Binomial sampling plans for estimatingBemisia tabaci populations in cantaloupes |
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Authors: | Athayde Tonhasca Jr John C Palumbo David N Byrne |
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Institution: | 1. Department of Entomology, University of Arizona, 85721, Tucson, AZ, USA 2. Yuma Valley Agricultural Center, University of Arizona, 85364, Yuma, AZ, USA
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Abstract: | Early season infestations of the sweet potato whitefly, Bemisia tabaci (Gennadius), on cantaloupes, Cucumis melo L., were determined by counts of the number of adults per leaf in fields near Yuma, Arizona. We used these data to develop binomial sampling plans based on the relationship between mean densities of whiteflies per leaf, m, and proportion of leaves infested with more than I whiteflies, PI, according to the empirical model ln m=a′+b′ ln−ln(1−PI)]. The models were developed for the presence-absence approach (I=0) and for a cutoff value of three whiteflies per leaf (I=3). Four independent data sets were used to evaluate the models. Both methods yielded reliable predictions at low infestation levels, but some of the higher m values were overestimated. As the tentative economic threshold for B. tabaci is three adults per leaf, which corresponds to low PI values, results of the binomial sampling were satisfactory for pest management purposes. |
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Keywords: | Bemisia tabaci sweet potato whitefly binomial sampling |
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