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Forest & Tree Health
While it may be easy to distinguish between a healthy and sick tree, it is harder to define the health of your woods. Woodland health is an overall condition. Many very healthy woodlands have individual dead or dying trees. Some foresters would even argue that to really be “healthy” a woodland must have dead and dying trees which provide the food and shelter used by many kinds of woodland animals.
However, it is natural for a woodland owner to get concerned when several trees start dying, or when a homeowner’s lawn tree turns brown. You may want to know what is going on, if there is a reason to be concerned or useful actions to be taken.
This web page is meant to help you find some basic information about insects, diseases and other things that may injure trees in Oregon’s woodlands. It can also direct you to resources that can help you diagnose or identify your problem.
General Publications and Resources
An Introduction to Forest Protection (EC 1253)
Abiotic Injury to Forest Trees (EC 1501)
Needle Diseases in Oregon Coast Range Conifers (EC 1515)
Managing Tree Wounding and Stem Decay in Forests (EC 1519)
Swiss Needle Cast of Douglas-fir (EC 1615E)
Sudden Oak Death (EC 1607E)
Stop the Spread of Sudden Oak Death (EC 1608)
Sudden Oak Death: A Guide for Forest Managers (EM 8877)
Managing Insects and Diseases of Oregon Conifers (EM 8980)
Diseases and Insect Pests of Pacific Madrone (EC 1619)
Dead and Dying Tops on Douglas-fir (ODF Publication)
Drought and Conifer Mortality (ODF Publication)
Tree Susceptibility to Beetle Outbreaks Following Blowdown (ODF Publication)
Managing Blowdown Following Major Windstorms ODF POWERPOINT PRESENTATION (will download, large file)
The Oregon Department of Forestry webpage provides access to a useful publication series Insect and Pest Notes. The Notes address problems commonly from all around Oregon, and contain descriptions and photos which may be helpful in identifying or confirming a problem. Caution: The list may cause the uninitiated to despair “all is lost.”
(Summary compiled by Hal Hagglund, Master Woodland Manager)