Leek planting: why leek is easy to residual pesticides?

Why is leek easy to remain pesticide? Please introduce the reason, now many people are saying, "leek is very easy to residual pesticides", but exactly why, but few people say clearly. To find out why leeks have pesticide residues, we should also start from the diseases and insect pests that leeks want to prevent. The reporter learned yesterday that generally speaking, in the case of prescribed medication, there is no problem with leek. Once illegal use of medicine, all kinds of pesticide residues will accompany leek through various channels and enter our table. "there are two main pests that leeks are most afraid of. One is called the heart-drilling worm, and the other is called the leek maggot." Yesterday, at the "Luxiang" leek base in Chaijia Village, Zhangqiu Diao Town, vegetable farmers introduced to reporters, "the heart-drilling worm hides in the base of the bifurcated leaves of the leek, nibbling leaves from the inside, and the leek maggot is at the root of the leek. Leek maggots don't like the heat, so they are mainly active in autumn and spring, when the heart worms begin to come out until September or October. " The drillworm, which vegetable farmers say, is a kind of diamondback moth with silking habit, which mainly eats the white part of leek, which is small but highly resistant to pesticides. The adults of leek maggots are called leek toadstool, which is the main pest in the production of leek. The adults lay eggs in the soil crevices or clods around the leek plant. After the larvae hatch, the bulbs and tender stems gathered in the underground part of the leek are damaged, causing the young stem to rot, so that the leek leaves wither and die, and in serious cases, the whole leek dies. "No leek is grown without medicine, as long as it is in accordance with the standard, it will be all right." Vegetable farmers generally spray prescribed pesticides, or use biogas slurry and other methods to prevent them, and these regular prevention methods are all right. "there are also some retail investors who use drugs that do not conform to the regulations." the prevention of heart worms is mainly to spray pesticides on the leaves, while the prevention of leek maggots is to apply medicine directly to the roots of the ground, so there are medicines on the leaves, and pesticides are absorbed directly from the roots. " "because leek maggots are hidden in the soil, a large number of highly toxic pesticides must be sprayed, and it is more common to irrigate with toxic organophosphorus pesticides, such as parathion and methyl parathion." Qiao Chuanling, head of the resistance molecular genetics research group of the Institute of Zoology of the Chinese Academy of Sciences, said that through this operation, a large amount of organophosphorus pesticides will be absorbed by the roots of leeks, "and the organophosphorus pesticides that enter the inside of leeks through the roots are not easy to wash off." To prevent heart worms is mainly to spray pesticides on the leaves, while to prevent leek maggots is to apply medicine directly to the roots of the ground, so there are drugs on the leaves, and pesticides are absorbed directly from the roots. Click to get more leek planting techniques click to get more vegetable planting techniques