Adam H. Putnam, Commissioner - Richard D. Gaskalla, Director

Downy Mildew of Impatiens


An Impatiens bed in the landscape with downy mildew. Leaves fall off and plants die in later stages. Early stages are subtle.

An Impatiens bed in the landscape with downy mildew. Leaves fall off and plants die in later stages. Early stages are subtle.
Photo courtesy of M. Moyer

Terminal leaves of an Impatiens plant infected with Plasmopara obducens. Note slightly chlorotic and curled appearance with white fuzz on the underside.

Terminal leaves of an Impatiens plant infected with Plasmopara obducens. Note slightly chlorotic and curled appearance with white fuzz on the underside.
Photo courtesy of T. Schubert

Closer view of the white fuzz made up of sporangia and sporangiophores of P. obducens, the downy mildew pathogen.

Closer view of the white fuzz made up of sporangia and sporangiophores of P. obducens, the downy mildew pathogen.
Photo courtesy of T. Schubert

Downy Mildew of Impatiens Updates new