Western Colorado Insects

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.

Entomology Alerts!

Sipha maydis

(Hedgehog Grain Aphid)

in Colorado

Sipha maydis

Spotted Wing Drosophila in

Western Colorado!

Spotted Wing Drosophila (Drosophila suzukii), was confirmed from  Mesa County raspberries in early October 2014. This exotic pest of small fruits, stone fruits, and other soft fleshed fruits has been present on the front range near Ft. Collins since 2012.This is the first confirmed capture in western Colorado. SWD was first found in the US in 2008 and has since spread to many states and northward into Canada.  For more information visit our spotted wing drosophila page.

Photo by Ed Show

Brown Marmorated Stink Bug

Brown marmorated stink bug is present in Colorado in low numbers. Introduction from travlers coming from the Eastern US is common. They have not done any economic crop damage in Western Colorado yet, but we need to keep watching. Be especially aware of large numbers of stink bugs overwintering in homes.
Stop Brown Marmorated Stink Bug logo



Intermountain Forage and Legume Production Manual
2nd Edition

Forage Manual Cover
The Intermountain Grass and Legume Forage Production Manual is now available online in PDF format. Individual chapters are available for download.

This page was updated on March 27, 2017

What's New

2017 Western

Colorado Pest



Feb. 15-16, 2017

Two Rivers

Convention Center

Grand Junction, CO


Past Workshops

2016 WCPMW

2015 WCPMW

2014 TRA PMW

2013 TRA PMW

2012 TRA PMW

2011 TRA PMW


March 14th
Master Gardener Vegetable Garden Presentation Notes


  • If you are a local honey beekeeper wanting to share or acquire knowledge about beekeeping, please visit the Western Colorado Beekeepers Association website or on Facebook.
    The Western Colorado Beekeepers Association has a phone line set up to assist with honeybee swarm removal. In anticipation of the busy season the WCBA has partnered with the Four-Corners Beekeepers to more effectively serve the needs of the public.  Due to the terrain of the Western Region, the Four-Corners Beekeepers have agreed to take swarm calls for Archuleta, Dolores, Hinsdale, La Plata, Montezuma, San Juan and San Miguel counties. The Western Colorado Beekeepers will take calls and attempt to partner with beekeepers in the remaining Western Region counties.

  • If you need assistance with swarm removal contact:
    The Western Colorado Beekeepers Association swarm line number
    (970) 812-0080.

    The Four-Corners Beekeepers Association swarm line number is (970) 884-8190. Or visit the FCBA website.  They can also be found on Facebook.

  • Also the CSBA (Colorado State Beekeeper Association of the metro region) also has a swarm line which can handle calls in Denver and other areas in Colorado, 1-844-SPY-BEES.

Grape Seed Chalcid Poster Thumbnail
Grape Seed Chalcid poster presented at Entomological Society of. America Annual meeting, 13 Nov 2013, Austin TX

Other Useful Links

Arthropods of Colorado
Bugwood-High Plains IPM
Bugwood Main Page
CDMS-Pesticide Labels
Upper Grand Valley Pest Control District

Home Use
Pesticide Labels

Bayer Advanced
Fertilome, Hi-Yield,
Natural Guard, VPG