Evaluation of Cultivars, Germplasm Lines, and Species of Gossypium for Resistance to Biotype "B" of Sweetpotato Whitefly (Homoptera: Aleyrodidae)
We evaluated 19 cultivars, germplasm lines, and species accessions of cotton and wild relatives, Gossypium spp., in a field, plot experiment for resistance to biotype "B" of the sweetpotato whitefly, Bemisia tabaci (Gennadius). We collected leaf samples on eight dates from 9 June to 14 September and counted eggs and nymphs. Egg and nymph numbers were <1 per g of leaf weight through June, then began to increase rapidly, reaching 5,100 eggs by mid-August and 2,000 nymphs by mid-September. The rate of increase in Arizona wild cotton, G. thurberi Todaro, was significantly slower and numbers of eggs and nymphs were significantly lower than in the two upland, G. hirsutum L., control cultivars 'Deltapine 50' and 'Stoneville 506'. The 19 cotton entries were divided into four leaf pubescence classes: glabrous, moderately pubescent, pubescent, and highly pubescent. Although no differences in numbers of eggs were obselved among the pubescence classes, the glabrous entries averaged fewer nymphs than the moderately pubescent or pubescent entries, but not fewer than the single highly pubescent entry, G. raimondii Ulbrich. The control upland cultivars, three upland germplasm lines, and the single G. barbadense L. cultivar 'Pima S-6' wilted, defoliated, and opened bolls prematurely because of extreme sweetpotato whitefly pressure. In spite of very high numbers of insects, none of the other entries except G. raimondii showed visible wilting and defoliation.
Document Type: Research Article
Publication date: December 1, 1993
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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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