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Problem: Powdery Mildew of Turf - Erysiphe graminis
Host Plants: Kentucky bluegrass (most susceptible), bermudagrass, red fescue, others.
Description: Individual blades look like they have been dusted with flour. Closer inspection reveals a white, powdery growth primarily on the upper surface of the leaves. As the disease progresses, turfgrass blades wither and die. Kentucky bluegrass grown in the shade is the most likely to be affected. High relative humidity, poor air movement, and air temperatures around 65°F favor disease development. Disease normally occurs in August to September.
Recommendations: Fertilization will often allow the turf
to outgrow the disease. Since this disease often appears in late August, fertilization is
a good choice. Pruning of trees and shrubs to increase light and air movement can also be
helpful. Chemical control is effective but often unnecessary.
References:
1. Lawn Disease in the Midwest, North Central Regional Extension Publication No. 12
Last Update: 03/28/2003
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