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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 leaf spot in potatoes: Plan for this early blight look-alike in 2013. Brown leaf spot of potatoes can be misidentified as early blight, potentially compromising disease control. Early blight, caused by Alternaria solani, is a very common fungal disease present in most regions that produce potatoes.