Developmental Time of Sweetpotato Whitefly (Homoptera: Aleyrodidae) in Small Field Cages on Cotton Plants
Abstract
Immature development of the sweetpotato whitefly, Bemisia tabaci (Gennadius) was studied on cotton plants in the field using small cages to confine insects on the leaf. Eggs, nymphal instars, and empty pupal cases were counted every 2 to 4 days, and physiological time was calculated using developmental thresholds of 10@*C (minimum) and 32@*C (maximum). Developmental times for the various life stages were similar for both years of the study (1984 and 1985). Heat units for eggs, nymphs, and pupae averaged 27.0, 268.5, and 73.0 degree-days, respectively. The average generation time was 369.5 degree-days.Downloads
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