Relationship Between Lower-Crown Sampling and Midcrown Sampling for Choristoneura occidentalis (Lepidoptera: Tortricidae) After Treatment with Bacillus thuringiensis

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Abstract:

We found no change in the relation between densities of western spruce budworm, Choristoneura occidenta/is Freeman, determined by lower-crown sampling and densities determined by conventional midcrown sampling on host trees in a suppression project with Bacillus thuringiensis Berliner. The relationship was tested on units treated withB. thuringiensis and on untreated units. We present an equation that provides an improved means to predict midcrown densities based on lower-crown population estimates. Analysis of larval densities before treatment and densities 1 yr after treatment broadens application of the equation to include the full range of fourth to final instars for natural, untreated budworm populations, as well as for sampling before treatment and sampling after treatment with B. thuringiensis.

Document Type: Research Article

Publication date: August 1, 1994

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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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