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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.
Angular Leaf Spot, a bacterial disease caused by Pseudomonas lachrymans, attacks leaves, stems and fruit. The bacterium which causes angular leaf spot overwinters on old plant debris and in seed. Rain splashes it from the soil to the stems, leaves and later to the fruit. Once infection takes place, the organism is spread over the field on the hands of workers or by cucumber beetles.