UMass Extension Landscape, Nursery and Urban Forestry Program

Impatiens Downy Mildew Resources

Downy Mildew

Downy mildew of impatiens, Plasmopara obduscens, has been reported sporadically since 2004 but it wasn’t until 2011 that widespread outbreaks were observed in landscapes in Massachusetts.

Refer to the following page for comprehensive information on impatiens downy mildew, as well as some insight on planning for the future.

Impatiens Downy Mildew - UMass Greenhouse Crops and Floriculture Program

Poster for Garden Retailers:

Impatiens Downy Mildew in Home Gardens & Landscapes (PDF file size 2.52 MB) (measures 11in x 17in)