Stella from Vancouver Bc writes
What if some black more spots appear after the 3 spray already done ?
There are restrictions as to how much active ingredient can be applied per year depending on the product and application method. The product label for Bayer Advanced Disease Control for Roses, Flowers & Shrubs Concentrate advises to apply every 7-14 days for a total of 3 applications beginning at the first sign of disease. If you are still seeing signs of the disease after the 3 applications, you can rotate to a different class fungicide labeled for black spot on ornamentals, flowers, roses etc such as Liquid Copper Fungicide. **NOTE: The Bayer Advanced Disease Control for Roses, Flowers, & Shrubs has been discontinued. Bio Advanced 3-in-1 Insect Disease & Mite Control Concentrate is an alternative for black spot. Please view the product label for more information.
Answer last updated on: 06/18/2022
