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Cercospora leaf spot disease is caused by a fungus similar to the type that produces edible mushrooms. Unlike mushrooms, however, leaf spot disease fungi take up residence on leaves and invade their tissues by way of sunken depressions. At high magnification, tiny spore producing plants can be seen developing inside these recesses, and the spores can be spread when the plants are watered or during a rain shower. The disease thrives in a damp, warm environment that fosters the growth of the fungus, and it can live in the soil or in dead vegetation that hasn't been properly disposed of or composted.
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