Caused by a type of soil-borne fungus, Sclerotinia prefers moist, humid conditions. The disease mainly affects mature lettuces, as well as other leafy greens, beans, cucumbers, citrus, melons, potatoes, and tomatoes. Symptoms include water-soaked spots on leaves that can become slimy or dry lesions on the stalk, stems, and branches that turn yellow, then brown.
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