Before using a pesticide, read the label. Understand the directions for proper preparation and application of the insecticide for a specific pest. Follow all directions and precautions. There are many insecticides registered for control of horse pests. Because registrations change rapidly, specific products are not mentioned in this fact sheet.
Resistance tends to develop by class rather than by individual product.
If resistance seems to develop, switch to a product in another class. Also, rotate from insecticide class to insecticide class to avoid the development of resistance. Pesticide applications can be divided into area sprays, residual premise sprays and direct animal treatments. Fine droplets are dispensed into areas occupied by flies, killing them on contact. This method is very efficient in terms of time and labor but has no long-term effect on fly populations.