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Zinnias are colorful, low-maintenance annuals that prefer warm weather and bright sunlight. Although zinnias are relatively disease-resistant, they are sometimes plagued by diseases that cause brown spots. The brown spots are usually caused by one of three types of leaf spot -- Alternaria leaf spot, bacterial leaf spot and Cercospora leaf spot.
Brown spots on the leaves of African Violets are caused by a number of factors. Over watering will result in a brown, mushy rot or necrosis of the leaves. Applying cold water directly to the leaves will cause brown spots to form when the plant is exposed to sunlight. Applying warm water directly to the roots of the plant is the best method of watering an African violet.