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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.
A cucumber plant with dry, brown leaves may be suffering from a cultural problem or a disease. If the condition does not go away with improved cultural care, try again the following season with a disease-resistant variety. Angular leaf spot is a bacterial disease that causes angular brown spots on leaves.