Progress in the Development of Soiling Plans for Bemisia tabaci in Cotton

Steve E. Naranjo and Hollis M. Flint


 
ABSTRACT

Preliminary sequential sampling plans are reported for immature stages of Bemisia on cotton. These plans were developed based on detailed examination of within-leaf, within-plant, and within-field distributions of egg and nymphs (crawler through pupae) stages during the 1992 growing season in central Arizona. The most efficient sample unit for eggs and nymphs was determined to be a single 3.88 cm2 circular plug taken from the basal portion of the 2nd sector of the 5th mainstem node leaf (counted from the terminal). Tentative plans are tabulated relating cumulative counts to sample size for fixed levels of precision.



Reprinted from 1993 Proceedings Beltwide Cotton Conferences pp. 673 - 674
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998