Abstract
The cattle grubs Hypoderma lineatum (de Vill.) and H. bovis (L.) were controlled through various methods of applying three systemic insecticides: Co-Ral® ( O -(3-chloro-4-methylumbelliferone) O,O -diethyl phosphorothioate), Dowco 109 ( O -(4- tert -butyl-2-chlorophenyl) O -methyl methylphosphoramidothioate) and Ruelene® (4- tert -butyl-2-chlorophenyl methyl methylphosphoramidate). In a series of tests these three systemic insecticides were applied at low pressures (80 to 100 pounds). Grub control by Co-Ral was excellent and unaffected by the addition of household detergent at the rate of one-half pound per 25 gallons of spray. Backrubber applications of 5% Ruelene as an oil solution failed to systemically control the cattle grubs. Spray-Dip machine applications of Co-Ral and Ruelene were moderately effective. No increase in gains in weight attributable to the systemic grub control was observed.
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