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<p>During a bioblitz at the Adkins Arboretum (Maryland, US.), a muscadine grape (<i>Vitis rotundifolia</i>) infected with downy mildew was observed and collected. Morphological analysis and a phylogenetic tree inferred from <i>cox</i>2 and 28&#xa0;S revealed the downy mildew was not <i>Plasmopara viticola</i> as expected but rather a strain of <i>P. ampelopsidis</i>, which previously has only been reported from <i>Ampelopsis grandulosa</i> var. <i>brevipedunculata</i>, <i>Vitis vinifera</i>, and a <i>Vitis</i> hybrid. Herein we describe the morphology of the collected downy mildew, present the molecular data confirming its identity, report a new host for <i>P. ampelopsidis</i>, and relate these findings to the current classification of downy mildew species affecting hosts in the Vitaceae.</p>

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Muscadine grape (Vitis rotundifolia) as a new host for the downy mildew Plasmopara ampelopsidis

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • William J. Davis,
  • Catalina Salgado-Salazar

摘要

During a bioblitz at the Adkins Arboretum (Maryland, US.), a muscadine grape (Vitis rotundifolia) infected with downy mildew was observed and collected. Morphological analysis and a phylogenetic tree inferred from cox2 and 28 S revealed the downy mildew was not Plasmopara viticola as expected but rather a strain of P. ampelopsidis, which previously has only been reported from Ampelopsis grandulosa var. brevipedunculata, Vitis vinifera, and a Vitis hybrid. Herein we describe the morphology of the collected downy mildew, present the molecular data confirming its identity, report a new host for P. ampelopsidis, and relate these findings to the current classification of downy mildew species affecting hosts in the Vitaceae.