If you remove the plant from the pot and note a large amount of roots circling the potting soil, or if a solid mass of roots is present with little or no soil showing, repotting is necessary. Fungal leaf spots can vary in size, shape, and color. Often the spots will have a distinctive margin and be sprinkled with minute black dots. If spots are numerous, or if they enlarge, diseased areas may come together to form irregular blotches. Infected leaves may wither and die.
Most fungi require moisture on the leaf surface before infection can occur.
Never mist plants if a fungus leaf spot is suspected. If infection is light, pick off and destroy infected leaves. Increase air circulation by spacing plants so that they are not crowded. Most fungal leaf spots will clear up after a few months of such attention. Pesticides are generally not required nor recommended for such problems.