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Outdoor Fly Repellent
Outdoor Fly Repellent. Flies are more than merely annoying: They spread bacteria and other disease-causing organisms. Outdoor fly repellents, in the form of sprays, lotions or topical applications, help to significantly reduce the risk that the insects pose to humans and animals.
Flies are more than merely annoying: They spread bacteria and other disease-causing organisms. Outdoor fly repellents, in the form of sprays, lotions or topical applications, help to significantly reduce the risk that the insects pose to humans and animals.
Pyrethrin Repellents
Fly repellents usually consist of natural or synthetic forms of pyrethrin. Pyrethrin is derived from the flowers of chrysanthemum plants. The substance offers a natural alternative to chemicals, but it loses its effectiveness within one to two hours of exposure to full sunlight.
Residual Repellent Considerations
Residual insecticide sprays work well as repellents when applied to outdoor surfaces where flies land and rest. Applications of such insecticides to decks, patios, barn walls and the outside walls of houses are effective for up to three weeks, unless the area is excessively dusty, according to the University of Minnesota Extension's website.
Synthetic Repellent Warnings
Pyrethroids, a synthetic form of pyrethrin, repels flies efficiently. It is effective for up to two weeks, depending on the form used. Large doses may be harmful to the neurological system of mammals. the substance poses a danger to beneficial insects and—if used around streams or ponds—to fish and waterfowl.
