Sprays for the Control of Ticks about Houses or Camps

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Abstract
A spray containing 1 part of nicotine sulfate (40% nicotine) in 200 parts of water reduced the abundance of Dermacentor variabilis on vegetation by about 90% for 2 or 3 days, and was not injurious to foliage, but many of the ticks recovered. It is recommended where only temporary reductions are required. A spray containing 1.5% NaF and 0.5% nicotine sulfate (40% nicotine) gave quick knock-down and actual kill, but was injurious to foliage. It was effective against D. variabilis, Ixodes scapu-laris and Amblyomma americanum. It is recommended for use where there are no valuable plants and when permanent reductions in tick abundance are desired. Some prepns. of dinitro-orthocyclohexylphenol were almost as effective as NaF, but were equally injurious to foliage. A spray containing purified pyrethrum extract and an activator was effective against I. scapularis and A. americanum, and was not injurious to foliage, but the material is not at present available for civilian use. With each material an immediate reduction in tick abundance of more than 90% was obtained. The rapidity of reinfestation varied with the season; in most cases the reduction was at least 75% for a week.

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