A Comparison of Co-Ral, Ronnel, and Ruelene Dusts for Screw-Worm Control

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Abstract
Livestock shipped into the Southeast from areas infested with screw-worms (Callitroga hominivorax (Coquerel)) are examined and treated with insecticide at livestock inspection stations operated by the U. S. Department of Agriculture. Tests were undertaken to develop a dust treatment as an alternative for spraying so that wetting of the animals in cold weather could be avoided. In experiments using artificially infested animals, power dusting was as efficient as hand dusting, and Co-Ral (O-(3-chloro-4-methylumbelliferone)O, O-diethyl phosphorothloate) dust was more effective than Ruelene (0-4-tert-butyl-2-chlorophenyl O-methyl methylphosphoramidate) or ronnel dusts in killing screw-worms and preventing reinfestation for 48 hours.

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