Laboratory Studies on Selective Aphicides Favoring Natural Enemies of the Spotted Alfalfa Aphid1

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The failure of parathion to give persisting control of the spotted alfalfa aphid, Therioaphis maculata (Buck.), in southern California despite- satisfactory initial kill is believed clue to the destruction of natural ,enemies. Late larval and pupal stages of internal parasites of T. maculata are not all killed by relatively high dosages of the most toxic aphicides tested, but those materials having the most persistent residues destroy the adults upon emergence. Comparison of the toxicities of 13 aphicides to T. maculata adults and to Hippodamia adults and larvae show that at the LD-95 for the spotted alfalfa aphid, conservation of coccinellids is highest with nicotine sulphate, and decreases in degree with schradan, demeton, Trithion, Phosdrin, pyrethrurn extract, TEPP, lindane, BHC. toxaphene, parathion, malathion. and rote none. Demeton, because of its high aphid toxicity and favorable effect on coccinellids and parasites, is suggested as the most practical material for integrated chemincal and biological control of T. maculata.

Document Type: Research Article

Publication date: June 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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