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Adult density and oviposition of sorghum midge, Contarinia sorghieola (Coquillett), on a resistant and susceptible sorghum, Sorghum bicolor(L.) Moench hybrid, were assessed under field conditions at College Station, Tex., during 1983 and 1984. Approximately 33% more female midges visited flowering panicles of a susceptible hybrid than those of a resistant hybrid. Moreover, ca. 25% more female midges were collected on flowering panicles of either hybrid that had not previously been infested with midges compared with panicles that had already been exposed to midges. Number of eggs laid in spikelets by 20 caged females per panicle, or by naturally occurring females in the field, was from 4- to 5-fold greater for midges infesting a susceptible than a resistant hybrid. Differences in number of eggs and egg-infested spikelets of the two hybrids were consistent in a free-choice or no-choice situation. These results indicated that nonpreference for oviposition was much more important than nonpreference for adult visitation as a component of nonpreference resistance of the agronomically improved sorghum hybrid AT×2755 × T×2767.
Document Type: Research Article
Publication date: April 1, 1986
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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.