Ascochyta koolunga (Didymellaceae, Pleosporales) was first described in 2009 (as Phoma koolunga) and identified as the causal agent of Ascochyta blight of Pisum sativum (field pea) in South Australia. Since then A. koolunga has not been reported anywhere else in the world, and its origins and occurrence on other legume (Fabaceae) species remains unknown. Blight and leaf spot diseases of Australian native, pasture and naturalised legumes were studied to investigate a possible native origin of A. koolunga. Ascochyta koolunga was not detected on native, naturalised or pasture legumes that had leaf spot symptoms, in any of the studied regions in southern Australia, and only one isolate was recovered from P. sativum. However, we isolated five novel species in the Didymellaceae from leaf spots of Australian native legumes from commercial field pea regions throughout southern Australia. The novel species were classified on the basis of morphology and phylogenetic analyses of the internal transcribed spacer region and part of the RNA polymerase II subunit B gene region. Three of these species, Nothophoma garlbiwalawardasp. nov., Nothophoma naiawusp. nov. and Nothophoma ngayawangsp. nov., were isolated from Senna artemisioides. The other species described here are Epicoccum djirangnandirisp. nov. from Swainsona galegifolia and Neodidymelliopsis tinkyukukusp. nov. from Hardenbergia violacea. In addition, we report three new host-pathogen associations in Australia, namely Didymella pinodes on S. artemisioides and Vicia cracca, and D. lethalis on Lathyrus tingitanus. This is also the first report of Didymella prosopidis in Australia.

中文翻译：

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澳大利亚豆类植物在豆科中发现的隐性多样性

Ascochyta koolunga（Didymellaceae，Pleosporales）于2009年首次被描述为（Phoma koolunga），并被确定为南澳大利亚州Pisum sativum（田豌豆）的Ascochyta枯萎病的病原体。从那时起，世界上其他地方都没有报道过库鲁冈曲霉，其起源和在其他豆科（豆科）物种上的发生仍然未知。研究了澳大利亚本土，牧场和天然豆科植物的枯萎病和叶斑病，以研究古兰曲霉的可能本土起源。在澳大利亚南部的任何研究地区中，未在具有叶斑病症状的天然，自然化或牧草豆科植物中检测到Ascochyta koolunga，并且从P. sativum中仅回收了一种分离株。然而，我们从整个澳大利亚南部商业豌豆地区的澳大利亚豆科植物的叶斑中，从豆科中分离了五个新种。根据内部转录间隔区和部分RNA聚合酶II亚基B基因区的形态和系统发育分析，对新物种进行分类。这些物种中的三个是Nothophoma garlbiwalawardasp。十一月，Nothophoma naiawusp。十一月 和Nophophoma ngayawangsp。11月，从番泻叶中分离。这里描述的其他物种是Epicoccum djirangnandirisp。十一月 来自Swainsona galegifolia和Neodidymelliopsis tinkyukukusp。十一月 来自紫薇。此外，我们报告了澳大利亚的三个新的寄主-病原体协会，即在青蒿和豌豆上的Didymella pinodes，在山thy豆上的D. lethalis。