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Rights Statements InC/1.0 , Open Access
Journal article
Root diseases in Eastern Oregon and Washington
Northwest science., Vol.75, pp.38-45
2001
Handle:
https://hdl.handle.net/2376/979
Abstract
Root diseases are important natural disturbance agents affecting all tree species and all forest ecosystems of the Pacific Northwest. They influence stand structure, density, composition, function, and yield. The root diseases of greatest concern in eastern Washington and Oregon, USA are annosus root disease (caused by Heterobasidion annosum), Armillaria root disease (caused by Armallaria ostoyae), laminated root rot (caused by Phellinus weirii), and black stain root disease (caused by Leptographium wageneri). For these diseases, some information is available on root disease ecology, population dynamics, biology of the pathogens, and the natural processes that regulate them. Less is known about disease effects at the watershed or landscape level or how diseases interact with other disturbances and how they respond to management strategies. Decision support, such as the Western Root Disease Model, is being developed. In response to a shift in forest species and structure following a century of fire suppression and partial cutting, root diseases are believed to have spread causing more inoculum on more sites than existed in historical times. Stand management to restore historical vegetation conditions may intensify disease; however, in cases where diseased stands are converted to seral species, incidence and severity of root diseases will likely decline. Treatments that retain high stocking of host species, or allow host regeneration, will likely result in increased levels of root diseases because inoculum remains on the site. Spore infections may increase with partial cutting where stumps are not chemically treated. Disturbance increases activity of some insects, which may act as vectors of root disease pathogens.
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Details
- Title
- Root diseases in Eastern Oregon and Washington
- Creators
- W. G. Thies (Author)
- Publication Details
- Northwest science., Vol.75, pp.38-45
- Academic Unit
- Northwest Science
- Publisher
- WSU Press
- Identifiers
- 99900502936801842
- Copyright
- In copyright ; openAccess ; http://rightsstatements.org/vocab/InC/1.0/ ; http://purl.org/eprint/accessRights/OpenAccess
- Language
- English
- Resource Type
- Journal article