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Single or multiple treatments with sprays of Bayer 21/199 (O-(3-chloro-4-methylumbelliferone) O,O-diethyl phosphorothioate) were used in field tests on ranches near Kerrville and Spur, Texas, for the systemic control of cattle grubs. At Kerrville five treatments with 0.75% spray completely prevented encystment of grubs. A single treatment with 0.5% spray prevented all but one grub from reaching the backs of treated animals. However, one treatment with 0.25% spray afforded only 53% control. At Spur groups of cattle were sprayed once with 0.5% 21/199. This treatment resulted in 90 to 96% control of grubs. Benefits derived from grub control and reasons for failure of 0.25% spray are discussed.
Document Type: Research Article
Publication date: June 1, 1959
More about this publication?
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.