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Powdery mildew develops primarily on Kentucky
bluegrass in shaded areas with poor air circulation. Infected grass
is easy to identify, as grass appears whitish in color. High nitrogen
levels tend to favor disease development. Although the white, powdery
growth on the leaf blades is quite visible, Powdery Mildew rarely causes
significant damage to turf and thus control with a fungicide is not
routinely recommended. Choose shade tolerant grass and follow shade
lawn management practices.
--Gail Ruhl, Interim P&PDL Director, Botany and Plant Pathology, Purdue University
Figures 1 & 2 courtesy of Joseph W. Rimelspach and Michael
Plant and Pest Digital Library and Digitally Assisted Diagnosis, Purdue University, West Lafayette, Indiana.