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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.
This causes the leaves to initially yellow, dry up and turn brown. Spider mites thrive in hot weather and are worse in dry, hot summers. The phlox bugâs feeding causes white or light green spots on the leaves and buds. The leaves will eventually turn brown, dry out and drop off. The symptoms can be so severe that plant growth may become impeded and die. The phlox bug lives in the egg stage through winter on dead stems.