When it comes to leeks, I believe that everyone will not feel strange, it is almost a common dish in people's daily lives. However, consumers generally worry about whether pesticide residues exceed the standard when purchasing, and there is a pest called leek maggots in the cultivation of leeks, which is the nemesis of leeks, which will lead to a significant reduction in leek production, which is also the main reason for leek pesticide residues exceeding the standard. The harm of leek maggots is extremely great and difficult to prevent, which also makes the majority of farmers feel headaches, so how can we effectively prevent and control leek maggots?
In fact, the scientific name of leek maggots is called Leek Late-Eyed Mushroom Mosquito, and it has four morphological characteristics, namely adult eggs and larval pupae, and usually the larval insect state is called leek maggots. Generally speaking, leek maggots can occur for 5 to 6 generations a year, and not only can harm leeks but also endanger vegetables such as green onions and garlic, which will lead to a significant reduction in vegetable production.
chemical control
Want to prevent and control leek maggots are the most commonly used pesticides octyl thion, chlorpyrifosin matrine, etc., and because in recent years the state has banned some highly toxic pesticides on vegetables, it is necessary to choose a more environmentally friendly low concentration of drugs for prevention and control, which also leads to chemical control is slightly weak, especially for leek maggots occur more seriously in the area. Therefore, in addition to chemical control, it is also necessary to understand other control methods.
Physical control
In the greenhouse, you can use the high temperature shed method; in the open field, you can use the mulch cover method, both of which use the principle of high temperature to eliminate leeks. Most of the leeks will be present in the topsoil of 3 to 10 cm, so it will be very effective to treat the soil at high temperatures.
Biocontrol
The use of leek maggots of the natural enemy pathogen nematodes to treat insects, can also play a very good effect, with the cost of biological control gradually reduced and the majority of consumers for green and healthy agricultural products demand is getting higher and higher, biological control gradually becomes no longer out of reach. Therefore, biological control is also an option for farmers. In addition to these methods, it can also be effectively controlled by reasonable dense planting, reasonable crop rotation, soil sprinkling of quicklime or grass and wood ash.