Allium jesdianum · Bulb
Allium leaf miner: Remove and burn affected foliage immediately after flowering to break the life cycle.
Onion white rot: Avoid planting alliums in infected soil for at least 10 years and ensure good drainage.
Onion downy mildew: Improve air circulation, avoid overhead watering, and remove severely infected plants.
Onion fly: Use insect-proof netting from early spring to mid-summer to exclude adult flies.
Bulb rot: Plant in well-drained soil or containers with grit to prevent saturation over winter.