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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.
Brown Patch. Brown patch can be a problem in zoysia grass. Rhizoctonia fungus is often the culprit, caused by overfertilization. Fortunately, it does not kill the grass and zoysia is able to recover as it fills in during the warmer weather. Proper fertilization and watering helps to control this disease.oysia grass tends to produce thatch from dried cuttings and dead material that can cause brown patches on the lawn. This material can get quite thick and tangled and prevent fertilizer and moisture from reaching the soil and roots.