| |
| | Forest Health - Laminated Root Rot, Yellow Ring Rot - WSU - NRS EXT |
 | | There appears to be two distinct forms, one that causes a root disease in Douglas-fir, grand fir, and hemlock, and another form that causes a butt rot of western redcedar. |
 | | The western redcedar form has only been identified on the east side of the Cascades, although western redcedar on the west side occasionally becomes infected with the Douglas-fir form, to which it is tolerant. |
 | | One 50-year rotation of tolerant, resistant or immune species such as ponderosa pine, western white pine, lodgepole pine, or western redcedar should result in the disease dying out on the site, provided that susceptible trees are not permitted to be reestablished. |
| ext.nrs.wsu.edu /forestryext/foresthealth/notes/laminatedrootrot.htm (1682 words) |
|