The root of leeks is referred to as quail, and the adult is called larvae. The larvae gather on the non-vegetated underground stalks and tender stems, causing damage and rot. The shoots and leaves on the ground turn yellow and die. Generally, there are three major damage periods each year, from early April to late May, early June to mid-July, early July to late October, of which the third is the most hazardous. In the greenhouse, the climate is more suitable for breeding, the occurrence period is greatly advanced and elongated, and the hazard is more serious. The damage to the re-emergence field is more than 50%. Now its prevention and control technology is introduced as follows: First, rational fertilization and chemical treatment Organic fertilizer less nitrogen fertilizer, increase phosphate fertilizer. Because adult worms prefer to eat raw materials, the organic fertilizer is applied to the field every time after the decomposed organic fertilizer is applied. Each cubage of organic fertilizer uses 20-30 ml of dimethoate, 10-15 kg of water, and is mixed for 24 hours. II. Irrigation of insects Winter or spring irrigation can eliminate some of the larvae and reduce the damage. Third, spraying pesticides to control adult eclosion during the peak period, with 2.5% green kaffold pyrethroid or 2.5% enemies or 20% cypermethrin 3000 times solution, sprayed at 9 to 10 in the morning, once in 10 days, Even spray 3 to 4 times. Kill adults and reduce spawning numbers. Fourth, pesticide spraying pesticide found leek leaves tip yellow, plant sporadic when every 667 square meters with 48% of the Bass 200 ~ 250 ml water 1000 kg sprayer sprayed with turbidity sprayed chives root, It will take 3 to 5 days and the effective period is 25 to 30 days. 2, with the irrigation water application of 667 square meters with 48% of Bass 300 ~ 500 ml right amount of water made of mother liquor, and then slowly into the water inlet in the water stream, so that it is poured into the water with the root of chives. This method is simple and labor-saving, but it is necessary to increase the dose. The music period is a pollution-free pesticide and it is safe to eat. You can market it by cutting it 14 days after filling.