Methyl Bromide Residues and Desorption Rates from Unshelled Walnuts Fumigated with a Quarantine Treatment for Codling Moth (Lepidoptera: Tortricidae)

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California walnuts were fumigated unshelled with a quarantine treatment to control codling moth, Cydia pomonella (L.). The treatment was done with 56 glm' methyl bromide for 4 h at 15.6 and a chamber pressure of 100 mm Hg. There were no significant differences in organic or inorganic bromide residues regardless of walnut cultivar or size. Inorganic residues were below the established tolerance level of 200 ppm. The 'Eureka' cultivar, although not significantly different in its desorption rate of residual methyl bromide, had higher organic residues than the other cultivars tested. Residue levels in treated nut meats showed no significant change in inorganic bromide content over a 25-d period. Accumulated inorganic bromide residues in nut meats fumigated once or twice with a domestic methyl bromide schedule (56 glm' for 24 h at 15.6) to control field infestation and stored-product insects followed by fumigation with the quarantine treatment did not exceed the established tolerance level. Residual methyl bromide in treated nut meats stored unshelled at 1.7 or 1000C was ˜10 ppb after 70 or 53 d, respectively, whereas those stored at 21 or 32 had ˜10 ppb after 20 or 14 d, respectively.

Document Type: Research Article

Publication date: August 1, 1991

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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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