Wasps, unlike bees, are scavengers, which is why we often times find ourselves having to guard our meals from unwanted invaders. This is a hassle at barbecues and picnics. Since wasps are scavengers, not only do their stings cause a painfully intense reaction, but they may also put you at risk of infection. These pests are also able to sting repeatedly (unlike the honey bee, which dies shortly after it nips you).
Look under the eaves of your home, under your deck, in your attic rafters, playground equipment, sheltered branches and bushes, and any other areas that provide adequate cover from the elements for the paper nests paper wasps, hornets, and yellowjackets create. There are also several species of yellowjackets that nest in the ground, and we treat those pests as well.