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<p>The genus <i>Peronospora</i> (Oomycota, Peronosporales) is an obligate biotrophic group of pathogens that cause downy mildew in a wide array of plants of economic or ecological importance. In August 2024, Culver’s root plants (<i>Veronicastrum virginicum</i>) growing at a commercial nursery in Wisconsin, USA, showing symptoms and signs of infection by an unknown downy mildew species, were found. Using morphological and molecular data analyses of one mitochondrial (<i>cox2</i>) and two nuclear (ITS and nrLSU) loci, we identified <i>Peronospora digitalis</i> as the species infecting <i>V. virginicum</i>. <i>Peronospora digitalis</i> primarily infects plants in the genus <i>Digitalis</i>, such as <i>D. purpurea</i>, resulting in significant damage. This study represents the first observation of <i>P. digitalis</i> in a host genus other than its primary one, highlighting the risks these pathogens pose for plant health by increasing the potential for crop losses due to lack of prevention, management and mitigation strategies.</p>

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First observation of Peronospora digitalis causing downy mildew on Culver’s root (Veronicastrum virginicum) in the USA

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • Catalina Salgado-Salazar,
  • Brian Hudelson

摘要

The genus Peronospora (Oomycota, Peronosporales) is an obligate biotrophic group of pathogens that cause downy mildew in a wide array of plants of economic or ecological importance. In August 2024, Culver’s root plants (Veronicastrum virginicum) growing at a commercial nursery in Wisconsin, USA, showing symptoms and signs of infection by an unknown downy mildew species, were found. Using morphological and molecular data analyses of one mitochondrial (cox2) and two nuclear (ITS and nrLSU) loci, we identified Peronospora digitalis as the species infecting V. virginicum. Peronospora digitalis primarily infects plants in the genus Digitalis, such as D. purpurea, resulting in significant damage. This study represents the first observation of P. digitalis in a host genus other than its primary one, highlighting the risks these pathogens pose for plant health by increasing the potential for crop losses due to lack of prevention, management and mitigation strategies.