The recent shift to nonpersistent insecticides for control of wire worms, Limonius spp., increased the need for a rdiable method of sampling to detect and estimate economic populations (> 0.1 per ft2). When homogeneous populations of < 3 per ft2" were sampled by using sub samples 1/4-ft2or smaller, sampling data followed a Poisson distribution; therefore. Poisson confidence limits were applied to results of sampling. Even when infestations were not uniform, the upper limit of the 90% confidence inter- val for sample means provided an economically prudent estimate of the population in soil to be planted to susceptible crops. A nomograph was constructed from which the upper confidence limit for a range of sample means can be obtained without computation. The nomograph has several practical uses that probably could be adapted to sampling for other insects that have low economic thresholds and that might, therefore, be found in a Poisson distribution.
Document Type: Research Article
Publication date: February 1, 1969
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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.