Powdery mildew is a fungal disease that affects a wide range of plants, including flowers, vegetables, and trees. It appears as white or grayish powdery spots on leaves, stems, and buds. This fungus thrives in warm, dry conditions and can spread quickly, especially in crowded or poorly ventilated areas. The disease can weaken plants by reducing photosynthesis and overall vigor. While it rarely kills plants outright, it can lead to stunted growth and lower yields. Managing powdery mildew often involves improving air circulation, avoiding overhead watering, and using fungicides when necessary.