Allium oreophilum · Bulb
Allium leaf miner: Cover plants with fine insect-proof mesh during peak fly activity in spring and autumn.
Onion downy mildew: Ensure good air circulation and avoid overhead watering to keep foliage dry.
Onion white rot: Remove infected plants immediately and do not replant alliums in that soil for at least 10 years.
Onion fly: Use insect-proof netting from early spring to prevent adult flies from laying eggs.
Slugs and snails: Apply iron phosphate pellets or use beer traps around the base of the plants.