First, the dry leaves caused by the disease. The occurrence of the disease is related to drainage. During the prevention and treatment, attention should be paid to drainage, dehumidification, and rotation. In the early stage of disease, 25% of thioredox may be used 600 times, or 58% of metalaxyl MnZn may be 500 times or 40% of BHP 200~300. Double liquid, 40-50 kg per mu, 7-10 days.
Second, dry leaves caused by gray mold. In addition to drainage and dehumidification, 50% quick-closure can be used for 1000 to 1500 times, once in 20 days, 20% in triadimefon 800 to 1000 times, or 50% in carbendazim to 600 times. After harvesting, the seedling height Spray 2 times when 5~8cm.
Third, the root cause dry leaves. Control can be used on the sun root, apply grass ash, sprinkled near the root of leeks and then covered with soil. During the period of larvae damage, it was found that the tip of the leaf began to yellow and become soft and lodging on the ground. It can be used for drug prevention and treatment. It can be used 20% quizphos-containing EC 1000 times, breaking the rhizosphere topsoil, sprinkling the roots, filling the soil at any time, to 9~10 am Spraying works best. In the emergence period of adult (mid-late and late April, mid-June, late July and mid-October), spray 10% osmium 2000~2500 times, or 2.5% deltamethrin 3000 times, 9~10 am Good spray effect. Late-infested adult mosquitoes live in multiple shades, damp, and humus habitats. During the summer and autumn, the ventilation of the leaves can be reduced. The light tends to be polarized and can also be trapped and killed by frequency-vibration insecticidal lamps.
Fourth, physiological diseases caused by dry leaves. The phenomenon of dry tip, leaf blight and dead plant occurs in leek, and sometimes it is related to soil acidification, ammonia poisoning, high temperature (above 35°C) and low temperature causing white tip and rotten leaves, and calcium deficiency.
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