Potato blight is a plant disease caused by the fungus-like organism Phytophthora infestans. It primarily affects potato and tomato plants, leading to dark, water-soaked lesions on leaves and stems. If not controlled, it can cause the entire plant to wilt and die, significantly reducing crop yields. The disease thrives in cool, moist conditions, making it a common problem in many regions. Farmers often use fungicides and resistant plant varieties to manage potato blight. Early detection and proper management are crucial to prevent the spread of this destructive disease and protect food supplies.