Timing Post-Bloom Sprays for Peach Twig Borer (Lepidoptera: Gelichiidae) and San Jose Scale (Homoptera: Diaspididae)

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Post-bloom insecticide sprays for control of peach twig borer, Anarsia lineatella Zeller, and San Jose scale, Quadraspidiotus perniciosus (Comstock), were timed to larval and crawler emergence using precise day-degree (DD) accumulations after male moth or scale collections in pheromone traps. Optimum timing for peach twig borer treatment was 400 DD after first moth emergence in California; optimum timing for San Jose scale was 600-700 DD after first male scale emergence. These techniques for pest control in commercial orchards may help reduce pesticide usage by avoiding multiple sprays to the same pest generation, and improve coordination of sprays with other orchard operations.

Document Type: Research Article

Publication date: February 1, 1988

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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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