Totally by accident, we discovered a way to greatly reduce the Yellow Jacket population around our rural home. My wife transplanted a large Snowball bush near our house. A few years later, we started putting out the pheromone-baited traps, and the one on the Snowball filled up, while the other caught only a few. We have since planted three more Snowballs, and Yellow Jackets are quite rare. Before we started putting out the traps, eating outside during the late Summer was almost impossible because of the little buggers!