In tests involving 270calves treated orally with single doses of systemic insecticides in bolus form, Dow ET-57 (Trolene) and Dowco-109 (phosphoramidothioic acid, methyl 1-, O-(-4-tert- butyl-2-chlorophenyl) O-methyl ester), gave high kills of Hypoderma lineatum (DeVill.) and H. bovis (L.). Control with both insecticides exceeded 90%. Dow ET-57 appeared to be as effective at a dosage rate of 85 mg./kg. as at 110 mg./kg. Dimethoate (O,O,-dimethyl-S- (N-methylcarbamolymethyl) phosphorodithioate), also called Am. Cyanamid 12,880, gave only erratic control at rates of 15 and 10 mg./kg. None of the three insecticides, when given orally, killed 100% of cattle lice, but dimethoate produced higher kills than Dow ET-57 or Vowco-109. When given as feed additives to 160 calves, Dowco-l09 at 2.0, 7.5, and 15 mg./kg. fed for 10,2, and 1 day, respectively, and Dow ET-57 at 55 mg./kg. fed for 2 days, caused grub reductions of 61 to 82%. Better results might have been obtained under more normal feeding conditions than prevailed in this test. As a complete coverage spray, Bayer 21/199 (Co-ral) 0.25 and 0.5% (from wettable powder) provided excellent louse control for at least 5 months. Dowco-109 (wettable powder) provided good louse control for a period of from 8 to more than 4 months. Neither Bayer 21/I99 nor Dowco-109 gave satisfactory control of grubs under the conditions of these spray tests, although each gave about 80% control in one test at a concentration of 0.5%. It was concluded that Bayer 21/199 might potentially provide "one-shot" grub and lie control on cattle.
Document Type: Research Article
Publication date: December 1, 1958
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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.