Macrophoma菌株間のスギに対する病原性および材変色性の差異

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Macrophoma was isolated frequently from the diseased parts, which were induced by Guignardia dieback (Guignardia cryptomeriae SAWADA=M. sugi HARA), and discolored wood of sugi (Cryptomeria japonica D. DON). To compare the pathogenicity and wood-discoloring ability among Macrophoma isolates, eleven of them were inoculated into the stems and branches of five-year-old sugi trees. Although none of the trees were killed by the fungus, necrosis of the bark and cambium, and wood discolorations appeared. Differences were observed in the pathogenicities and wood discoloring-abilities (indexed by the lengths of bark lesions and discolored woods) among the isolates. Correlations were not observed between the hyphal-growth rate on potato-dextrose-agar and the pathogenicity of each isolate. Outbreaks of Guignardia dieback seem to be affected by environmental conditions more than by the pathogenicity of the fungus.
1992-03-01