Cercospora leaf spot is a foliar disease most commonly found on watermelons. Characteristic symptoms are small circular spots having dark green to purple margins, becoming white to light tan in the center. The leaf lamina around the spots may become chlorotic and eventually the entire leaf may turn yellow and fall off.
Use good sanitation practices and plow down residues from previous crops promptly. Crop rotations and a fungicide spray program may be required.
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Publication Revised July 2009