First, disease resistant varieties such as Zhongkai No.2, Kemu No.1, and 791 Xueluo were selected for gray mold. More organic fertilizer, timely fertilizer, watering, weeding, timely ventilation and humidity, is the key to the prevention and treatment of the disease. The amount of ventilation should be determined according to the growth of the leek. If the freshly cut leeks or the outside temperature is low, the ventilation should be small or delayed, and the wind should be prevented from sweeping. After the leek is harvested, the diseased body is promptly removed to prevent the spread of germs. The use of different types of bactericides must be applied alternately to ensure the best control efficiency. At the beginning of the disease, 50% of the procymidone WP can be sprayed with 40 to 60 grams per mu, and the number of application can be determined according to the condition of the disease. Per acre can also be used 45% of carbendazim and sclerotin net mixture 50 to 60 grams for prevention and treatment.
Second, earthworms can be trapped and killed according to adult phototaxis and chemotaxis. Place an ordinary fluorescent lamp in the leeks and put a pot of water under the lamp to trap and kill adult worms. You can also use sweet and sour liquid to trap adult insects. The method is to prepare sugar, vinegar and water in a ratio of 1:2:15, and put a small amount of crystal trichlorfon, and put it in the field for culling and killing at the peak of adult emergence. Winter water irrigation is required before land closure. After irrigation, the soil on both sides of the ridge can be sprinkled into the leek field. The thickness of the cover soil is 3 to 4 cm. The number of spring pupae can be effectively controlled, and basically no harm is caused. In the larval damage period, topdressing 15 kg of ammonium bicarbonate during watering can control larval damage. In order to prevent adults from spawning during the harvest of leeks, plant ash can be applied at the same time. If fertiliser is applied without composting, maggots are very serious, so it is necessary to apply sufficiently decomposed organic fertilizers. It is also possible to use wolfberry for crop selectivity and to select crops that are not harmful to crop rotation. The rotation period is 3 years, which will play a good preventive role. At the peak of the larval stage, 48% of chlorpyrifos EC may be used for root filling. The method is to dilute 400-500 ml of liquid per acre, and then water with the watering. Can also be used 48% of chlorpyrifos EC 1000 times spraying. The method is to turn off the sprayer nozzle and shoot the root of the leek when harvesting the leek. In order to ensure that the liquid can penetrate to the root, it is better to spray a certain amount of water after spraying, and then cover the soil.
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