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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.
A fungal or bacterial disease affecting flowers, leaves, and shoots causing young growth to turn black or brown and curl up. avoid overfeeding and severe pruning. in summer, remove limbs, cutting well outside infected area (6-12) and dispose. for severly infected trees, contact a certified arborist. fungal disease of oaks that appears as yellow-white blisters up to 1/2 in diameter on upper leaf surface, with corresponding yellowish brown depression on leaf undersides. Numerous spots will cause leaf to fall prematurely, but does not seriously affect tree health.