Fungus problems with roses

Black spot has been around forever. Makes roses look really bad and really does quite a bit of damage. Fungicide  applied every 10 days for a month usually does the trick.

A kind of new fatal disease is Rose Rosetta. It is spread by a tiny mite.I treat them to with a fungicide and an insecticide labeled for mites with some success. If they are near other roses or too far gone it is best to remove them.

Knockout roses after treatment. Not cured but looking much better.
The photo above or to the right is the same bushes with the Rosetta disease about two months earlier.