Nikki
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on January 12, 2012
It's caused by a fungus, which can be brought about by overly wet conditions. This article should be of some help to you: https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-powdery-mildew.htm
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ralphclog
Answered on January 13, 2012
thank you!
Angie
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