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P&PDL Picture of the Week

Powdery Mildew on Turf

Karen Rane, Botany and Plant Pathology, Purdue University

Powdery mildew has recently appeared on turfgrass in the Lafayette area. This fungal disease is favored by cool spring or fall weather, and is common in shaded areas. The outbreak in these photos is occuring on Kentucky bluegrass bordering a foundation planting on the northeast side of a house, where it is shaded for most of the day. High nitrogen levels also favor disease development. Powdery mildew rarely causes significant damage to turf, but the white, powdery growth on the leaf blades is quite visible, resulting in questions from homeowners. For more information on powdery mildew in turf, refer to BP-111-W Powdery Mildew (PDF 199K) by Dr. Richard Latin.

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Powdery Mildew on Turf Close-up of Powdery Mildew on Turf
Powdery Mildew on Turf

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Last updated: 2 May 2002/tlm.
The Plant & Pest Diagnostic Laboratory at Purdue University.