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Below is a list of recommended insecticides that can be used with the Fly Killer Kover. Please remember to always read and follow the manufacturer's recommendations and make sure the insecticide is recommended for back-rubber or cattle rub application. We highly recommend using a pre-mixed back-rubber insecticide. 

From experience, Gordon's Livestock Back Rubber and Pour-On works well. It is a 0.25% Permethrin premix available at most farm supply stores in 2.5-gallon plastic containers. 

If you must dilute, use white mineral oil. Drip oil (irrigation well pump lubricant) works well. We do not recommend using vegetable oil or water.