Sequential Sampling of Brachycaudus helichrysi (Homoptera: Aphididae) in Sunflower Fields

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A sequential sampling plan for the leaf-curling plum aphid, Brachycaudus helichrysi Kaltenbach, on sunflower was developed using the fixed-precision method of Green. Our sequential sampling plan was validated using a resampling simulation approach with 5 independent data sets ranging in density from 5.8 to 188.2 aphids per sample unit. Sampling plans with a relative precision level of 0.30 were not recommended because of the low sample number and high variation that invalidated the normality assumption. Simulated results did not agree with the desired precision level for only 1 data set. This data set also deviated from our Taylor power law model. For the other data sets, simulated precision levels were generally better than the desired fixed levels. Variability of the B. helichrysi sequential sampling criteria was high for mean estimates and for the levels of precision.

Document Type: Research Article

Publication date: December 1, 1996

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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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