Repellent Sprays for Flies Attacking Dairy Cattle

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Abstract
The protection of dairy cows from attack by blood-sucking flies, especially the horn fly, Haematobia irritans and the stable fly, Stomoxys calcitrans, is a live problem. The use of repellent sprays appears thus far to offer the only feasible means of control in the majority of cases. The practice of using some kind of repellent cattle fly spray is more prevalent than might be supposed, but the choice of a spray has heretofore been governed largely by the chance availability of some particular brand of proprietary material rather than of considerations based on comparative cost, effectiveness and practicableness. Two seasons' tests conducted under practical farm conditions have resulted in clarifying knowledge concerning the general feasibility and value of spraying on the average dairy farm as well as the comparative effectiveness, cost and practicableness of various fly spray formulae. The more promising commercial and home-mixed materials were tested. Of all these a new, exceedingly inexpensive spray composed of used crank case oil and oil of tar in proportions of one gallon to one pint, has offered the most promising results in terms of effectiveness, cost, and practicableness from every standpoint.

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