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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.
Slugs and Snails. Insect pests don't usually cause brown leaf margins, with the exception of snails and slugs. These pests feed on the edges of the foliage, leaving them ragged and brown. They can also cause ragged holes in the center of leaves. Sprinkle slug bait granules on top the soil around the perimeter of the hosta bed. Reapply the granules weekly or after heavy rainfall.