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Control of the Walnut Aphid and Codling Moth on Walnuts in Northern California1

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In northern California on most walnut varieties it is necessary to apply a regular seasonal spray to control the walnut aphid, Chromaphis juglandicola (Kaltenbach), and the codling moth, Carpocapsa pomonella (L.). It would be advantageous to the grower if a single compound would control both pests, as the timing of the first spray is the same for the 2 insects. Experimental field plots were established for 2 seasons to evaluate compounds that might serve this dual purpose.

Phosphamidon, after trials in 2 seasons, and BidrinĀ® (3-hydroxy-N ,N-dimethyl-cis-croton-amide dimethyl phosphate) in a single season of use, gave good control of both walnut aphid and codling moth. Endosulfan II (the high melting isomer of endosulfan) also showed promise against both pests while endosulfan was effective only against the walnut aphid. MorestanĀ®( (6-methyl-2,3-quinoxal-inedithiol cyclic carbonate) g-ave excellent control of walnut aphid and spider mites, but was not elIective against codling moth. Dimethoate was an excellent aphicide, but caused phytotoxicity which would preclude its use on walnuts. ImidanĀ®(phthalimidomethyl O,O-dimethyl phosphorodithioate) and Bayer 37344 (4- (methylthio) -3,5- xylyl methylcarbamate) controlled codling- moth, but the walnut aphid increased on the plots to higher numbers than were recorded upon the unsprayed check. Both materials, especially Bayer 37344, were toxic to predators.

Document Type: Research Article

Publication date: December 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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