Three sorghum cultivars resistant to green bug biotype I (Cargill 607E, PI550607, and PI550610) were evaluated to determine their mechanisms of resistance. Results indicated antibiosis and antixenosis were mechanisms of resistance in the 3 sorghum cultivars. PI550610 had the highest level of antibiosis, although this level was not significantly different from t11atin PI550607. Higher levels of tolerance in the biotype I-resistant cultivars, compared with the susceptible checks, were not detected. Proper use of these new sources of resistance will be important to reduce selection pressure for new green bug biotypes. Sorghum cultivars exhibiting higher levels of tolerance should continue to be the focus of plant breeders because this mechanism may eliminate selection for new biotypes.
Document Type: Research Article
Publication date: April 1, 1996
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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.