2022 Fiscal Year Final Research Report

A study to clarify the factors in disease occurrence and resistant mechanism of resinous canker of Thujopsis dolabrata var. hondai

Research Project

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Project/Area Number	19H03010
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 40010:Forest science-related
Research Institution	Forest Research and Management Organization
Principal Investigator	Ichihara Yu 国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員等 (10353583)
Co-Investigator(Kenkyū-buntansha)	相川拓也国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員等 (90343805) 升屋勇人国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員等 (70391183)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	ヒノキアスナロ / 漏脂病 / エチレン
Outline of Final Research Achievements	Resinous canker on Hiba cypress (Thujopsis dolabrata var. hondai) stems is a major problem in the Hiba cypress plantations. Nevertheless this disease has been found more than one hundred years ago, the disease mechanism has not been fully clarified. In this study, we found that ethylene production by the pathogenic fungi, Cistella japonica, has a role causing this disease. In a diseased forest, we clarified that disease rate could be kept at low frequency for several years by thinning treatments. It was clarified that low disease rate might be caused by low density of pathogenic fungi accompanied with low wetness of bark by thinning treatments.
Free Research Field	森林病理学
Academic Significance and Societal Importance of the Research Achievements	ヒノキ・ヒバ漏脂病が発見されて以来1世紀が経過するにもかかわらず発病機構が十分に明らかにされてこなかったが、本研究により病理学的に発病機構が明らかにされた。ヒバ人工林における被害抑制を強度間伐という施業により達成できたことは、漏脂病によってそがれたヒバ人工造林促進意欲を取り戻すことにつながり、ヒバ人工造林が過疎に直面した地域にとって希望のある地域特産品産業となることに貢献する。