Temperature Regulation of Bemisia tabaci (Homoptera: Aleyrodidae) Populations in Imperial Valley Cotton

Authors: Zalom, Frank G.; Natwick, Eric T.; Toscano, Nick C.

Source: Journal of Economic Entomology, Volume 78, Number 1, February 1985 , pp. 61-64(4)

Publisher: Entomological Society of America

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Bemisia tabaci (Gennadius) populations were sampled weekly in 14 cotton fields throughout the Imperial Valley in southern California during 1982 and 1983. Developmental thresholds were estimated to be 10.0°C (lower) and 32.2°C (upper) when linear regression was used to determine the least coefficient of variation of mean generation times calculated from a combination of possible thresholds. These compared favorably to thresholds derived from environmental chamber studies with a linear approximation technique. The mean generation times derived from the field studies (n = 90) were 316.3 degree-days (°D)in 1982 and 316.0 °D in 1983. However, estimated heat-unit accumulations between observed peaks were much more variable. Valleywide summaries of the weekly samples showed that B. tabaci population grew exponentially during the cotton production season in both years.

Document Type: Research Article

Publication date: February 1, 1985

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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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