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 READ MORE http://www.bellaonline.com/articles/art11754.asp
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 READ MORE http://www.allaboutrosegardening.com/Downy-Mildew.html
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 READ MORE http://www.extension.purdue.edu/extmedia/BP/BP-68-W.pdf