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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.
They are hardy in U.S. Department of Agriculture plant hardiness zones 4 through 9, depending on the species. When azalea leaves turn pale and have brown spots on their undersides, only one cause is likely: lace bugs. Fortunately, the problem is fairly simple to remedy.