I'm afraid I take a much cruder approach. We have a fruit fly infestation every summer, and besides keeping fruit and other food out of their reach, I simply hu

I'm afraid I take a much cruder approach. We have a fruit fly infestation every summer, and besides keeping fruit and other food out of their reach, I simply hunt them down. Nearly every summer our walls are a graveyard of hundreds of drosophila corpses. (Though I haven't seen many of them yet this summer.) Unfortunately they leave ugly spots on our walls and ceilings, and most walls are not that easy to clean, so I developed a couple of techniques where I don't squash them on the wall: I slap my hands together just above where they're sitting, they see my hands move and fly up, just between my hands. Timing takes some practice, but I've had thousands of opportunities to perfect this technique. Our kitchen wall has been treated to make it easy to clean, so there I just squash them against the wall, which is much easier.