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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.
Fungal Infection. Brown patch is a fungal infection of zoysia grass responsible for the presence of brown spots. Caused by the fungus Rhizoctonia solani, brown patch also occurs on other grasses like perennial rye and bluegrass, according to the University of Nebraska-Lincoln Extension.atural Control. Remove and destroy affected grass after mowing to prevent disease spread. When mowing grass, use a sharp mower blade instead of a dull one; dull blades don't make a clean cut and create wounds that fungi can easily invade.