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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.
If the brown or black spots are on the underside with a corresponding yellow splotch on the top of the leaves, suspect rust, a fungal infection. Caused by Puccinia menthae, mint rust mainly infects peppermint and spearmint. Destroy infected mint plants.