Abstract
Results are presented of tests of a number of promising repellents when used under range conditions for the protection of cattle, sheep, goats and other animals against the screw worm fly Cochliomyia macellaria. In these experiments the worms were first killed with benzol and the repellents applied every other day until the wounds were healed. Considering effectiveness and various other factors, pine tar oil with specific gravity of 1.065 ranks first among the materials tested. The 18 repellent mixtures used in these experiments were selected as being the most effective of several hundred, as determined by extensive laboratory tests.
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