Q.Powdery mildew on base of double knockout rose bushes
Powdery mildew on base of double knockout rose bushes
GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 9, 2020
Here is information on powdery mildew from our resident rosarian that should help.
https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-powdery-mildew.htm
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