What harm does leek root maggot have? How to prevent?
Planting leek is easier to manage than other vegetables, but leek root maggot is a headache for vegetable farmers. Once it occurs, it is difficult to control, the resistance is not small, and it is not easy to eradicate. If it is not controlled in time, the yield of leek will be reduced. So, what is the harm of leek root maggots? How to prevent and cure?
Harmful symptoms
Leek root maggot referred to as leek maggot, the adult stage is called late-eye mushroom mosquito, damage to the larva, the larva will drill into the leek bulb, the damaged bulb will rot, the aboveground stems and leaves turn yellow and wilt, the plant is short, and the whole plant dies seriously. Leek maggots are also harmful to onions, garlic and other crops.
Hazard characteristics
Generally speaking, in the north, leek maggots pupate and survive the winter; in the warm south, leek maggots are still harmful in winter; in the greenhouse, the damage is the heaviest in winter.
The larvae of leek maggots like to be moist, and the most suitable soil moisture is 20% ℃ 24.7% and the temperature is 20%-25 ℃. Excessive soil moisture or dryness is disadvantageous to the survival and development of each insect state. High temperature, drought or high temperature and heavy rain in summer are the main factors for the decline of leek maggot population.
Prevention and cure method
1. Reasonable rotation. Generally, after planting leek for 3-4 years, crop rotation can be carried out with crops other than onion and garlic. if flood-drought rotation is carried out, it is not only beneficial to the growth of leek, but also reduce the occurrence of leek maggot and other diseases and insect pests.
2. Soaking seeds to promote early germination during insect-free transplanting, and insect-free bed soil was used in seedling bed. Choose maggot-free bulbs when transplanting.
3. Scientific fertilization. Sprinkling plant ash on the border in early spring and after the leek harvest can worsen the oviposition environment of adults and is not conducive to the growth of leek maggots. Adult leek maggots like to eat spoilage, so the application of mature organic fertilizer can reduce the occurrence of leek maggots. Fertilizer should be applied deeply to reduce the spawning of seed flies and effectively reduce the harm of leek maggots.
How to treat leek root maggot? Recommend 4 kinds of green methods for prevention and control, use drugs to grasp the critical period!
4. Chemical control. During the peak period of adult activity and the peak spawning period of adults, abamectin and cyhalothrin can be sprayed to control adults to reduce the number of eggs and larvae; when the field plant damage rate is 10% (when it is diagnosed as root maggot damage), nicotine pesticides such as biphenyl + cypermethrin, cypermethrin or furosemide, thiazide can be used to treat them.
5. Stick to kill adults. In the peak period of adults, sticky insect glue can be used to kill adults, or simple insect sticky boards (yellow boards) can be used directly to kill adults.
6. Trap and kill with sugar and vinegar. The mixture of sugar, vinegar, wine and water was prepared by adding 90% trichlorfon crystal 10 times according to the proportion of 3 / 3 / 3 / 1 / 10.
How to treat leek root maggot? Recommend 4 kinds of green methods for prevention and control, use drugs to grasp the critical period!
7. Light trap. Making use of the phototaxis of adults, several fluorescent lamps were set up in the leek field at night during the peak period of adult Eclosion, and water basins were placed under the lights, which could induce adults to fall into the water and die.
8. Biological control. The use of entomopathogenic nematodes to control insects can effectively reduce the amount of chemical pesticides.
To sum up, in agricultural measures, the application of plant ash is a good way to control the number of leek maggots. In serious cases, chemical control is used, and in lighter cases, the latter four green methods are recommended to produce healthy green agricultural products.
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