Onions - Stemphyllium Blight

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Stemphyllium Blight
(fungus - Stemphyllium vesicarium): Lesions are initially light yellow to brown and water-soaked. They elongate, often reaching the leaf tips, and become dark brown to black. The disease can become serious following periods of more than 24 hours of rainy weather. Fungicides used to control purple blotch will also control this disease.