Insect and Disease
In addition to fire; insects, diseases, and weeds act as important disturbance agents in Utah forest ecosystems. Fire suppression has altered the occurrence, severity, and intensity of fires. This may have contributed to increased insect and disease activity in certain forest types. Noxious and invasive weeds in Utah are spreading at an alarming rate, displacing native species and disrupting the normal functioning of ecosystems.
Insects and diseases play an important role in the function and nutrient cycling of forest ecosystems. In a healthy forest, endemic levels of insects and diseases remove weakened and stressed trees, thus thinning the forest and reducing competition for light, water, and nutrients. Dead trees provide habitat for a variety of wildlife species. For example, raptors use dead trees for perches and decayed trees provide homes for cavity-nesting birds. The vigor of trees is an important factor in determining their susceptibility to attack by insects or diseases. Forests that are over-mature or over-dense often become susceptible to insect and disease outbreaks, creating considerable fuel and increasing the susceptibility of stands to fire.
Insect and Disease Information
- Using MCH to Protect Trees and Stands from Douglas-fir Beetle Infestation
- Utah Forest Insect and Disease Conditions Report 2015
- Utah Forest Insect and Disease Conditions Report 2013 and 2014
- Utah Forest Insect and Disease Conditions Report 2012
- Utah Forest Insect and Disease Conditions Report 2011
- Bark Beetles - Are Your Trees at Risk?
- Black Pineleaf Scale Leaflet
- Douglas Fir Beetle Leaflet
- Ips Engraver Beetle Leaflet
- Mountain Pine Beetle Leaflet
- Pinyon Engraver Beetle Leaflet
- Pitch Mass Borer Leaflet
- Poplar Borer Leaflet
- Spruce Beetle Brochure
- US Forest Service Forest Health Protection FHTET Pest Portal Website
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