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Whitefly,  Bemisia tabaci  (Gennadius), is a major constraint for seed potato production in India. For its efficient management, the within-plant distribution of  B. tabaci  was explored, and a sequential sampling plan was developed for potato crops. The highest proportion of  B. tabaci  adults, nymphs, and eggs was found on leaf numbers 3–7, 6–9, and 2–6, respectively (with leaf numbers beginning at the apical meristem). The count of adults from three leaves (nodes 4, 5, and 6) from the top stratum in a plant is proposed as a sample unit. Green's and Kuno's methods were used to develop fixed precision sequential sampling plans which yielded a similar average required sample size, except at lower densities (≤1 whitefly per plant). This information will enable efficient monitoring of  B. tabaci .

Studies on the within-plant distribution of whitefly, Bemisia tabaci (Gennadius) in potato and development of a sequential sampling plan