Impatiens Downy Mildew
Downy mildew on Impatiens is causing problems in some U.S. landscapes this fall. Downy mildew is a pathogen of both vegetative and seed-produced Impatiens walleriana (the garden impatiens) throughout the world and has been reported in the United States, Canada, Asia, Europe and India. In the United States, downy mildew on Impatiens walleriana was first reported in 1942. Since that time, downy mildew on Impatiens walleriana has occurred sporadically throughout the United States.
Impatiens Down-y but Not Out (PDF)
Downy mildew on impatiens becomes widespread in Michigan landscapes
More information on downy mildew on impatiens
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Downy mildew causing problems on impatiens in the landscape