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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.
Alternaria symptoms once infection begins include small, dark, circular spots that regularly reach Â½ inch in diameter. As they spread, alternaria leaf spots may change in color from black to tan or gray, with a yellow halo around the outside.Because spot development is heavily influenced by the environment, there are frequently noticeable concentric rings that spread from the initial point of infection.he fungal pathogens in the genus Alternaria can be devastating to plants year after year. The spores overwinter on old plant debris and attach themselves to seeds, making alternaria leaf spot especially tricky to completely eliminate if you save your own seeds.