The Weather Man says that it is going to be in the 60's Monday and Tuesday of next week so it would be a great time to do that winter spray of Lime-Sulfur or Dormant spray.  Remember that you do not need to put a surfactant (sticker)with it.  Cover the entire bush, canes, leaf tops and bottoms and around the bush on the mulch.  Be sure to spray out past the drip line. The fungus is transferred from the ground/mulch by water splatter. 

When spraying your roses with Dormant oil or Lime Sulfur don't forget to also spray any fruit trees or grapes that you may have in your yard.  They will appreciate it.