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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.
Rust, a fungal disease, causes red, copper, orange, brown or purplish spots to appear on the leaves. As the disease progresses, infected leaves begin to yellow or brown and can curl, distort and fall from the plant. Controlling rust on plants doesnât require expensive chemical sprays that pollute your home.