simply prune the affected areas and throw out the clippings. Do not water the head to prevent this from happening again.
Canker
A canker is another fungal disease that causes the canes to turn black or brown. All you have to do is prune the canes just below the canker in the early spring.
Midge
A midge is a tiny maggot that causes the rose’s buds to blacken from the damage. If you want to fix this problem, prune the affected area and then destroy it.
Rust
Rust is a disease that creates an orange powder in the center of the rose. It is caused by wet and calm winter weather. Putting in some spider mites can help with this because they hate the water. You should consult your local garden center about the best insecticide to use in order to get rid of the spider mites. Once you have chosen the insecticide, spray every 7-10 days until it is under control.
Powder Mildew
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