Lygus bugs damage alfalfa grown for seed each year but injurious populations of pea aphids (Macrosiphum pisi (Harris)) occur less often. Experiments designed to determine the joint effect of these insects involved application of insecticides of varying degrees of toxicity to each species, resulting in a range of lygus bug and pea aphid populations. Regression analyses of 3 years' data indicate that yields of alfalfa seed can be expressed by the equation, log10 seed yield=log10 40 lygus bugs + pea aphids, when insect populations are determined by sweep-net samples at weekly intervals during the seed-setting period and populations are given as seasonal means. In these experiments applications of endrin proved to be the most satisfactory for control of both insects and resulted in higher yields than any other treatment.
Document Type: Research Article
Publication date: August 1, 1962
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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.