Potato Late Blight Image. Late blight of potato is caused by a fungus which also causes disease on tomato, eggplant, and other members of the potato family (solanaceae). Potato blight (late blight) is a devastating disease that can destroy an entire potato crop.
Late blight, disease of potato and tomato plants that is caused by the water mold phytophthora infestans. Late blight of potatoes is caused by the pathogen phytophthora infestans.