Western Yellowjacket Wasp – Spring Control - Extension

Yellow Jackets most aggressive in fall - The Cullman Tribune

Colorado's mild winter and warm spring leave a sting - an increase

Vespula pensylvanica (western yellowjacket)

Colorado's mild winter and warm spring leave a sting - an increase

Yellow-Jacket Wasp Horticulture, Landscape, and Environmental

Western Yellowjacket Identification and Control Utah

How to Get Rid of Western Yellow Jacket Wasps: Facts & More

Vespula pensylvanica (western yellowjacket)

Marin Master Gardener: The buzz on yellowjackets – Marin

Wasps in the Woods

Western Yellowjacket - School IPM - USU Extension

Yellowjacket Wasp

Are your tree pests attracting wasps? - LAM Tree Service