Beneficial Nematodes

Another way to prevent maggots from developing into flies is to use nematodes. Nematodes are microscopic, non-segmented worms that naturally occur in soil. They hunt fly maggots and other subterranean pests. When they find them they enter through body openings and emit a toxin that kills pests within 48 hours. Beneficial nematodes are shipped in clay. When they arrive you mix the clay with water then disperse where needed with a watering can or sprayer.

Manure Management

Keeping the area where your animals hang out clean is the first step to fly control. Making a compost pile will help by causing the manure to break down and be unusable by the flies. The flies can only use the first six inches of the manure because the rest will be too hot. So the manure in the middle of you compost will not breed the flies. Gathering the manure into a pile will also localize where the flies are breeding and make a good spot to let the fly predators go.