Absolute-Density Estimation from Sweep Sampling, with a Comparison of Absolute-Density Sampling Techniques for Adult Potato Leafhoppper in Alfalfa

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Abstract:

A study of sampling techniques for adults of Empoasca (abae (H~rris) in alfalfa was undertaken to derive ahsolute-density estimates from sweep-net sampling. A comparison of three absolute- density techniques showed that either the D-Vac" or a modified Echo'" suction device, operated with a small drop trap. yielded accurate estimates upon which the relationship of sweep-net catch and absolute density suhsequently was hased. Large drop trap sampling may be highly influenced hy the density and uniformity of the alfalfa stand. Sampling several meters in front of the individual to avoid disturhing potato leafhoppers, compared with sampling immediately in front of the individual. gave no measurable advantage. Sweep-net sampling in fields that had been cleanly harvested yielded precise estimates of absolute density, using the equation x = IX.5y, where x = adult potato leafhoppers per m' and y = catch per sweep. Distribution of five-sweep samples in cleanly harvested fields followed a Poisson series, and optimum sample size curves were determined. Harvesting of a portion of an alfalfa field altered the spatial distribution of potato leafhopper adults.

Document Type: Research Article

Publication date: June 1, 1982

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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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