Garlic leaf blight. Use 800 times 80% diclofenac manganese zinc or 600 times 70% propoxur zinc or 1000 times 30% tebuconazole. Dodemorph or 800 times 77% dornin or 600 times 66% tungia or 1:2:200 times Bordeaux solution for control, every 7~10 days foliar spraying, spraying 2~3 times in a row, you can control the disease and make the diseased plant to return to normal growth.