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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.
Septoria Leaf Spot. This fungal disease announces itself with small black spots on the leaves that develop light-colored centers. Eventually the spots turn white or gray with a dark-colored margin and a black dot in the middle. You'll see them first on the bottom leaves before they progress up the plant. A mild case may turn severe in wet weather. To control septoria leaf spot, ensure good air circulation between plants by spacing them well.