Species
Vespula pensylvanica (Western yellowjacket)
Vespula pensylvanica. Photo: (c) Steven Mlodinow, some rights reserved (CC BY-NC)
The western yellowjacket (Vespula pensylvanica) is a Nearctic species of wasp in the genus Vespula. It is native to regions of North America, largely in areas with northern temperate climates. Its reproductive behavior is constrained by cold weather, which successfully reduces the number of western yellowjackets in cold months. However, in the absence of cold weather, this wasp’s population can explode. The western yellowjacket has become particularly invasive in the Hawaiian Islands, resulting in their label…
Sightings
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