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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.
Annual Vinca foliage with Phytopthera wilts as if the plant needs. watering. Answer: As can be seen from these images, the stem turns black and the plant above the lesion will gradually die. When you see this symptom on a plant you should remove it from the bed and discard it in the garbage.