I have the same problem and decided to search online. I seen your comment. Have you found anything out on how to get rid of them?
I had the same problem. After trying bleach, dishwashing liquid, and a number of other things, I decided to use Diazinon, a recommendation from my neighbor who had lived in Florida, growing oranges. One spray and a few day later, not a single one was around. Give it a try and good luck.
Do you have any standing water on or near your property? We have these little pesky gnats in Missouri, too. They reproduce the same way that mosquitos do. If you can't remove the stagnant water source, try adding a few drops of bleach to the water. Also, contact your locally owned garden center (not the big box type) because they will be familiar with the types of critters that are "bugging" you. Of course they will want to sell you their product, but because they are local and experienced, you will most likely have good results. Good Luck! Joni
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