In August 2018, a tree-of-heaven (Ailanthus altissima) showing symptoms of powdery mildew was found in Pisa, Italy. Morphological characteristics of the anamorph and molecular sequence analysis of the internal transcribed spacer region of rDNA verified the fungus as Erysiphe platani. In a pathogenicity test, powdery mildew patches were present on leaf surfaces 2 weeks after inoculation with the isolate. This is the first report of E. platani causing powdery mildew on ailanthus in the Mediterranean basin. The fungus, whose historical host range was confined to the genus Platanus, has expanded its host range to Ailanthus in Italy.

中文翻译：

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关于意大利地中海盆地天堂树臭椿（Ailanthus altissima）中由白桦（Erysiphe platani）引起的白粉病的首次报道

2018年8月，在意大利比萨发现了显示白粉病症状的天堂树（Ailanthus altissima）。rDNA的无性型的形态学特征和内部转录的间隔区的分子序列分析证实了该真菌为白金龟。在致病性测试中，接种隔离株2周后，叶片表面出现了白粉病斑块。这是大肠埃希氏菌在地中海盆地的臭椿上引起白粉病的首次报道。这种真菌的历史寄主范围仅限于Platanus属，现已将其寄主范围扩展至意大利的臭椿。