Azaleas are generally healthy plants when their basic cultural requirements are met.
However, they are subject to a number of problems caused by infectious agents, insect pests, weather and nutrition deficiencies. This table, organized by the major part of the plant affected, may help determine the cause of the problem. Leaf spots 2. Browning of leaves at edges and near tips Winter injury 3. Brown areas turning white with small black dots Pestalotia leaf spot B. Leaves off-color 1.