Control of European Brown Snail in Citrus Groves in Southern California with Guthion and Metaldehyde Sprays1

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Metaldehyde and Guthion® (O,O-dimethyl S-(4-oxo-1,2,3- benzotriazin-3-( 4H)-ylmethyl)phosphorodithioate) sprays were evaluated in field tests for their control of European brown snail (Helix aspersa Müller) on citrus in southern California. Metaldehyde, at higher dosages, was effective against snails infesting lemons. There was no measurable difference between snail mortality from metaldehyde wettable powder and that from aqueous suspension treatments when compared on the basis of metaldehyde equivalents. Against snails infesting Valencia oranges metaldehyde was only partially effective. The dense foliage of Valencia orange trees appeared to protect the snails falling beneath the trees from the desiccating influence of sun and wind, with the result that many snails recovered from the effects of the metaldehyde treatment. Guthion was highly effective against snails infesting both Valencia oranges and lemons. Among snails infesting Valencia oranges, mortality rates obtained with Guthion were comparable with those obtained with a standard treatment of tartar emetic and sugar. Among snails infesting lemons, mortality rates in Guthion plots were superior to those obtained in plots treated with proprietary bait composed of tricalcium arsenate, metaldehyde, and bran. Because of its demonstrated effectiveness, Guthion appears to be a promising molluscacide. Its use on citrus for other purposes or as an additive to other combined materials used in citrus spray treatments applied during periods of high snail activity would provide adequate snail control without involving prohibitive costs.

Document Type: Research Article

Publication date: February 1, 1961

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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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