The teeny tiny mosquitos were probably gnats and they can bite too. They do come right thru the screens. When we arrive and will be parking for more than a day or two, we spray our site with Home Defense. We also put an outdoor carpet down under the awning. Compared to the neighbor who doesn't and is just sitting on the stones, we have far fewer mosquitos. If they did get really bad, we would either stay inside our put a fan blowing under the awning. So far, we have not had to do that. If I work outside and will be out for several hours, then it's the deet.