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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 spots on the leaves of hydrangea shrubs are mainly caused by leaf spot diseases, which can either be fungal or bacterial in nature. Cercospora leaf spot and anthracnose are common fungal infections that affect hydrangeas, while bacterial leaf spot is commonly caused by the pathogen Xanthomonas campestris.