Common Tree Diseases and Infestations in Denver
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- APPLE – Diseases: Fire blight bacteria (main disease)
By Ninjatacoshell – Own work, CC BY-SA 3.0
- ASH – Infestation: imminent threat of emerald ash borer, leaf curl aphids, lilac ash borer
Leaf Curl Aphids, Photo By Jeffrey Hahn
Lilac Ash Borer, Steve Katovich, Bugwood.org
- RESIDENTIAL COTTONWOOD TREES: Have an average life expectancy of approximately 30 years. Known to develop Cytospera Canker, Bacterial Wetwood.
Cytospera Canker, Picture attribution: Photo courtesy of Missouri Botanical Garden
Bacterial Wetwood (1), Photo by J. Walla
Bacterial Wetwood (2), Photo by W.R. Jacobi
- ELM – Diseases: European Elm Scale; Elm Leaf Beetle
European Elm Scale, Photo by Whitney Cranshaw, Colorado State University, bugwood.org
Elm Leaf Beetle, Photo by Didier Descouens – Own work, CC BY-SA 4.0
- SPRUCE TREES – Diseases: Ips Beetles / Cooley Spruce Gall
Ips Beetles, By USDA Forest Service – Ashville Archive, USDA Forest Service, Bugwood.org – Crop of File:Ips calligraphus.jpg, CC BY 3.0
Cooley Spruce Gall, CC BY-SA 3.0
- PINE TREES – Diseases: Pine needle scale / Pine wilt nematode
Pine needle Scale, Photo by twitter.com/bberwyn
Pine Wilt Nematode By Simon Hinkley & Ken Walker, Museum Victoria
- LOCUST – Thyronectria Canker / Plant bugs
Thyronectria Canker, Picture attribution: Photo courtesy of Colorado State University Extension
Plant Bug, Photo courtesy of Colorado State University Extension
