Laboratory tests showed that boll weevils (Anthonomus grandis Boheman) did not discriminate between flower buds from red and other strains of cotton. In similar tests, when offered the "choice" of glandless and normal buds, they exhibited a preference for the normal condition. When a "choice" between glandless and normal was combined with a "choice" between hairy and nondairy buds, preference was confined to the nondairy types, with no discriminations between glandless and normal. A field test is reported in which four strains of cotton (a standard Upland variety and three mutant strains, hairy, hairy-glandless, and hairy-glandless-red) were compared. All hairy strains received les damage that the standard Upland variety, but the weevils did not discriminate between the hairy and hairy-glandless strains, Data from the hairy-glandless-red strain were incomplete, but suggested that the inclusion of the red character in a hairy strain might increase resistance to boll weevil attack. The resistance associated with hairiness could be separated into two categories: 1. Mechanical resistance, due to the fact that the bracteoles of hairy plants are "scaled" during the early stages of development, thus protecting temporarily the enclosed flower buds from damage. 2. Presumed antibiotic effects—larvae were found to develop less rapidly in hairy than in nondairy buds.
Document Type: Research Article
Publication date: December 1, 1961
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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.