Knockout Roses & Fungi

I have knockout roses & they seem to have a fungi. can anyone tell me if I can can treat them & save them or will need to distroy them?:

  • Douglas Hunt
    Douglas Hunt New Smyrna Beach, FL
    Mary, you'll need to check the label on the Bayer. There should be an indication about how long to wait before applying anything else.
  • The Blooming Gardener
    Bayer 2 in 1 works systemically, through the roots, and is a fertilizer with an insecticide. Bayer 3 in 1 has the fungicide too. I think you have to keep using it for it to work correctly and eradicate the fungus. To help keep new fungus from spreading
  • Mary Braid
    Mary Braid Hagerstown, MD
    Have a ??? on the amount of vinegar to use for black spot. Is the 1/4 teaspoon in a quart of water the correct measurements? It seems like so little vinegar for the amount of water?
  • Lawn Pro
    Lawn Pro Virginia Beach, VA
    make shure that when you dead head or prune knockout roses that you remove these clippings or you will re-introduce the infection back in the area again
  • Douglas Hunt
    Douglas Hunt New Smyrna Beach, FL
    I do not know what formula you're referring to Mary, but there are some here:
Mary Braid