Abstract
Experiments were carried out to determine the effect of repellents against ticks in the laboratory and in an infested natural cave. The materials were applied to rats by spraying them with a solution of the repellent in ethanol. Pyrethrum was outstanding and far superior to the other repellents in preventing ticks of all stages from biting; however, it did not repel ticks from a distance. Further, pyrethrum had a delayed toxic effect on ticks in laboratory experiments.

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