Salgado-Salazar C, Romberg M K, Hudelson B
Mycology and Nematology Genetic Diversity and Biology Laboratory, U.S. Department of Agriculture, Agriculture Research Service (USDA-ARS), 10300 Baltimore Avenue, Beltsville MD, 20705, USA.
National Identification Services, Plant Protection and Quarantine, U.S. Department of Agriculture, Animal and Plant Health Inspection Service (USDA-APHIS), 10300 Baltimore Avenue, Beltsville, MD, 20705, USA.
Fungal Syst Evol. 2023 Nov;12:203-217. doi: 10.3114/fuse.2023.12.10. Epub 2023 Sep 22.
Downy mildew is one of the most important diseases of commercial sunflower and other hosts, including ornamental . has historically been identified as the causal agent of this disease, considered a complex of species affecting nearly 35 genera in various tribes. However, with the use of molecular DNA characters for phylogenetic studies, distinct lineages of in the have been identified, confirmed as distinct or segregated as new species. During August of 2022, a downy mildew was observed on potted grown in a retail greenhouse in Jefferson County, Wisconsin, USA. Phylogenetic analyses of the cytochrome c oxidase subunit 2 () and nuclear large subunit ribosomal RNA (nc LSU rDNA) gene regions indicated these sp. isolates are not conspecific with . Based on phylogenetic evidence and new host association, the isolates from are here described as . Diagnostic morphological characters for this new species were not observed when compared with other isolates of or other species found on hosts, and therefore a list of species-specific substitutions in the 2 region are provided as diagnostic characters. As this study corresponds to the first observation of downy mildew in cone flowers, it is recommended to follow the required disease prevention guidelines to prevent outbreaks and the establishment of this plant pathogen in production sites. Salgado-Salazar C, Romberg MK, Hudelson B (2023). , a new species of downy mildew affecting cone flowers () in the United States. : 203-217. doi: 10.3114/fuse.2023.12.10.
霜霉病是商业向日葵和其他寄主（包括观赏植物）最重要的病害之一。历史上，[病原菌名称]一直被认为是这种病害的病原体，它被视为一个影响不同部落近35个属的物种复合体。然而，随着用于系统发育研究的分子DNA特征的应用，[病原菌名称]中的不同谱系已被识别出来，被确认为不同的物种或被分离为新物种。2022年8月，在美国威斯康星州杰斐逊县的一家零售温室中种植的盆栽[植物名称]上观察到了霜霉病。细胞色素c氧化酶亚基2（cox2）和核糖体RNA大亚基（nr LSU rDNA）基因区域的系统发育分析表明，这些[病原菌名称]菌株与[已知病原菌名称]不同种。基于系统发育证据和新的寄主关联，来自[植物名称]的[病原菌名称]菌株在此被描述为[新病原菌名称]。与在[寄主植物名称]寄主上发现的[已知病原菌名称]的其他分离株或其他[病原菌名称]物种相比，未观察到该新物种的诊断形态特征，因此提供了cox2区域中物种特异性替代的列表作为诊断特征。由于本研究是对松果菊霜霉病的首次观察，建议遵循所需的疾病预防指南，以防止该病在生产地爆发和这种植物病原体的定殖。萨尔加多 - 萨拉查C、罗姆伯格MK、哈德森B（2023年）。[新病原菌名称]，一种影响美国松果菊（[植物名称]）的霜霉病新物种。《[期刊名称]》：203 - 217。doi: 10.3114/fuse.2023.12.10 。
需注意，原文中部分病原菌名称、植物名称等未给出具体中文，翻译时用[具体名称]代替，实际应用中需根据准确信息进行替换。
