Field surveys conducted in two urban green spaces in Athens (Greece) revealed the presence of -related diseases on and x trees. Declining trees showed a range of disease symptoms including root rot, stem bleeding cankers and extensive canopy dieback. Since there is little information about the etiology of these diseases, a study was conducted from 2016 to 2021 to define the main pathogens involved. A total of 71 isolates were obtained from bark tissues and rhizosphere samples collected from symptomatic plane trees. Based on morphological traits and DNA sequence data, isolates were identified as (11 isolates) and (60). Over a five-year period 41% of trees associated with infections died and were removed from the park. Pathogenicity tests confirmed that all species including used for comparison, are pathogenic on both and x trees. was shown to be the most aggressive species on both and x . was the dominant species, whereas was associated with a few trees. Our finding has contributed to expanding knowledge on the host and geographic range of , an invasive pathogen with a high potential for diffusion in Mediterranean regions and highlights the importance of enhancing biosecurity measures to prevent and limit the spread of invasive pathogens in urban and natural ecosystems.

中文翻译：

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烟草疫霉和地中海疫霉菌：对希腊城市绿地悬铃木和 P. x acerifolia 的生物安全威胁

在雅典（希腊）的两个城市绿地进行的实地调查显示，x 和 x 树上存在与 相关的疾病。衰弱的树木表现出一系列疾病症状，包括根腐病、茎流血溃疡和大范围的树冠顶枯病。由于有关这些疾病病因的信息很少，因此在 2016 年至 2021 年期间进行了一项研究，以确定所涉及的主要病原体。从有症状的梧桐树收集的树皮组织和根际样本中总共获得了 71 株分离株。根据形态特征和DNA序列数据，分离株被鉴定为（11个分离株）和（60个）。五年内，41% 与感染相关的树木死亡并被从公园中移走。致病性测试证实，所有物种（包括用于比较的物种）对 和 x 树均具有致病性。被证明是在 和 x 上最具攻击性的物种。是优势种，而与少数树木相关。我们的发现有助于扩大对这种入侵病原体的宿主和地理范围的了解，这种病原体在地中海地区具有很高的传播潜力，并强调了加强生物安全措施以预防和限制入侵病原体在城市和自然生态系统中传播的重要性。