Laminated Root Rot

Based on the douglas fir that was harvested from state trust lands between july 2009 and june 2011 the lower estimate of losses 5.

Laminated root rot. Small trees die standing and bigger ones fall over. It causes significant losses in growth. Weirii a few species of plants such as western white pine and lodgepole pine are. Trees that have blown over and have roots that are decayed and stubbed off.

Avoid building near centers of root rot infection. Laminated root rot has major impacts on the income producing land of the washington department of natural resources dnr causing economic losses of between 5 percent and 15 percent to douglas fir forestry. It is restricted in distribution to the pacific northwest and inland empire area but it occurs on a variety of important conifers there and causes very significant losses 60 million cu. It leads to expanding centers of mortality.

Laminated root rot also known as yellow ring rot is caused by the fungal pathogen phellinus weirii 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. Laminated root rot can cause undesired reductions in stand densities by causing high levels of mortality and may limit the species of trees that can be grown to a large size on a site. Expected to have better survival on infested sites. An abnormally heavy crop of cones may be produced.

This report gives an overview of the dis ease as it occurs in the pacific northwest in canada and the united states. Laminated root rot is a typical root and butt rot. Laminated root rot caused by phellinus weirii murr gilb is a serious root disease affecting douglas fir and other commercially important species of conifers in northwestern north america. Microscopic brown fungal hairs called setal hyphae which are diagnostic for this fungus often cover the laminated rot.

Surveys indicate approximately 5 of the area of highly susceptible host types in oregon and washington is out of production because of this disease. This report gives an overview of the dis ease as it occurs in the pacific northwest in canada and the united states. Construction activity usually worsens the situation and can lead to tree failures and property loss. 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.

Ground fire severity may increase as a result of the abundant down wood in infection areas. Laminated root rot is estimated to infest at least 739 000 acres in. On standing trees foliage in the crown will thin and turn yellow or chlorotic. Laminated root rot laminated root rot caused by the fungus phellinus poria weirii is responsible for an annual estimated volume loss of 32 million cubic feet in the west side douglas fir type.

On recreational and. Flattened conks develop on the undersides of roots or logs.