wasps and yellow jackets
i have 5 large pine trees that look more like bushes. Every year, all spring to fall, one and only one is covered with wasps and yellow jackets. There are no nests any where around and they only go after the one tree. I've sprayed them,set traps, once even draped a large plastic sheet around it an set up an insect fogger. they alwasy come back to that tree. any suggestions?