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laminated root rot
Laminated root rot also known as yellowing ring rot is caused by a fungal pathogen ''Phellinus weirii''. Laminated root rot is one of the most damaging root disease amongst conifers in northwestern America and affects mostly fir trees and cedars.〔(【引用サイトリンク】author=Natural Resources Canada ) 〕 Douglas fir, Mountain hemlock, Western hemlock, Grand fir, and Pacific silver fir are highly susceptible to infection with P. Weirii. A few strains of plants such as Western white pine and Lodgepole pine are tolerant to the pathogen while Ponderosa pine is resistant to it. Only hardwoods are known to be immune to the pathogen and therefore are not infected with yellow ring rot.〔Hadfield, J.S. and D.W. Johnson, Laminated Root Rot. USDA Forest Service -Pacific Northwest Region, 1977.〕
==Symptoms and Signs==
Laminated root rot mainly attacks Douglas-fir, Mountain hemlock, Western hemlock, Grand fir, and Pacific silver fir. The disease infects trees between 6 years and their year of rotation (the period of years between when a forest stand is established and when it receives its final harvest).〔Data sheets on quarantine pests: Phellinus weirii. In EPPO quarantine pest Retrieved from http://www.eppo.org/QUARANTINE/fungi/Phellinus_weirii/INONWE_ds.pdf〕 Diagnostic symptoms include crown yellowing and thinning, distress of cones, red brown stained outer heartwood, and separation of annual rings. Also, plants infected with laminated root rot are usually in patches or groups since the disease is spread within a short range.〔Buckland, D.C.; Molnar, A.C.; Wallis, G.W. (1954) Yellow laminated root rot of Douglas fir. Canadian Journal of Botany 32〕 Infected or decayed roots break close to the root forming “root balls.” 〔 Laminated root rot is frequently detected during ground surveying when canopy openings and standing dead and fallen trees are observed.〔
Signs of Laminated root rot are the red fungal hairs between sheets of decomposing wood and also the buff colored mycelia on the outside of the roots.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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