Inoculations with fungi isolated from lesions of the resinous stem canker of Chamaecyparis obtusa

Nishigaki Shintarou, Takeshita Tutomu

doi:10.20660/applfor.8.0_205

In order to confirmthe causal fungus of the resinous stem canker of Chamaecyparis obtusa, inoculation experiments with some fungi isolated from the lesions, Cistella japonica, Cryptosporiopsis abietina, Amylostereum laevigatum, and non-identified fungi, were conducted onto the tree. Although resinous exudation was observed around the inoculated points inoculated with all of the fungi and even non-inoculated control one and two years after inoculation, fresh resin continously exuded for seven years from the lesion cause by inoculation with C. japonica. Seven years after inoculation, resin cysts were observed in inner barks of the lesions and the cambial texture were necrosed around the inoculated points. These external and internal symptoms were similar to those observed on natural lesions of the resinous stem canker. C. japonica was reisolated from the inoculated lesion tissues and isolation frequency of the fungus was higher in lesions where fresh resin continously excuded. No symptoms of the resinous stem canker, however, were induced by inoculations with the other fungi. As the results of inoculations, C. japonica was considered to be causal fungus of the disease.

Inoculations with fungi isolated from lesions of the resinous stem canker of Chamaecyparis obtusa

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