Effect of Number of Pink Bollworm Larvae Per Boll on Yield and Quality of Pima and Upland Cotton

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The effects of the numbers of pink bollworm (PBW), Pectinophora gossypiella (Saunders), per boll of Deltapine 16, a cultivar of upland cotton, Gossypium hirsutum L., and Pima S-5, a cultivar of American Pima cotton, G. barbadense L., were evaluated. For each PBW per boll, lint losses were 14 and 24%, and seed weight losses were 12 and 22%, in Deltapine and Pima, respectively. The relationship between PBW per gram seed-cotton and boll dry weight was the same in both cultivars, which indicated that the infestation susceptibility was the same in both cultivars. However, in the smaller bolls with equal larval densities, the percentages of damaged seed were greater in Pima than in Deltapine. In both cultivars, the lint per seed was negatively correlated to the percentage of damaged seed. The percentage of fluorescent seed (an index of aflatoxin-forming fungus) increased with the number of larvae per boll. Lint quality decreased as the infestation level increased.

Document Type: Research Article

Publication date: June 1, 1978

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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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