Just read the links Toni posted. An entomologist who is researching RRd came to talk to our Master Gardener group and to the rose society. There are no chemicals out there yet that you can use that will be effective against the mite or the plasma. i can't believe that MOBOT actually mentioned using Sevin! yikes! There's no worse chemical out there for the bees! Sevin will not prevent, or help any rose fight off, RRD.
