Colorado State University
Extension
Welcome to the Colorado State University Extension Western Colorado Entomology web site. This site was created and is maintained by Tri River Area Extension Entomology & Agronomy, and is dedicated to presenting factual information on the insects and insect related issues affecting western Colorado.
Japanese Beetle Detected in Mesa County
Read about this destructive insect.
2025 Western Colorado Pest Management Workshop
CEUs for pesticide applicators.
Hedgehog Grain Aphid in Colorado.
A Threat to Wheat Production?
Russian Wheat Aphids
Russian Wheat Aphids on wheat.
Phylloxera
Phylloxera on grape roots. Photo by Melissa Franklin
Western Colorado Insects - Providing trusted, practical education to help you solve problems, develop skills and build a better future.
Swarm Removal and Beekeepers Info.
If you need assistance with swarm removal in the Tri River Area, the Colorado River Corridor and NW Colorado contact the Western Colorado Beekeepers Association swarm line number (970) 812-0080. Visit the Western Colorado Beekeepers Association website or on Facebook for more information on beekeeping.
More Info.