The Eucalyptus foliar pathogen Teratosphaeria destructans causes severe and widespread damage in South-East Asian and South African plantations. In 2016, leaf blight symptoms resembling those caused by T. destructans were observed in a plantation of a Eucalyptus grandis × E. urophylla hybrid in Sabah, Malaysia. The aims of this study were to confirm the identity of the causal agent as T. destructans and to investigate the genetic structure of isolates associated with this newly detected disease outbreak. Using sequence data of three gene regions, the identity of the pathogen was confirmed as T. destructans. The mating type and microsatellite genotypes of 41 isolates from this Malaysian population were identified and compared with those from previously characterized populations in South-East Asia and South Africa. The Malaysian population had the highest genotypic diversity of any T. destructans population thus far investigated. Both the mating types were found in the collection of isolates, and these were in approximately equal proportions. Although structures linked to a sexual state of the fungus have not been found, sexual reproduction is theoretically possible and could explain the high genetic diversity in the pathogen that must have been accidentally introduced into Malaysia. This is the first record of T. destructans in Sabah and, to the best of our knowledge, in also other parts of Borneo.

中文翻译：

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Teratosphaeria destructans 的基因重组导致马来西亚新疾病爆发

在桉树叶病原体Teratosphaeria destructans导致东南亚和南非种植严重和广泛的破坏。2016 年，叶枯病症状与T引起的症状相似。在桉树 ×  E的种植园中观察到了 destructans。位于马来西亚沙巴的 urophylla杂交种。本研究的目的是确认致病因子的身份为T。 destructans并调查与这种新发现的疾病爆发相关的分离株的遗传结构。使用三个基因区域的序列数据，病原体的身份被确认为T.  破坏者。鉴定了来自该马来西亚人群的 41 种分离株的交配型和微卫星基因型，并与来自东南亚和南非先前特征化人群的那些进行了比较。马来西亚人口有任何的最高基因型多样性牛逼。迄今为止对 destructans人口进行了调查。在分离株集合中发现了两种交配类型，并且它们的比例大致相等。虽然尚未发现与真菌有性状态相关的结构，但理论上有性繁殖是可能的，并且可以解释一定是意外引入马来西亚的病原体的高度遗传多样性。这是T的第一个记录。 destructans在沙巴，据我们所知，也在婆罗洲的其他地方。