At the time of onset, the tip of the blade first developed downwards, and white or light brown spots appeared on the front and back of the blade at the onset of the disease. As the disease progresses, the lesion expands into a fusiform or elliptical shape, and finally the lesion becomes a patch and the diseased leaf is dry. When wet, the diseased leaves produce a layer of gray to gray-green and dense mold. To prevent and treat the disease, we must first drain and dampen, and then use 50% fast keratin 1000 to 1500 times, spray once every 20 days, 20% triadimefon 800 to 1000 times or 50% carbendazim 600 times, after harvesting leek When the shoot height is 5-8 cm, it is sprayed twice.
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