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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.
This causes the leaves to initially yellow, dry up and turn brown. Spider mites thrive in hot weather and are worse in dry, hot summers. The phlox bugâs feeding causes white or light green spots on the leaves and buds. The leaves will eventually turn brown, dry out and drop off. The symptoms can be so severe that plant growth may become impeded and die. The phlox bug lives in the egg stage through winter on dead stems.