Impatiens_downy_mildew
Plasmopara obducens
Species of single-celled organism
Plasmopara obducens is a species of oomycete that causes Impatiens downy mildew. It was first described on Impatiens noli-tangere in Germany in 1877. Plasmopara obducens is known from native[where?] species of Impatiens since the 1800s, but outbreaks on cultivated varieties of Impatiens walleriana started in 2003 in the United Kingdom and in 2004 in the United States.[1] The outbreak spread worldwide by 2016.[2]