An Improved Method for Determining Colony Vigor of Western Harvester Ants, Pogonomyrmex occidentalis1

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The selection of colonies of the western harvester ant Pogonomyrmex occidentalis (Cresson), of similar population size and stage of development, without destroying parts of their mounds, is important for the successful evaluation of insecticidal controls. It was found that a drop of liquid, obtained by mascerating large numbers of harvester ants in a blendor, when placed near the primary mound opening of the colony, caused an immediate and frenzied emergence of ants from the opening. It was noted that colonies of equal vigor, regardless of mound appearance or ground surface temperatures, produced similar intensities of reaction to the liquid, thus facilitating the selection of intact colonies for study.

Document Type: Research Article

Publication date: August 1, 1964

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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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