A report of dieback and mortality of elm trees suspected of Dutch elm disease in Hokkaido, Japan
A report of dieback and mortality of elm trees suspected of Dutch elm disease in Hokkaido, Japan
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DOI：
10.1080/13416979.2019.1679942
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发表时间：
2019-10
影响因子：
1.5
通讯作者：
Toshizumi Miyamoto;H. Masuya;A. Koizumi;Takehiro Yamaguchi;M. Ishihara;Y. Yamaoka;I. Okane;Mariko Shizuki;M. Ôhara
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文献类型：
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作者：
Toshizumi Miyamoto;H. Masuya;A. Koizumi;Takehiro Yamaguchi;M. Ishihara;Y. Yamaoka;I. Okane;Mariko Shizuki;M. Ôhara
摘要大叶榆的死亡率突然增加。2014-2016年发生在日本北海道札幌市的日本榆树。死亡和垂死的树木集中在一个狭窄的区域内（最大距离约为300米）。估计受影响的树龄为36-186年。上世纪50年代，北海道曾发生过榆树枯死的大规模爆发。当时，据报道，榆树皮甲虫（Scolytus esuriens）是造成这种疾病传播的原因;然而，这种疾病的实际真菌原因仍然不清楚。从那时起，日本没有报道过日本榆树顶枯病的爆发。在我们的研究中，S.在死亡或垂死的日本榆树的走廊或树皮中发现了esuriens成虫和幼虫。从S. esuriens和廊道木材中分离到的细菌鉴定为榆蛇口菌Ophiostoma ulmi和榆蛇口菌O.新乌尔米。在这些被甲虫袭击的树木周围，有许多树木已经变得虚弱，树枝枯萎。因此，怀疑是荷兰榆树病导致了日本榆树枯梢病的发生。
ABSTRACT 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.