Binomial Sequential Classification Sampling Plans for Russian Wheat Aphid (Homoptera: Aphididae) Management: Robustness Varying with Tally Thresholds of Aphids in Sample Units

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Abstract:

Binomial sequential classification sampling plans were developed for use in classifying populations of the Russian wheat aphid, Diuraphis noxia (Mordvilko), below or above a mean intervention-threshold density (>miT) for management decision making. Based on 4 yr of field data from summer and fall populations on wheat and barley in the northwestern United States, the proportion of tillers with no more than T (tally threshold) aphids (PT) was related to mean aphid density (m) with an empirical model in the form of In[ -In(PT)] = a + b ln(m) and the negative binomial distribution. Three mean intervention threshold (mIT) values (one, five, and 10 aphids per tiller) with a series of T values were used to satisfy needs for control of aphid populations varying in density at different crop stages. The sampling plans were evaluated using operating characteristic and average sample number functions computed using the empirical PT-m model or the negative binomial distribution model. The robustness of the sampling plans improved with increasing T values. When using empty tillers (T = 0), the resulting sampling plans were not robust for all mIT values considered. Based on the operating characteristic and average sample number functions, the recommended Tvalues for use are 2-4 for crops at stages before the end of booting given mIT = 1, 15-25 for crops at stages before heading given mIT = 5, and 20-40 for crops at stages after heading or flowering given mIT = 10. Sampling stop lines for each mIT and T are provided along with a discussion of their application to sampling aphid populations in the field.

Document Type: Research Article

Publication date: October 1, 1994

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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