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. 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.
Read more about Laminated Root Rot: Symptoms and Signs, Discovery, Disease Cycle and Transmission, Management, Economic Importance
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