Does being near or under a tree make blackspot worse? My Kentucky Derby is
always COVERED with blackspot, and no amount of anything will keep it from
looking pitiful. The tree is a crabapple, I think. I have 3 other roses
under the same tree (it doesn't block their sun) and they all have minor
blackspot too, though not as much. I wonder if the tree makes it worse? Or
weeds? Does anyone else have a blackspot problem with Kentucky Derby?

JimS.
Seattle