Laminated Root Rot Resistant Trees

As previously discussed p.

Laminated root rot resistant trees. There is a range of resistance. There are usually discrete infection centers with this disease. Canopy gaps created by laminated root rot expand slowly resulting in a more diverse stand structure and at times a more diverse plant species composition as resistant or non host trees shrubs and forbs are released or become established from the infection center outward following the slowly expanding fringe of dying host trees. Laminated root rot by favoring disease resistant tree species.

Surveys indicate approximately 5 of the area of highly susceptible host types in oregon and washington is out of production because of this disease. Decayed roots separate at the annual rings like pages in a book. 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. Diseased trees often fall over because most roots have decayed.

Several approaches can be used. Laminated root rot is a major management problem in some of the most productive forests in north america. As described above infection centers can be regenerated to resistant species. However most mortality occurs where infections are aggregated also known as infection centers.

Weirii a few species of plants such as western white pine and lodgepole pine are. Forest structure and composition effects of laminated root rot. Infections are both dispersed and aggregated in stands. Hence the common name laminated root rot.