In addition to drainage and dehumidification, gray mold can be used 1000-1500 times 50% speed Ke Ling, spray once every 20 days; after Leek harvest and seedling height 5-8 cm, with 20% Triadimefon 800-1000 times liquid Or 50% carbendazim spray 600 times twice. The disease pays attention to drainage, dehumidification and rotation. In the initial stage of disease, 58% metalaxyl Mn-Zn 500 times solution or 40% EB 200-300 times solution is sprayed twice. Each time interval is 7-10 days. 40-50 kg. You can increase the use of plant ash, or per acre with 5% phoxim granules 2 kg mixed with fine soil in the rhizosphere, then cover the soil. During the period of larvae damage, it was found that when the tips of the larvae began to yellow and become soft and fell to the ground, they could break open the topsoil of the rhizosphere and irrigate the roots with 25% quizphos-peroxidase 1000 times, and then cover the soil. The best results were obtained at 9-10 am. The adult emergence period can be sprayed with 10% osmium 2000-2500 times fluid or 2.5% deltamethrin 3000 times solution, and the effect is better at 9-10 am. Guangzhou Zhongzhinan Supply Chain Co.,Ltd. , https://www.gzzhongzhinan.com