Laminated Root Rot Fruiting Body

Infection rarely extends more than 1 m up the stem in living trees.

Laminated root rot fruiting body. The good the bad and the ugly dr. Infected stumps and wood with this fungus have brown mycelium that contains setae. Pathogen mycelium often covers infected roots. The exposed surface of the fruiting body is poroid.

A fruiting body several feet from the trunk may indicate an early infection where only one root has been infected. Glaeserglaeser center of forest mycology research u s. Laminated root rot poses a major threat to its most important host second growth douglas fir. Laminated root rot is one of the most damaging root disease amongst conifers in northwestern america and true firs douglas fir mountain hemlock and western hemlock are highly susceptible to infection with p.

These reddish brown hair like projections. The fruiting bodies produce spores that are dispersed by the wind and end up creating new pockets of infection. The number and location of fruiting bodies and swelling of the trunk are key indicators to the degree of internal root and stem decay. Forest service northern northern research station research station madison madison.

The early stage of decay sometimes appears as a red brown stain visible on fresh stump tops or cross sections of major roots fig. Hence the common name laminated root rot. The pores are small and somewhat irregular in outline. Laminated root rot should be considered a disease of the site.

Laminated root rot phellinus weirii and phellinus sulphurascens fruiting bodies of phellinus weirii. That is established mycelia of this fungus are essentially permanent so the best course is to minimize losses by managing tree species that can be expected to have better survival on infested sites. The long fibrous stem is encircled by a thin membranous ring. Laminated root rot fruiting bodies beth willhite they are flat gray brown to chocolate brown pore covered crusts that typically form near the ground on the undersides of infected windthrown trees.

Laminated root rot also known as yellow ring rot is caused by the fungal pathogen phellinus weirii. Microscopic brown fungal hairs called setal hyphae which are diagnostic for this fungus often cover the laminated rot. Flattened conks develop on the undersides of roots or logs.