my roses have a gray powdery substance.

Asked May 28, 2018, 12:50 PM EDT

why do my roses have a grey powdery mildew? Some of the leaves are curling a bit. What can I do ?

Multnomah County Oregon roses powdery mildew

1 Response

Powdery mildew is common on roses in our pacific northwest climate, though without a photo I'm not certain that is your problem.
OSU Extension has publications and articles about how to deal with this problem on roses. Note that choosing resistant roses is a repeated theme, and some homeowners choose to replace those that have repeated problems.
"Controlling Diseases and Aphids on Your Roses", EC1520, https://catalog.extension.oregonstate.edu/ec1520