Numbers of workers of Vespula pensylvanica (Saussure) (western yellowjacket) and V. atropilosa (Sladen) trapped with heptyl butyrate in Washington increased with greater release of the attractant from ...

The thousands of wasp species in the Vespidae family are divided into solitary or social categories. The social wasps live in a community to build nests, raise young, find food, and defend the nests.