Wasps act as [[pollinator]]s in the garden. Unlike [[bee]]s however, they do not produce honey, and unlike bees, they can sting more than once.
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If you have a lot of wasps that bother you in the garden, you can try the [http://www.priscillawoolworth.com/eco-garden_s/98.htm glass wasp catcher]. It is an organic way to trap these insects.