The discovery of Cryphonectriaceae and more specifically species related to the Eucalyptus canker pathogen Chrysoporthe cubensis on shrubs and trees in the Melastomataceae, has deepened our understanding of relevant, and potentially globally threatening tree pathogens. Recent isolations of Cryphonectriaceae associated with cankers on Tibouchina spp. in Brazil gave rise to an apparently undescribed species of Chrysoporthe associated with stem and branch cankers that lead to tree death. Cultures of this fungus were subjected to phylogenetic studies based on sequences for the ITS and β-tubulin gene regions. These analyses revealed a novel taxon that is described here as Chrysoporthe puriensis sp. nov., having both sexual and asexual states. Pathogenicity tests on two species of Tibouchina ( T. granulosa , T. heteromalla ) and hybrids of Eucalyptus grandis x E. urophylla showed that Chr. puriensis can infect and cause disease on all of these trees. It is clearly not only damaging on native Tibouchina spp. where environmental conditions are conducive to disease development, but also potentially threatening to non-native Eucalyptus spp., which form the basis of a major plantation forest industry.

中文翻译：

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Chrysoporthe puriensis sp. 十一月 来自 Tibouchina spp。在巴西：对桉树的新威胁

在 Melastomataceae 的灌木和树木上发现 Cryphonectriaceae，更具体地说是与桉树溃疡病病原体 Chrysoporthe cubensis 相关的物种，加深了我们对相关且可能威胁全球的树木病原体的理解。最近分离出与 Tibouchina spp 溃疡病相关的 Cryphonectriaceae。在巴西产生了一种明显未描述的 Chrysoporthe 物种，与导致树木死亡的茎和树枝溃疡有关。基于 ITS 和 β-微管蛋白基因区域的序列，对该真菌的培养物进行了系统发育研究。这些分析揭示了一种新的分类单元，这里被描述为 Chrysoporthe puriensis sp。11月，有性状态和无性状态。两种 Tibouchina ( T. granulosa , T. heteromalla ) 和 Eucalyptus grandis x E. urophylla 的杂交种表明 Chr. puriensis 可以感染所有这些树木并引起疾病。显然，它不仅对本地 Tibouchina spp 有害。那里的环境条件有利于疾病的发展，但也可能威胁到非本地桉树属，它们构成了主要人工林产业的基础。