Grand Junction Field Office – Insects & Diseases
Insects and diseases can pose serious threats to a forest’s health. Our foresters are available for site visits to look at specific insect or disease concerns on your property.
If your questions cannot be resolved with the information provided, please contact the district office. Foresters are available for site visits to look at specific insect or disease concerns on your property. Samples of the problem also can be sent to our state entomologist in Fort Collins for further investigation.
Common Local Insects and Diseases
- Lilac Ash Borer (1.5 MB PDF)
- Juniper Borer (255 KB PDF)
- Ips Bark Beetle (298 KB PDF)
- Twig Beetle (109 KB PDF)
- Common Piñon Pine Pests Fact Sheet (297 KB PDF)
- Aspen Scale (305 KB PDF)
- Oystershell Scale (78 KB PDF)
- Poplar Borer (115 KB PDF)
- Sudden Aspen Decline (2.3 MB PDF)
If you are concerned that your tree is susceptible to Bark Beetles, please read this fact sheet (2.4 MB PDF). It will help you identify what type of tree you have, determine the tree’s susceptibility and decide if your tree has been attacked. The fact sheet also gives tips on how to prevent bark beetles from attacking your trees.
The 2020 Report on the Health of Colorado’s Forests (7 MB PDF) is available online. The report provides an overview of insect and disease conditions in all of the state’s forests.
Please contact the Grand Junction Field Office with any questions.
For additional information, visit the CSFS Insect & Disease Publications page.
The annual survey is led, coordinated and funded by U.S. Forest Service – Health Protection personnel. A small fixed-wing aircraft is flown between 1,000 to 1,500 feet above the treetops while surveyors mark the location, number and identity of trees affected by insects or diseases on a map. The CSFS has assisted in the aerial survey since the 1970s and began playing a larger role in 1997.
For more information about the state aerial survey, visit the U.S. Forest Service Rocky Mountain Region website.
The Colorado State Forest Service and the Colorado State University Extension office have worked together to create factsheets on a wide range of subjects including native and exotic insects and diseases, in addition to the ones listed above. To access the library of publications, go to the CSU Extension website.