Natural Enemies of Some Lygus Bugs1,2

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Known parasites of lygus bugs include several species each of Mymaridae from eggs, Braconidae mainly from nymphs. and Tachinidae from adults. In California, eggs of Lygus Hesperus Knight in alfalfa are commonly attacked by Anaphes ovijentaus (Crosby and Leonard): 50 samples from 14 counties averaged a parasitization of 46.6%. Nymphs of L Hesperus and L. elisus Van Duzee in parts of southern California and Arizona and of L. lineolaris (Palisot de Beauvois) in New Jersey are lightly parasitized by the braconid Euphoriana uniformis Gahan. Parasitization by E. uniformis in 10 local alfalfa fields increased From less than 1% in May to 5.7 and 11.0% in September or October, 1963-64. The related braconid Leiophron(=Euphorus) pallipes Curtis is a common parasite of Lygus spp. and other Miridae in Europe and North America, except in the Southwestern United States. L. pallipes also parasitized L. hesperus and L. elisus in the laboratory, and initial releases were made in several local alfalfa fields. Tachinid parasites were very scarce or absent in all areas studied.

The common hemipterous predators Geocoris spp. and Nabis spp. are frequently parasitized by Tachinidae in southern California, the former by Hyalomya aldrichii Townsend, which also attacks Nysius raphanus Howard, and the latter by Leucostoma simplex (Fallen). Many Geocoris eggs were parasitized by Telenomus sp. near opacus (Howard). Laboratory studies showed that both eggs and nymphs of L. hesperus were readily attacked by Geocoris adults and the nymphs by Nabis adults and nymphs.

Document Type: Research Article

Publication date: August 1, 1966

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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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