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Pienus Infestation on True Firs in Western Washington1

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This is a first report of an undescribed ehermid of the genus pineus attacking both the bole and branches of Abies amabilis and A. gramlis with little apparent damage. It also distinguishes this insect from an apparently similar balsam woolly aphid (Chermes piceae Ratz.) that severely damages these same true firs. Pinells first instar larvae when settled on bark secrete long, irregular wax threads but retain activity up to molting, and in crowns does not cause galling of branch tips. Chermes with short, regular wax ribbons ribbons inactive, and causes "gouting" of branch tips.

Document Type: Research Article

Publication date: October 1, 1959

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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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