Abstract
The distribution of the red-eye nymphs of the tobacco whitefly, Bemisia tabaci (Gennadius), within the cotton plant was analyzed during the growing season 1980–1981. Whiteflies distinctly aggregate on and around a main stem leaf, whose location varies according to plant growth and cotton variety. Sampling costs were reduced considerably by counting red-eye nymphs on a distal leaf sector only. The mean crowding index was used to define numerical and sequential sampling plans with a given precision level.
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