It recycles nutrients back into the soil. Adding compost is also one of the best ways to improve a clay soil. Compost piles do not have to be smelly or attract bugs as some unconverted might believe. However improperly constructed piles, piles that are not turned regularly or piles that have thinner areas along the edges can provide refuge and breeding areas for some insects, according to U of I entomologist Phil Nixon. These cooler areas of the pile can harbor stable flies, house flies, and green June beetles.
Stable flies appear similar to house flies.
They can be distinguished from house flies by a needle-like beak that protrudes out in front of the head. If you don't see the beak, you may quickly feel its presence. The stable-fly uses this beak to feed on the blood of people and other animals. Adult flies lay their eggs in wet straw, strawy manure, piles of grass clippings, and other decaying organic materials. The maggots feed on the decaying organic matter.