What is causing much lighter green patches in our otherwise lush dark green lawn?

Asked by Shirley Rotti
Sterling, MA

The lawn has been fertilized and looks great other than the lighter green patches.


Edward Wright

Answered by Edward Wright

Cincinnati, OH

Wright Design, LLC

October 3, 2012


There are several possibilities that can cause the light green lawn areas. The Penn State Center for Turfgrass Science department website indicates the following possibilities:

  • Poa trivialis - Rough bluegrass is often a contaminant in Kentucky bluegrass seedlots.
  • Fusarium Blight - Some Kentucky bluegrass varieties are extremely susceptible to Fusarium blight, especially if nitrogen availability is high. The disease occurs most frequently during hot weather when the plants are under moisture stress.
  • Stripe Smut - Although it attacks many turfgrasses, stripe smut is most severe on some varieties of Kentucky bluegrass

In your area the University of Massachusetts Amherst Extension may a good resource (here) to help with your lawn diagnosis.



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