[DonM]

I was this year old, when I discovered burning coffee grounds (regular NOT decaf) will make a LOT of otherwise irritating insects keep their distance - flies, mosquitos etc). Put a small cone-shaped pile in a metal lid and light the tip of the pile (like burning incense) it doesn't burn so much as it smolders and my garage was remarkably insect-free even at the wee hours of the morning (I very often wake up at 2 AM, and go to the garage to keep from waking up the wife). I DID GOOGLE it, and the bugs HATE, HATE, HATE something about the smell of the smoldering coffee/caffeine.