Temperature Regulation ofBemisia tabaci(Homoptera: Aleyrodidae) Populations in Imperial Valley Cotton
- 1 February 1985
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Economic Entomology
- Vol. 78 (1) , 61-64
- https://doi.org/10.1093/jee/78.1.61
Abstract
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.Keywords
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