My Knockout Roses have developed powdery mildew, how do I treat this?
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Thank you! I will see the local nursery for guidance.
I have used Sevin powder with success. A very light dusting on the leaves, Just be very careful when using the powder. I suggest that you wear a mask when applying it to your roses. A little powder will go a long way.
Use a systemic treatment for roses. Bayer is a recommended product for insect,fungus and a fertilizer.
I've used Bayer with success