Maricybele, used DE on ants but not on flies. Give it a try and see what happens. The "Monterey Garden Insect Spray" which is organic just might be what you need. I did a post on it in the "Garden Disease Pest Forum". Does your compost pile heat up during the composting process or is it let it set for a year and breaks down naturally? Ami
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Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,
totally worn out, shouting ‘...Holy Crap .....What a ride!'
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