What are some common diseases that affect allium plants?

Allium plants can be susceptible to certain diseases that can impact their growth and overall health. Some common diseases that affect alliums include onion downy mildew, white rot, and bulb rot. Onion downy mildew is a fungal disease that causes yellowing, wilting, and eventual death of the foliage. White rot is a soil-borne fungal disease that affects the bulbs, causing decay and a white fungal growth. Bulb rot can be caused by various fungi and bacteria, resulting in softening and rotting of the bulbs. To prevent diseases, it's important to practice good garden hygiene, including crop rotation, proper watering, and providing adequate air circulation. Removing and disposing of any infected plant material can help prevent the spread of diseases. In some cases, fungicides or other disease management strategies may be necessary.