Abstract
Three no-choice methods were used to screen 8 genotypes of Upland cotton, Gossypium hirsutum L., for ovipositional nonpreference by Lygus Hesperus Knight. Whole plants, bouquets of excised leaves, and intact mainstem terminals of field-growing plants were exposed to females for oviposition. With each method, 247-1-6 had significantly fewer lygus bug eggs than the other genotypes. The techniques were judged to be equally effective in identifying possible resistance. The use of mainstem terminals enclosed with cotton-organdy sleeve cages was more economical of time and space than the other methods for mass-screening. In addition, females were exposed to both foliar and fruiting stimuli by this method.
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