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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 leaves or flowers with white or dark spots can result from a fungal infection in the plant. Fungal infections are often a result of soil that is too moist, or of leaves and flowers that are damp from watering or humidity.