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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.
Gray Leaf Spot. Gray leaf spot, caused by Pyricularia grisea, causes bleached spots with dark margins on grass blades. St. Augustinegrass, fescues, ryegrasses and kikuyograss are impacted by gray leaf spot, which prefers warm temperatures, high humidity, and over-watered and over-fertilized lawns.