CBS Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands;
Persoonia. 2009 Jun;22:38-48. doi: 10.3767/003158509X424333. Epub 2009 Feb 23.
A common leaf spot disease occurring on Eucalyptus cladocalyx and E. lehmannii in the Western Cape Province of South Africa is known from literature to be caused by the fungus Coniothyrium ovatum, which is a pathogen native to several eucalypts in Australia. Recent collections have shown that Australian material identified as C. ovatum is morphologically and phylogenetically distinct from the South African specimens, and that all these taxa would be better accommodated in the genus Teratosphaeria. South African specimens previously identified as C. ovatum were found to represent two species that co-occur in the same leaves and even spots and are described here as T. juvenalis and T. verrucosa. Furthermore, a fresh collection of T. ovata from E. phoenicea in Australia, is distinguished morphologically and phylogenetically from similar, newly described taxa such as T. veloci on E. miniata, and Readeriella dimorpha, which is also placed in Teratosphaeria. Although these leaf pathogens appear to be of minor economic importance, they are morphologically similar to two serious eucalypt canker pathogens, namely T. gauchensis and T. zuluensis, which predominantly cause stem cankers, but could also be found occurring in leaf spots on their own, or in association with some of the other species treated here. Further research is, therefore, required to develop molecular detection techniques for these taxa to enable researchers to rapidly distinguish the minor pathogens from the more serious quarantine pathogens that co-occur on leaves.
一种常见的叶斑病，发生在南非西开普省的桉树 cladocalyx 和 E. lehmannii 上，根据文献记载，这种病是由真菌 Coniothyrium ovatum 引起的，这种真菌是澳大利亚几种桉树的病原体。最近的采集表明，澳大利亚被鉴定为 C. ovatum 的材料在形态和系统发育上与南非标本明显不同，所有这些分类群在 Teratosphaeria 属中会得到更好的容纳。以前被鉴定为 C. ovatum 的南非标本被发现代表两种在同一叶片甚至同一斑点中共存的物种，这里将它们描述为 T. juvenalis 和 T. verrucosa。此外，从澳大利亚的 E. phoenicea 采集的新鲜 T. ovata 标本在形态和系统发育上与类似的新描述的分类群，如 E. miniata 上的 T. veloci 和 Readeriella dimorpha 不同，后者也被归入 Teratosphaeria 属。尽管这些叶病原体的经济重要性似乎较小，但它们在形态上与两种严重的桉树溃疡病原体，即 T. gauchensis 和 T. zuluensis 相似，这两种病原体主要引起茎溃疡，但也可能在自身的叶斑中或与这里处理的其他一些物种一起发生。因此，需要进一步研究这些分类群的分子检测技术，以使研究人员能够快速区分次要病原体和共同发生在叶片上的更严重的检疫病原体。
