Pyrethrum-oil films were tested in various forms on plaster substrata against the tick, Ornithodorus moubata. The insecticide was most effective if applied :— 1. Concentrated rather than dilute. 2. In a medium rather than a light petroleum oil. 3. As an emulsion in Lanette Wax Solution rather than in oil alone. 4. With an irritant (such as 4-chlor-2-methyl-phenol) present in the solution.
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G. G. Robinson (1943) studied this question.
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