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Western PA

Yesterday it was warm (78 degrees)here in western PA. The day before, I was turning my compost and descided to spread it out and let it dry a little for a day. I noticed yesterday that there were these yellow flies all over the compost. Alot of them were mating and I would think that maybe they are laying eggs in there, but I don't know that.
These flies had yellow eyes and a yellow body, and their wings went straight back in which it looked as though they had a single wing. There wings DID NOT look like the V shape of a house fly.
What are they and are they harmful to my compost?
Lee

4/16/2010 9:07:02 AM

Western PA

Here is a pic of them. http://www.bigpumpkins.com/Diary/DiaryViewOne.asp?eid=128527

4/23/2010 8:53:02 AM

Billerica,Massachusetts

Yellow Dung Flies just doing their job.

4/23/2010 12:55:16 PM

Western PA

Thank you, I googled it and it sounds like they are actually good. Their larvae hatch as predators and eat other insects.

4/23/2010 5:08:02 PM