Wound inoculation of stems of standing red alder (Alnus rubra) and bigleaf maple (Acer macrophyllum) saplings with 11 isolates of Chondrostereum purpureum resulted in stem cankers, which were measured as an index of virulence. According to this measure, virulence varied significantly among isolates on red alder, but not on bigleaf maple. In both red alder and bigleaf maple, the size of cankers varied significantly among clones (stems arising from the same stump) of inoculated trees. Inoculation of eight hardwood and shrub species with two isolates of C. purpureum demonstrated a wide range of susceptibility of species, as well as considerable intraspecific variation. Generally, large cankers developed on red alder, arbutus (Arbutus menziesii), and Scots broom (Cytisus scoparius), while on bigleaf maple, black cottonwood (Populus balsamifera ssp. trichocarpa), Scouler's willow (Salix scouleriana), grand fir (Abies grandis), Douglas-fir (Pseudotsuga menziesii), and hemlock (Tsuga heterophylla), cankers were small and generally became healed over. Discoloured sapwood was associated with all cankers, and the fungus was readily recovered from the discoloured wood of all inoculated species except grand fir and Douglas-fir.
FRDA Research Report 246 (2897 KB)
To view this document you need the current version of
Adobe Acrobat Reader, available free from the
Adobe Web Site.
Updated July 24, 2015