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.
Granby Field Office – Insects & Diseases
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.
Pine
- Dwarf Mistletoe Management (127 KB PDF)
- Mountain Pine Beetle (362 KB PDF)
- Ips Bark Beetle (298 KB PDF)
- Twig Beetle (109 KB PDF)
Spruce
Fir
- Douglas-fir Beetle – 2016 Quick Guide
- Douglas-fir Tussock Moth – 2015 Quick Guide
- Western Balsam Bark Beetle
Aspen
- Aspen and Popular Leaf Spots (203 KB PDF)
- Cytospora Canker (87 KB PDF)
- Poplar Borer (115 KB PDF)
- Oystershell Scale (78 KB PDF)
- Aspen Scale (305 KB PDF)
- Sudden Aspen Decline (2.3 MB PDF)
Piñon Pine
- Common Piñon Pine Pests Fact Sheet (297 KB PDF)
Juniper
- Juniper Borer (255 KB PDF)
- Western Cedar Bark Beetle Beetle (61.3 KB PDF)
The 2018 Report on the Health of Colorado’s Forests (2.1 MB PDF) provides an overview of insect and disease conditions in all of the state’s forests.
2018 Insect & Disease Activity in Colorado Forests
Pass your cursor over the map below to zoom in on an area
Forest Insect & Disease Aerial Survey
CSFS Forest Entomologist Dr. Dan West has produced an Esri Story Map for the 2018 Forest Health Report, which tells the story of how data was collected to compile the report, and offers users an interactive way to find out about forest conditions in their area.
Use your cursor to zoom in/out and navigate around the map to display Eagle, Grand and Summit county information.