Sampling Alfalfa Seed for Clover Seed Chalcid Damage1

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A method is presented for rapidly estimating the per cent of harvested alfalfa seeds damaged by the clover seed chalcid, Bruchophagus gibbus (Boh.). The method utilizes a. technique of cementing a sample of seeds on paper to permit rapid microscopic examination.

Three sampling experiments were conducted to determine the variance components associated with individual steps in the process of determining the level of chalcid infestation in a particular treatment. An optimum sampling scheme was developed from these components and from the cost of conducting the experiments. Two field samples per treatment were each sub-sampled twice. Two separate estimates of infestation were made on each sub-sample. This scheme permitted the best estimation of a treatment mean within 15% of the true mean, 95% of the time.

Document Type: Research Article

Publication date: August 1, 1960

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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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