The Douglas fir beetle, Dendroctonus pseudotsugae Hopkins, normally mass attacks Douglasfir, Pseudotsuga menziesii (Mirb.) Franco, at a density of 8–10 females/0.1 m2. An attack at this density kills the tree and establishes a new beetle brood. When the aggregation pheromone Douglure (2 attractants and 2 host cofactors) and a natural aggregation inhibitor 3-methyl-2-cyclohexen-l-one (MCH) were placed on or near live hosts simultaneously and in varying ratios, the colonization behavior of the Douglas fir beetle was altered. These alterations in behavior affect number of attacks, total height of attack, length of parent galleries, and proportion of successful galleries. Below a threshold of 4–6 attacks/0.1 m2 of bark surface, the females were unsuccessful in establishing a brood, and the tree survived. These results suggest a new concept (the pest population sink), which modifies the behavior of this pest with chemicals.
Document Type: Research Article
Publication date: August 1, 1978
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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.