Symptom Development of the Resinous Stem Canker Caused by Inoculation with Cistella japonica onto Chamaecyparis obtusa

概要

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Cistella japonica was inoculated onto the stems of young Chamaecyparis obtusa trees, and the development of external and internal symptoms was investigated for five years. Most lesions started exuding resin from May to July during the first growing season after inoculation, while a few lesions started exuding resin during the second growing season. Resin exudation lasted for two successive years on most lesions, and during successive three, four, or five years on some lesions. Resin exuded excessively in the secondary phloem of the lesions and resin cysts frequently developed there. The lesions where cambial tissue was necrosed occupied 18% of all the lesions and the resinous areas expanded to a larger size than those where resin simply exuded in the phloem. Ci. japonica was reisolated from some inoculated lesion tissues at a high frequency. The isolation frequency of the fungus from some lesion tissues two and more years later was zero or low and that of Cryptosporiopsis abietina was high.
一般社団法人日本森林学会の論文
1999-05-16