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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.
Here's the list to run through: 1) Plants are too dry. 2) Plants are too wet. 3) Foliar leaf damage from a bacteria or virus, especially if the yellowing of the leaves is accompanied by small dark spots (probably bacterial speck) or larger brown spots with concentric circles (probably early blight). 4) A more serious disease like verticillium wilt or fusarium wilt.