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A report of dieback and mortality of elm trees suspected of Dutch elm disease in Hokkaido, Japan
Journal of Forest Research ( IF 1.5 ) Pub Date : 2019-10-19 , DOI: 10.1080/13416979.2019.1679942
Toshizumi Miyamoto 1 , Hayato Masuya 2 , Akio Koizumi 1 , Takehiro Yamaguchi 3 , Makoto Ishihara 3 , Yuichi Yamaoka 4 , Izumi Okane 4 , Mariko Shizuki 5 , Masahiro Ohara 5
Affiliation  

A sudden, increased mortality of Ulmus davidiana var. japonica (Japanese elm) trees occurred during 2014–2016 in Sapporo City, Hokkaido, Japan. The dead and dying trees were concentrated within a narrow area (maximum distance of approximately 300 m). The estimated affected tree age was 36–186 years. A previous large-scale outbreak of elm dieback in Hokkaido had been reported in the 1950s. At that time, Scolytus esuriens (elm bark beetle) was reported to be responsible for the spread of the disease; however, the actual fungal cause of the disease remained unclear. Since then, an outbreak of Japanese elm dieback of that scale has not been reported in Japan. In our study, S. esuriens adults and larvae were found in the gallery or bark of dead or dying Japanese elms. Fungal isolates obtained from S. esuriens and from the wood of the galleries were identified as Ophiostoma ulmi and O. novo-ulmi. Many weakened trees with wilting branches were present around these beetle-attacked trees. Therefore, it is suspected that Dutch elm disease caused this occurrence of Japanese elm dieback.



中文翻译:

日本北海道疑似荷兰榆树病的榆树死亡和死亡报告

Ulmus davidiana var的死亡率突然增加。粳稻(日本榆)树木期间北海道札幌市,日本2014- 2016发生。死树和垂死的树木集中在一个狭窄的区域内(最大距离约为300 m)。估计受影响的树龄为36–186年。1950年代以前,曾有报道称北海道发生了大规模的榆树死亡。那时,据报道,食肉硬鳞Scolytus esuriens)(榆树皮甲虫)是造成这种疾病蔓延的原因。但是,尚不清楚该病的真正真菌病因。从那以后,日本还没有爆发过如此规模的日本榆树。在我们的研究中,欧洲栗在死去或垂死的日本榆树的画廊或树皮中发现了成年和幼虫。从S. esuriens和画廊木材获得的真菌分离物被鉴定为Ophiostoma ulmiO. novo-ulmi。这些被甲虫袭击的树木周围有许多枝头枯萎的弱化树木。因此,怀疑是荷兰榆病引起了日本榆树的死亡。

更新日期:2019-10-19
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