I've got a compost pile that has a nasty population of fruit flies. Probably started because I left veggie waste in the open for too long before adding it to the bin and dressing it.
Is there easy way to keep them from reproducing? Maybe a garden-safe additive I can put on the pile? The bin is outdoors and well away from my house, so they're not a real problem, but they make turning the pile a serious annoyance.
Our store has some compost dumpsters, we probably put literal tonnes of rotten meat and bread and produce in them every week.
Obviously, we don't do anything with it besides selling it, but I've never noticed any flies or anything, even when they get really full. It's probably just a matter of keeping it covered except when you're putting stuff in. I haven't seen them putting any additives in.