南美蟛蜞菊為一種常見於公共綠地的觀賞性地被植物之一，在臺灣同時也是一種外來入侵種。於臺北市，在此植物上發現了露菌病之病徵，而後基於宿主、形態學以及核糖體大亞基RNA基因(LSU)序列分析，將該菌種鑑定為Plasmopara sphagneticolae。本文亦針對此卵菌隨其宿主自夏威夷最可能的輸入途徑進行討論。

Sphagneticola trilobata (Asteraceae) is one of the most common ornamental groundcover plants in public green spaces and also invasive in Taiwan. Downy mildew symptoms were found on this plant in Taipei City. Based on the host, mor-phology and ribosomal large subunit RNA gene (LSU) sequence analysis, the associated oomycete was identified as Plas-mopara sphagneticolae. The most likely route of introduction of this oomycete together with its host from Hawaii is dis-cussed.