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Effectiveness of Carbaryl and Chlorpyriphos for Protecting Ponderosa Pine Trees from Attack by the Western Pine Beetle (Coleoptera: Scolytidae)

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A large-scale field experiment was conducted to examine the efficacy of 1, 2, and 4% chlorpyriphos and 1,2, and 4% carbaryl for protecting high-value ponderosa pine trees from attack by Dendroctonus brevicomis LeConte. Each of the 510 trees utilized in the experiment was separated by at least 0.4 km. At 1 month, 3 months, and 1 year after insecticide application, D. brevicomis pheromone was attached to the boles of treated and untreated check trees. All six treatments were regarded as effective 1 month after application. At 3 months after application, 1 and 2% chlorpyriphos were regarded as ineffective. One year after application, low mortality of untreated check trees hindered the determination of efficacy of the remaining four treatments. At 3 months and 1 year after application, significantly more Temnochila chlorodia (Mannerheim) were found in catchment traps beneath treated than beneath untreated trees. The best explanation for this is insecticide-induced mortality of T. chlorodia. There were no significant differences in numbers of D. brevicomis or Enocleris lecontei (Wolcott) in the catchment traps.

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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