What happens to the appearance of headless seedlings in Chinese cabbage?

Most of the reasons for the appearance of headless seedlings in cabbage seedlings are caused by the larvae of cabbage borer, which generally occurs in autumn. <>

Farmers generally call the vegetable borer larvae as cabbage worms and heartworms according to their characteristics. Due to the different weather, the dryness and wetness of the land, etc., there are differences in the occurrence of insect pests, but the overall insect pests are concentrated in July and October, so if you want to prevent cabbage seedlings from appearing headless, vegetable farmers must pay more attention during this critical period. About how to protect:

First of all, it is necessary to remove the dead branches and leaves in the field frequently, reduce the density of insect eggs, and regularly turn the soil deep to ensure that the roots of cabbage seedlings have sufficient oxygen, which can ensure that the roots of cabbage seedlings will not rot, and can also reduce the accumulation of insect eggs in the roots of cabbage seedlings. If the pest damage is serious, you can also manually remove the pests, and manually kill the pests in the heart of cabbage seedlings and leaves in time, which can save a lot of time, and the effect is also very significant. <>

In addition, when sowing, it is also necessary to pay attention to the cabbage seedlings not to be too dense, too dense planting will also lead to the growth of insect eggs. And vegetable borer likes to be a group pest, and dense cabbage seedlings are tantamount to providing a lot of living space for insect eggs, which is not conducive to eliminating insect pests. Finally, to eliminate insect pests, you can also spray a certain pest eliminator, such as cucumber vine, etc., according to the instructions, the pesticide stock solution and water are configured in an appropriate proportion, according to the growth of cabbage seedlings and local real-time weather conditions, spray once in a while, the effect will be obvious.

And when spraying pesticides, pay attention to the period when cabbage seedlings are prone to insect infestation. For example, the true leaf stage. <>

Because most of the pests gather in the center of cabbage seedlings, pesticides should be applied to the center of cabbage seedlings as much as possible to reduce the waste of pesticides, and at the same time avoid pesticides from damaging other healthy parts of cabbage seedlings, resulting in cabbage seedlings wilting or other adverse symptoms. And the pesticide components are not easy to decompose, if the pesticide is applied excessively, too many pesticides will remain in the land, causing pollution of the land, which is not only not conducive to eliminating the pest pest of cabbage seedlings, but also has a great impact on the subsequent planting.

Because of the low seed development rate. This situation is normal, if there is a large area of this situation, it means that it is a seed quality problem, and the seeds must be replaced in time to ensure the yield.

The phenomenon of headless seedlings in Chinese cabbage is generally caused by cabbage worms, which will eat the cabbage of Chinese cabbage and spin silk leaves on it, resulting in lack of seedlings and seed destruction.

The appearance of headless seedlings of Chinese cabbage is caused by the larvae of vegetable borer, which generally appears in autumn, so vegetable farmers must pay more attention and take more precautions during this critical period.

The main thing is "vegetable borer", so if you open the leaves of this cabbage seedling, there are almost several larvae of this cabbage borer bent there, and some are even very arrogant eating the leaves of the Chinese cabbage seedling.

The first is to cover the mulch film with mulch, so that it can have the effect of heat preservation, and of course, it can also be planted by ditching to keep it from being exposed on the ground. However, it is necessary to pay attention not to press the seedlings, otherwise it is easy to have frost damage on the top. Before and after winter, Chinese cabbage is the critical period of growth, and the temperature difference between morning and evening in the north is relatively large at this time.

Watering is generally carried out between early to mid-November, and in mid-to-late October in the northeast and northwest regions, the situation is different in each region, so it is necessary to make Chinese cabbage is the main winter vegetable according to the local area, but it is stored and eaten after harvest, rather than produced in winter.

<>Therefore, there is no such thing as Chinese cabbage freezing damage in the ground, unless it is not harvested when the cabbage is harvested, and let it stand in the ground, it is believed that the cabbage is native to the north of our country and is a cruciferous vegetable, usually referring to Chinese cabbage. It is introduced to the south and cultivated in all parts of the north and south. There are many types of Chinese cabbage, and the frost resistance is also different, so the frost resistance of Chinese cabbage can be solved from the above.

Just when the cold air comes, our cabbage has grown and has been harvested, and at the time of the 11th National Day, all the Chinese cabbage has been pulled to the city's autumn storage point one by one, ** for urban residents to reserve the open-air planting of Chinese cabbage, which can be covered with a small arch shed, covered at night with straw or straw curtain, which can also play a role in freezing and cold protection.

Generally, before the arrival of frost and ice and snow, the northern Chinese cabbage has been harvested, and the harvested Chinese cabbage can be stored in the cellar or generally before and after the frost, when the temperature drops, the vegetable farmer will tie up the cabbage in the vegetable garden, in order to promote the cabbage to wrap the heart, keep warm and moisturize, and be conducive to the growth of the cabbage. Fast, so sudden, people were caught off guard. Chinese cabbage is easy to freeze in a low temperature environment.

If you don't rush to harvest or keep warm, you will cause losses. Before the cold air comes, the Chinese cabbage that is too late to be harvested can be protected from cold and frost in two steps.

Cabbage headless seedlings are harmed by vegetable borer. Such cabbage seedlings grow very slowly, and in severe cases, they will all wilt, resulting in reduced yields.

Lack of nutrients, drought and lack of water, insects, etc. will all cause kohlrabi to have no head seedlings. When the land is dry and lacks nutrients, kohlrabi cannot grow, and it is easy to eat the young seedlings when there are insects.

Cabbage headless seedlings are generally caused by the damage of cabbage borer, and the larvae of cabbage borer are usually called drill heartworms, heartworms, cabbage borers, cabbage borers, radish borers, etc., mainly in autumn cabbage is the most seriously damaged. The formation of centerless seedlings will lead to the stagnation of plant growth, or the roots can not be thickened, and finally the whole plant withers, the whole vegetable loses its utilization value, and the yield is seriously reduced.

1. Cabbage headless seedlings are generally harmed by vegetable borer. Moreover, the cabbage seedlings after being damaged by vegetable borer grow slowly, and in severe cases, the whole plant will wilt, resulting in reduced yield. Many farmers think that they are infected with soft rot, which leads to poor control results.

However, hairy wounds after being bitten by larvae are susceptible to soft rot, which needs to be noted.

Infectious diseases: Dead cabbage seedlings, mainly due to black rot, will cause the plant to collapse and the stem base to rot. Soil is too wet:

Cabbage grows in soil with excessive humidity for a long time, which is easy to waterlogging, and the roots are soft and wilted. Continuous cropping: If you plant in conjunction with a cruciferous crop in the past, the seedlings will also die.

1. Infection with diseases

The death of cabbage seedlings is generally due to the infection of black rot, which sometimes expands along the leaf veins, forming large yellow-brown spots or reticular black veins, resulting in the drying up and falling off of some outer leaves, and in severe cases, the plant is paralyzed, and the stem base is rotten, which is more harmful.

2. The soil is too wet

Due to the weak resistance of cabbage seedlings, if the rhizome grows in the soil with too much humidity for a long time, it will lead to wilting and rotting, especially in the rainy season, when the seedlings are exposed to rain for a long time, and there is too much water in the plot, so that the seedlings die.

3. Implement continuous cropping

Cabbage has very high requirements for the soil environment, suitable for growing in loose, less pests and diseases, fertile plots, avoid continuous cropping, especially the plots with cruciferous crops in the front, if it is planted continuously, it will lead to the death of seedlings.

4. Prevention and control methods

In order to prevent the death of cabbage seedlings, during the breeding period, fungicides should be sprayed regularly to maintain a healthy growth environment, kill the germs and insect eggs in the soil, and after the rain, the stagnant water in the field should be discharged to avoid waterlogging of the cabbage.

The reasons for the death of cabbage seedlings include pests and diseases, dry weather, too much sunlight, and high ground temperature. Before planting cabbage, it is necessary to choose varieties with good resistance and heat resistance, and it is also necessary to disinfect the seeds and soil. In summer, the temperature is high and the sunlight is strong, so it is necessary to take corresponding protective measures.

Conservation of cabbage

Cabbage is more cold-tolerant, likes a cold climate, so it is suitable for growing in the cold season, if it is cultivated in the high temperature season, it is prone to diseases and insects, or the quality is poor, and the yield is low, so it is not suitable for cultivation in the summer and bright seasons.

After cabbage produces pests and diseases, it can release natural enemies, such as predatory mites, parasitic wasps, etc.; the use of biopesticides such as Bacillus thuringiensis, avermectin, etc.; Biological fertilizer can also be applied.

Cabbage is suitable for planting in loam, sandy loam and black loess that retain fertilizer and water and is rich in organic matter, not suitable for planting in sandy soil that is easy to leak water and feces, and not suitable for planting in clay soil with poor drainage.

Cabbage headless seedlings are usually caused by vegetable borers, and their larvae are also known as borers, heartworms, cabbage borers, cabbage borers, radish borers, etc. , among which autumn-sown cabbage suffered the most. The damage period of vegetable borer is mostly from August to October, so this period is also a critical period for control.

It is mainly larval erosion and destruction. The 1-2 instar larvae crawl onto the cabbage sum, spin silk and stick to the leaves, and eat the cabbage sum, causing lack of seedlings and seed destruction. After the leaves of adult cabbage are eaten, the phenomenon of "unkempt cabbage" is formed, which leads to stagnation of plants or weak root growth, and finally the whole plant withers, loses the utilization value of the whole vegetable, and seriously reduces the yield.

After 3 years of instar, eat up the petioles, eat up the stem pith or roots, forming a short bag-like tunnel with obvious cavities, filaments outside the hole, and insect feces, so that the Chinese cabbage can not form balls. Wounds caused by larvae are also susceptible to soft rot.

Combined with field operations such as seedlings and seedlings, pull out insect seedlings and remove pests. According to the habits of larvae spinning silk, forming nets and clustering, the larvae in the heart leaves are manually killed in time, which saves labor and time and has a significant effect. Bugs mainly eat cabbage hearts, which can lead to lack of cabbage seedlings or no heartless seedlings.

Sometimes, seedlings stop growing and eventually wilt and lose their value, resulting in a decrease in yield. Slightly larger bugs will make holes in the plants, and the appearance of filaments will cause the cabbage to knot. Insect bite wounds can also cause soft rot.

Choose a piece of land that is well-drained, relatively breathable, and has fertile soil. After ploughing, loosening and leveling, sowing is done in the wetland.

Sowing, after the seeds germinate in the later stage, the Chinese cabbage seedlings become denser and denser. At this time, thinning is required, on the one hand, the gaps between the seedlings should be cleared, which is conducive to the ventilation of Chinese cabbage seedlings, and on the other hand, soil fertilizer should be provided for the later stage of Chinese cabbage. Chinese cabbage seedlings grow slowly after being destroyed by vegetable borers.

In severe cases, the entire plant will wilt, resulting in reduced yields. Many farmers believe that they are infected with soft rot, which leads to poor control results. However, hairy wounds bitten by larvae are prone to soft rot and need to be careful.

According to the climatic conditions, the sowing date should be adjusted appropriately to avoid the high incidence of vegetable borer and reduce insect pests. After the harvest of the previous crop, the diseased leaves are removed, the soil is deepened, and the source of pests is reduced.

The main reason for the headless seedlings of Chinese cabbage is the scourge of cabbage insects. Chinese cabbage is one of the most susceptible to insects, especially the cabbage sum part, which is particularly easy to attract insects due to its relatively tender reasons.

In fact, it is very likely that these Chinese cabbages do not absorb enough nutrients or suffer from insect infestations.

This is what was washed away by the heavy rain, and it may be said that the heavy rain was relatively heavy, so that the cabbage sum was missing, which is more terrifying.

During the planting of autumn cabbage by farmers, cabbage seedlings often appear radish head seedlings, many vegetable farmers do not know what the reason is, but in fact cabbage radish head seedlings are generally caused by vegetable years, vegetable larvae are called earthworms, insectivores, cabbage worms, cabbage hole thorns, radish holes, etc., autumn sowing is the most serious harm to cabbage. Most of the time when vegetables are harmed in various places is August and October, so this period is also an important period for prevention. It is mainly infested by larval borers.

The 1-2 instar larvae, crawl to the cabbage, spin silk, weave leaves, eat cabbage, lack of germination, destroy the seeds, gnaw the stems, form "Baotou cabbage", long growth, heartless seedlings and other phenomena cause the plant to stagnate growth, or the roots can not be thick and long, and the wounds caused by the final larvae are also easy to cause soft rot.

First of all, it is necessary to avoid continuous cropping of cruciferous vegetables. After harvesting, remove the stubble paddle in the field in time, turn the ground deeper, remove the overwintering pupa or flying moon hole pupae, and reduce the filling density of the field. Adjust the seeder according to the local situation, so that the branches and leaves of the vegetable seedlings are staggered with the peak season of the vegetables to reduce the harm of pests.

The sun does not rise in the morning, and sprinkling water before the dew dries can greatly reduce the harm of vegetables. Cucumber vine kilograms, kilograms of water, mash the juice, dilute and spray with 6 parts of water per dollar. 500 700 times of thuringiensis emulsion, or 1000 times of matrine emulsifiable concentrate, 2.

You can also use sprays such as 5% Rototown EC 1000 times.

Combined with seedlings, seedlings and other field operations, sprouts are used to remove pests. According to the habit of larvae spitting cobwebs and swarming injuries, the larvae in the heart lobe are captured and killed manually in time, which has the effect of success, saving time and remarkable effect. Leda 4-5 true leaves are vulnerable and should be taken at the first hatching stage of larvae and 3 years before larvae, and sprayed to the heart lobes as soon as the heart lobes are damaged or have silk meshes, as at the beginning.

10% chlorfenapyr suspension 1500 2000 times, or 50% sulfur emulsifiable concentrate 1000 times, or 18% insecticidal double preparation 800 1000 times, or 5% flupyridine emulsifiable concentrate 1500 times, 10% brompronil suspension 2000 times.

To prevent soft rot caused by cabbage worms, every 7 days or so, take 40 kg of spray precautions on 100 grams of water with 70% sugar-free sodium asiatica wet powder. According to the different seedling conditions, insect conditions, and weather, spray two or three times in a row, and be negligent before and after. Fields with severe soft rot can be treated with mosquito repellent first and then with mosquito repellent.

Pesticides should be used alternately, and the safety interval of pesticide use should be noted.