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Timing of Treatments for Control of the Irregular Pine Scale

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Sprays of carbaryl or malathion at a rate of 1.0 lb active toxicant per 100 gallons of water afforded excellent control of Toumeyella pinicola Ferris (Homoptera: Coccidae) on Monterey pine in northern California when applications were made between mid-June and mid-July. Earlier or later applications were less effective. The peak of emergence of crawlers on twigs with a south or west exposure occurred as much as 1 month earlier than on twigs with a north or east exposure. The effectiveness of mid-June to mid-July applications was correlated with peak emergence on a whole-tree basis. There was evidence that either malathion or carbaryl was capable of killing scales which were recently established. A parasite, Coccophagus lycimnia (Walker) (Hymenoptcra: Aphelinidae), destroyed a low percentage of the female scales.

Document Type: Research Article

Publication date: December 1, 1965

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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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