayer 23129 were studied to determine the effects of an infestation by the spotted alfalfa aphid (Therioaphis maculate (Buckton)) in the seedling stage on yield of variety and treatment. The two tolerant varieties, Lahontan and New Mexico 16 were not seriously injured by the aphid attack during the seedling stage. Ranger and African, classed as semi-tolerant, were injured but recovered so that at the end of the first production year they produced as much alfalfa as the best treated plots.

Bayer 19639 applied as a granulated material at seeding time protected non-tolerant varieties from aphid attack in the seedling stage and the first production year's yield was as great as protected tolerant varieties.

Document Type: Research Article

Publication date: August 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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