First, dry leaves caused by gray mold. In addition to control and drainage in addition to wet down, available 50% speed Keling 1000 to 1500 times liquid, spray once every 20 days; after the leek harvest and seedling height 5 to 8 cm, with 20% Triadimefon 800 to 1000 times solution or 50% Carbendazim 600 times sprayed twice.
Second, the dead leaves caused by the disease. Prevention and treatment should pay attention to drainage and wet down and rotation, in the early stage of the disease can be sprayed 58% metalaxyl Mn-Zn 500 times or 40% E-Ph, 200-300 times, Mu-use liquid 40-50 kg, each time interval 7 to 10 days spray.
Third, the root cause of dead leaves. The prevention and treatment can be used for drying roots, applying grass ash or using 5% phoxim granules per kilogram of 2 kg of finely mixed soil to spread around the leek root and then cover with soil to prevent and control. 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 prevention and control. It can be used 20% quizphos-containing EC 1000 times, breaking the topsoil of the rhizosphere, spraying the roots, and covering the soil at any time, in the morning 9~ 10 spray best. In the emergence period of adult spurts, spray 10% osmium 2000 to 2500 times or 2.5% of deltamethrin vinegar 3000 times, and the spray effect is good from 9 to 10 in the morning.
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