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Late Blight
Late blight is a devastating disease for tomatoes and potatoes. It was responsible for the Irish potato famine of the 1840s. It first appears as pale water-soaked spots on the leaf edges, often surrounded by a yellow border. Lesions will enlarge rapidly and turn dark brown or purple. Late blight is caused by a fungus, so avoid getting leaves wet when watering. Fungicides should be effective at preventing the disease.