Janna Beckerman Department of Botany and Plant Pathology, Purdue University BP-68-W Figure 1. The different strains of downy mildew can be very host specific, or it can infect many members of

Downy Mildew is a common rose fungus that will cause significant defoliation of your rose plants. This fungus affects roses throughout the U.S. It is most prevalent in the Spring, in moist coastal reg

Overview Downy mildew can appear on any type of plant but the cause of this disease is different depending on the type. When downy mildew forms on roses it is caused by the fungus "peronospora sparsa

Michelle Ullman BellaOnline's Roses Editor Downy mildew This serious fungal infection appears as purplish brown spots and blotches on the leaves of the rosebush. As the disease progresses, the bl