The genus Diaporthe is a cosmopolitan group of fungi that includes important plant pathogens, endophytes and saprobes with the ability to colonize a wide range of plant hosts. Pathogenic Diaporthe species are often reported to cause symptoms like dieback, stem canker, leaf spots, fruit rots and seed decay resulting in important economic losses on several crops. However, the occurrence of Diaporthe species associated with forest hosts and their pathogenic potential is poorly understood. We studied a collection of Diaporthe isolates obtained from a survey of forest‐related fungal diseases on Eucalyptus globulus, Pinus pinaster and Quercus suber in Portugal. Several Diaporthe species (D. eres, D. rudis, D. crousii, D. malorum and D. foeniculina) were found among the studied hosts. Pathogenicity trials were conducted to analyse the pathogenic potential and the ability to colonize putative new hosts. We report the occurrence of D. eres on P. pinaster in Portugal and a new host association with Q. suber. Additional new host reports were as follows: D. malorum and D. crousii on E. globulus, D. foeniculina on Q. suber and D. rudis on P. pinaster. Overall, Diaporthe species were shown to have low pathogenic impact on forest hosts under non‐stress conditions, despite their capability to colonize different hosts during the pathogenicity trials.

中文翻译：

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在葡萄牙的桉树，松树松和栎属中都存在Diaporthe物种

Diaporthe属是一个世界性的真菌群，包括重要的植物病原体，内生菌和腐殖质，能够在多种植物宿主中定殖。据报道，致病的臭port属物种通常会引起诸如枯死，茎枯萎，叶斑，果实腐烂和种子腐烂等症状，从而导致几种农作物的重大经济损失。但是，人们对与森林寄主相关的Dia虫物种的发生及其致病潜力了解得很少。我们研究了从对桉树，松树松和栎的森林相关真菌病的调查中获得的Diaporthe分离物的集合。在葡萄牙。几个Diaporthe种（D. ERES，D. rudis，D. crousii，D. malorum和D. foeniculina）所研究的主机之间被发现。进行了致病性试验，以分析其潜在致病性和定殖新宿主的能力。我们报告的发生D. ERES上P.松树在葡萄牙，并用新的主机关联Q.苏伯。其他新的宿主报告如下：D。malorum和D. crousii在E. globulus上，D. foeniculina在Q. suber和上。D. rudis在P. pinaster上。总体而言，尽管在致病性试验过程中，Diaporthe物种能够在不同胁迫条件下定居在不同的宿主上，但它们在非胁迫条件下对森林宿主的致病影响较低。