Canadian Forest Service Publications
Corky root disease of Douglas-fir seedlings: pathogenicity of the nematode Xiphinema bakeri alone and in combination with the fungus Cylindrocarpon destructans. 1977. Sutherland, J.R. Canadian Journal of Forest Research 7(1): 41-46.
Issued by: Pacific Forestry Centre
Catalog ID: 1756
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Growth-room studies were made to determine both, alone and combined, the pathogenicity of the nematode Xiphinemabakeri Williams and the fungus Cylindrocarpondestructans (Zinnsm.) Scholten to Douglas-fir [Pseudotsugamenziesii (Mirb.) Franco] seedlings. Inoculations with 20, 40, and 60 X. bakeri nematodes per seedling resulted in nematode population increases and development of typical corky root disease symptoms. Cylindrocarpondestructans was not pathogenic to seedlings; no consistent synergistic effects were detected when inoculations were made with the nematode and fungus together. It was concluded that X. bakeri is the 'primary' pathogen in corky root etiology.