While mowing today there was a patch of Sumac about waist high. When I went thru it wasps wrapped up the tractor. They concentrated around the muffler and engine. I managed to make three passes and cut all sumac without getting stung. Lucky they were red wasps and not the little stripped guinea wasps. Guinea wasps and yellow jackets have no sense of humor. I once had to abandon my dozer for twelve hours because of hitting a stump full of yellow jackets.