- The document describes early blight, a fungal disease of potato caused by Alternaria solani. It was first described in 1882 and causes dark lesions on potato leaves and tubers. - The disease cycle involves primary infection from inoculum on infected plant debris or other hosts, followed by secondary spread between leaves by conidia dispersed by wind during periods of wet and dry weather. - Management strategies include using resistant varieties, removing crop debris, adjusting irrigation and fertilizer, rotating crops, and applying fungicide sprays.