Field Evaluation of Insecticides for Control of the Green Peach Aphid1 and Alfalfa Looper2 on Head Lettuce3

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Seven insecticides were evaluated in 4 replicated field experiments on head lettuce in the Salinas and Pajaro Valleys of Central California for control of the green peach aphid, Myzus persicae (Sulzer), and the alfalfa looper, A utographa californica (Speyer). Insect populations encountered during- these experiments allowed evaluation of Imidan® (O,O-dimethyl phosphorodithioate S-ester with N- (mercaptomcthyl) phthalimide) and Agritox® (O-ethyl O-2,4,5-trichlorophenyl ethylphosphonothioate) against the alfalfa looper, and oxydemeton-methyl against the green peach aphid. Monitor® (O,S-dimethyl phosphoramidothioate), methomyl, phosalone, and Agrilox controlled the alfalfa looper at rates as low as 0.5 lb active ingredient (AI) per acre, but Imidan was less effective at this rate. Oxydemetonmethyl and Monitor at 0.5 lb/acre and methomyl at 0.75 lb were the most effective insecticides against the green peach aphid. Phosalone when compared at equal rates of 1 lb AI/acre to endosulfan as a standard resulted in similar control of both species.

Document Type: Research Article

Publication date: June 1, 1972

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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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