Insects and diseases pose two of the most serious threats to a tree’s health. By examining specific symptoms of insect or disease damage, you can make a reasonable diagnosis of the problem and select the proper treatment.

If you are uncertain about the type of insect or disease or do not know how to treat them, contact your local CSFS Field Office to conduct a home-site assessment of the trees on your property.

Common Insects & Diseases in Colorado

Current Insect & Disease Activity in Colorado

Explore where insects and diseases are currently affecting forests in Colorado. This map shows data from an aerial survey conducted by the Colorado State Forest Service and U.S. Forest Service.

Select the arrows icon on the upper right to close the legend.
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Click, hold and drag your mouse to scan the map. On mobile, press your finger on the map, then move your finger to shift.
Click on a color-highlighted shape to display more information.
Mobile users may view a larger version of the map by visiting the Esri ArcGIS website.

Forest Health Story Map

CSFS Forest Entomologist Dr. Dan West produces an Esri Story Map for the annual Forest Health Report. Explore the story map to learn how insect and disease data are collected during an annual aerial survey and find out more about forest conditions in your area.

Current Insect and Disease Activity by County and National Forest