Provided that the roses have been well watered and fed, it sounds like you may have a mix of insect and fungus problems. I would recommend buying some Bayer Tree and Shrub granules. Give all of the rosebushes a treatment of this product per the label instructions. Work into the soils a bit and water in well. Prune out all dead canes prior to doing the treatment.
Answered on May 24, 2016
Was this answer useful?00
Looking for more?
here are more questions about...Hyacinth Plant