Mary from Kirkland, Washington writes
Yes, you can use Bayer Advanced Disease Control for Roses, Flowers & Shrubs Concentrate on dahlias, and the product controls powdery mildew. You should use 3/4 fluid ounces per gallon of water at 7-14 day intervals to treat existing disease or for prevention. Please see the product label for complete application instructions.
Answer last updated on: 08/26/2015
