Insects and diseases can pose serious threats to a forest’s health. Our foresters monitor insect and disease activity and trends, and respond to emerging threats to our communities’ forests.

Common Insect & Disease Concerns

If your questions cannot be resolved with the information provided, please contact the Granby Field Office. Foresters are available for site visits to look at specific insect or disease concerns on your property.





Piñon Pine


The 2015 Report on the Health of Colorado’s Forests provides an overview of insect and disease conditions in all of the state’s forests.

Forest Insect & Disease Aerial Survey

The annual survey is led, coordinated and funded by the U.S. Forest Service. A small fixed-wing aircraft is flown between 1,000 to 1,500 feet above the treetops while surveyors mark on a map the location, number and identity of trees affected by insects or diseases. 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.