A Comparison of Ronnel and Co-Ral Sprays for Screw-worm Control

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Abstract
Co-Ral ( 0 -(3-chloro-4-methylumbelliferone) 0,0 -diethyl phosphorothioate) was the first insecticide recommended by the U. S. Department of Agriculture for application as a water-base spray for the control of the screw-worm ( Callitroga hominivorax (Cqrl.)). Previously all the screw-worm control formulations were smears or solutions in volatile solvents intended for application with a paint brush or a pressurized spray applicator.

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