Rose bush disease

Asked September 13, 2017, 10:13 AM EDT

Hello,

Can you please advise me as to what this mold-like infection is, and how best to treat? Worried about my beautiful rose bush.

Thank you!

Holly S.

Douglas County Colorado

1 Response

Looks like powdery mildew, link below describes it, with solutions. CSU fact sheet, 2.902 Powdery Mildew. Also additional info .
Primary info:decrease watering (especialy overhead ) increase air circulation .
https://www.google.com/url?q=http://extension.colostate.edu/topic-areas/yard-garden/powdery-mildews-...
extension.colostate.edu/.../native-herbaceous-perennials-for-colorado- landscapes-7-242 and Horticultural oils
https://extension.colostate.edu/docs/pubs/insect/05569.pdf