Diagnosis and Control of Garlic Leaf Blight
1. Field diagnosis: Garlic leaf blight mainly harms garlic leaves and garlic sprouts. The leaf sensation mostly develops from the tip of the leaf to the leaf base and spreads from the lower leaf to the upper leaf. At the beginning, it was a pale dot or a slightly hollow white dot, and it was grayish-white, gray-brown or light purple. When wet, a dark brown moldy layer grows. As soon as you take it out, you become infected and you can easily break it from the disease department. At the end of the disease, many granular black spots were scattered. When the damage is severe, the diseased leaves will die and the garlic sprouts will not come out. The disease is affected by rainy and humid conditions, and on low-lying, infertile plots, it is often afflicted with garlic fields, garlic fields, or long-leaning nitrogen fertilizers.
2. The key to prevention and control:
1 round of change, generally 2 to 3 years.
2 Use formula fertilization to cultivate strong seedlings.
3 appropriate sowing, reasonable close planting.
4 scientific management of water, water system, stop the rain stop, reduce humidity and drop.
5 chemical control. In the early stage of disease, 50% thiophanate-methyl wettable powder 500 times, or 25% mancozeb wettable powder 500 times, or 75% chlorothalonil wettable powder 500 times, or 50% Hydration WP 1000 times and other spray, spray 7 days, depending on the condition, even spray 2 or 3 times.
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