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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.
Insects like aphids, mealy bugs or scale feeding on the plant can also cause brown leaves and flowers. Examine the plant carefully, turning over the leaves. Insects may show up as clusters of white under leaves, on stems or around flowers.