Fixed-Time Classification and Detection Plans for Alfalfa Snout Beetle (Coleoptera: Curculionidae)


Source: Journal of Economic Entomology, Volume 84, Number 4, August 1991 , pp. 1388-1395(8)

Publisher: Entomological Society of America

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Practical scouting plans are described that categorize the economic status of the alfalfa snout beetle, Otiorhynchus ligustici (L.), from direct visual counts of adults during 30-min field inspections. Plans were derived by fixing field-sampling time requirements as a linear function of beetle density and computing with the tstatistic the probability that true mean beetle density (Il) differs from the economic injury level, given estimated mean beetle density (x) from field scouting. Consequences of classification errors are stated as probability of financial gains and losses to dairy farmers. Worst-case yield loss scenarios are presented as a simple decision aid that dairy farmers can consult to minimize the probability of catastrophic losses. Survey and detection plans are derived from a geometric series for Poisson frequencies of beetle occurrence; plans can be used by regulatory personnel to identify the probability of detecting beetle infestations when field inspection is restricted to arbitrary time limits. General guidelines for implementing both sampling plans are discussed. Concurrent studies of alfalfa snout beetle population dispersion detected aggregation among soilborne larvae as well as among beetles emerging from soil overwintering sites. In contrast, dispersion of beetles on the soil surface following spring emergence was random.

Document Type: Research Article

Publication date: August 1, 1991

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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