Four Methods of Sampling to Measure Populations of Alfalfa Weevil Larvae1,2,3

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Abstract:

When 4 methods of sampling to determine larval populations of Hypera postica (Gyllenhal) were compared, all of them produced essentially the same ranking of 8 treatments of azinphosmethyl. The sequential stem method of sampling (% of stems infested X number of larvae per infested stem X number of stems per ft2) re- covered about 90% of the actual population and thus provided the most accurate estimate. Eight or 9 sweeps with a 15-inch net were required to produce the same estimate. D-Vac sampling recovered 19-25% of the actual population, and pan sampling recovered 29-38%.

Document Type: Research Article

Publication date: June 1, 1969

More about this publication?
  • 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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