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Spotted, dark colors on leaves are an indication of serious problems with your plant. Plant leaves turn black for a number of reasons, including environmental factors and bacterial infections. In some cases the plant is salvageable. However, most of the problems that cause black leaves in plants are irreversible. In every case, prevention is the best way to deal with the disease and dehydration that are common factors in blackened leaves.
Itâs not difficult to recognize blackspot, (Diplocarpon rosae). The fungus initially reveals itself as tiny black spots on foliage. In very short order, the black spots become surrounded by yellow halos. These are not halos of the angelic sort, but the kind that indicate your rose is in trouble. The infected leaves will eventually turn a sickening shade of yellow and then drop to the ground. And, if left untreated, the fungus will continue to attack other leaves on the shrub (young leaves are the most vulnerable).