Chinese cabbage root swelling disease often appears, what is the cause of Chinese cabbage root swell

Chinese cabbage root swelling disease is a serious soil-borne disease of Chinese cabbage, the fungus overwinters in the soil or adheres to the seeds with dormant sporangia, and the tumors on the taproot are mostly close to the upper part, larger and less numerous, spherical or nearly spherical, uneven, rough surface, and sometimes the epidermis is cracked.

The spores of root swelling can be transmitted through soil, seeds, vegetables, agricultural machinery, means of transportation, irrigation water and rainwater, and other human factors, insect factors, etc. It mainly harms cruciferous vegetables such as Chinese cabbage, Chinese cabbage, cabbage, radish, rape, and rapeseed, and the most susceptible vegetable is Chinese cabbage. Because Chinese cabbage is a high-water and fertilizer crop, the tree body is fragile, and it is the most susceptible vegetable variety.

Cabbage root swelling is a fungal disease caused by Brassica rhizome, which can be spread through rainwater, irrigation water, agricultural tools and agricultural operations. It occurs only in cruciferous vegetables.

Chinese cabbage is a vegetable that many people like, and many people will stir-fry a plate of Chinese cabbage in normal times. When planting, Chinese cabbage will be harmed by Chinese cabbage root swelling disease, which is extremely harmful and widely distributed, which will cause a large loss of Chinese cabbage yield every year, and sometimes even lead to a single Chinese cabbage not harvested, which has a very serious impact on the Chinese cabbage industry. Chinese cabbage root swelling generally occurs in May and November, and this period is the peak of the disease.

Symptoms of Danger: Chinese cabbage root swelling disease, as the name suggests, will harm the roots of Chinese cabbage. At the beginning of the disease, the roots of Chinese cabbage will have tumors, and the surface of the tumor is smooth and spherical in shape. In the later stage of the disease, the roots of the Chinese cabbage will become rough and even cracked, and it is easy to be infected by other bacteria, and some will also emit a foul smell.

Chinese cabbage root swelling will make the roots of Chinese cabbage swollen, and the tumors of the taproot are large, but the number is small, while the tumors of the lateral roots are smaller and the number is larger. Due to the impact on the roots, it will also harm the overall growth and development of Chinese cabbage, and the phenomenon of growth retardation will occur. <>

The incidence of Chinese cabbage rhizobia disease, most of them appear in May and June, if the summer and autumn of the year are rainy, the Chinese cabbage root swelling disease will be aggravated, and in the rainy season, the root swelling disease will also be aggravated. Not only that, but low-lying fields, acidic soils, or poorly drained fields are also prone to disease. And Chinese cabbage and germs will be scattered in the land in the form of buns, its resistance to the environment is very tenacious, and can even survive in the soil for seven or eight years, when the environmental conditions are suitable, the spores will be released from dormancy, and the Chinese cabbage will be infected.

Control methodsThe most common control method in agriculture is crop rotation, which can control pests and diseases, and is environmentally friendly and pollution-free, and simple to operate. You can also choose disease-resistant varieties when planting Chinese cabbage, which is more effective in preventing Chinese cabbage root swelling, and you can soak Chinese cabbage seeds in warm water at about 50 degrees for 20 minutes before planting. Because Chinese cabbage root swelling is easy to occur under the condition of low soil pH, it is necessary to adjust the pH of the soil in time.

Generally, it is very easy to get sick if the humidity is relatively high, so when planting Chinese cabbage, you must water less, and choose some land with more suitable pH, you can put some lime powder, and the temperature is generally about 20 degrees.

Chinese cabbage root swelling disease generally occurs during the growth period, and it must be timely at this time, otherwise there is no way to repair it even if you want to do so in the middle and late stages.

This is usually the case every summer, so be sure to pay extra attention in the summer to reduce it.

Root swelling is a common disease in Chinese cabbage cultivation, and Chinese cabbage root swelling disease** is the formation of dormant sporangia in the host cell by the pathogen. In the face of many problems, there are many experts, but there are many reasons, that is, because some of the fuselage in the bun some extremely deep cells, and then get some long-term life, which has caused some bad, impact, which we all know, the rotation time of the cabbage is 4 to 5 years, from this we can know that <>

It can effectively reduce the disease, and if it is said that it is the next time it is heavy, it is necessary to change the soil, and this is not easy, if it is necessary to plant on the original land, then it can be recommended to increase the lime and adjust the pH balance of the soil, which can reduce the probability of disease, and then one is to select some seedlings without secrets, some, varieties so that some of the finished products obtained after planting are relatively healthy, and they are used. There are also some varieties that are not diseased to be selected, so that some of them are obtained. <>

If it is said to use chemical methods, the first one is to do a good job of disinfection of seeds, generally before sowing is to soak in 55 warm boiled water for 15 minutes, and then use some appropriate, and then mix together, so that you can do some beneficial protection, there is also a program, that is, to aim at sterilization, in the process of planting in the vaccine, to use the appropriate concentration of lime water, can prevent some pests of the senior, so these are some more useful methods, The last one is that you can spray some appropriate pesticides, and then you can reduce these pests so that you can do very little damage to us, plants or vegetables. In agricultural planting, there will be many, many new and strange problems, so as long as we have the patience to find out, I believe that this problem will be solved. <>

The pathogen is Rhizoma brassica, which forms dormant sporangia in the host cell, which are spherical, unicellular, colorless or slightly gray, and densely appear as fish egg masses in the host cell. Dormant sporangia germinate to produce zoospores; Zoospores have biflagella and can swim short distances in water.

The bacterium survives in the soil for a long time and infects cabbage and other cruciferous plants through the soil. Therefore, it is necessary to maintain the temperature and humidity of the soil during the growth process.

The influence of some pests and diseases, as well as changes in the environment, the temperature difference is too large, there is not enough care, there is no frequent watering, etc., can cause cabbage root swelling.

It is mainly because the soil is infected with bacteria, which causes the roots to be damaged, so it will get sick.

First of all, we need to choose varieties with strong disease resistance when selecting seeds, and then disinfect and sterilize the seeds. Continuous cropping can not be implemented, and the crops before the soil are cruciferous should be avoided as much as possible, and some vegetables and fruits can be planted in rotation. If you want to disinfect the planting plot, you can use a suspension, such as a suspension, to mix it into the soil before sowing.

Take precautions, disinfect them regularly, and strengthen the management of the garden.

The harm of Chinese cabbage is that the skin of Chinese cabbage is not smooth, it will be rough, cracks, and it will rot and cause foul smell.

The danger of Chinese cabbage root swelling is that the roots of the cabbage will rot and then die in a large area, and the leaves will have brown spots and white bugs.

It will cause a large number of Chinese cabbage to die, affect the growth of Chinese cabbage, and there will also be cracks, which will emit a foul smell, which will lead to the deformity of Chinese cabbage.

It can be identified from the white appearance, because the cabbage with cabbage root swelling will have a lot of globular tumors and finger-shaped tumors, if these tumors appear, it means that the cabbage has been diseased, and it is necessary to carry out the cabbage in time.

The main way to identify it is that the cabbage is particularly sluggish when it should be grown, and. In the later stages, the leaves are always prone to yellowing and wilting, and there are also tumors of uneven size in the roots.

In the early stage of Chinese cabbage root swelling, the aboveground symptoms of the plant are not obvious, which mainly harms the roots, resulting in the appearance of finger-shaped, short-rod-shaped or spherical tumors of different sizes in the main root or lateral roots. The nodules on the taproot are close to the aboveground, and the surface of the nodules is smooth in the early stage of the disease, and the surface is rough, uneven and obviously cracked in the later stage.

Cabbage is one of the common vegetables in everyone's daily life, and the total area of cabbage grown in China is common and the production volume is large. In the planting process, it is more common to encounter cabbage root swelling disease, cabbage root swelling disease is often confused with less water, if not treated properly in time**, it will lead to cabbage roots can not absorb water, which seriously affects the production, sales and quality of cabbage. So how to do cabbage root swelling?

Next, let's take a look at the prevention and control measures of cabbage root swelling.

Root swelling disease is a fungal pest and disease, which cannot be observed normally in the early stage of the disease, and bacteria will invade the roots of cabbage, resulting in malignant tumors of various sizes in the roots. When the disease occurs for more than half a month, the plants on the road will slowly wither, the growth and development rate is very slow, and the growth and development will stop immediately after the disease. Then the leaves slowly turn yellow, and dry disease occurs, which is the most likely case to deceive farmers, and many people believe that it is caused by lack of water.

In fact, it is because the malignant tumor of the root is too large, which causes it to be unable to absorb water normally, and then the disease of dryness occurs.

There are only two factors that cause malignant tumors in the roots of cabbage, the first is caused by downy mildew eating the roots, which eats the roots and slowly swells the roots. If you find that there is no downy mildew when you pull out the disease, you can apply microscopic examination, if you see the presence of 5-6 side type bacteria, then it is likely to be the brassica rhizome that causes root swelling disease. Brassica rhizome is mainly ambushed in the soil environment, and then dispersed according to various substances such as diseased plants and moisture, resulting in large-scale root swelling disease in cabbage.

The incidence of rhizome disease in the disease is small, but according to experimental research, there have been cases of rhizome disease in every region in recent years, and it is still increasing. Brassica rhizome can survive in the soil environment for a long time, as long as the cruciferous vegetables and fruits are planted, it will develop diseases from time to time, and can also be dispersed with various insects with the help of fertilizer and water mobility in the soil layer. In particular, the disease is more severe when the temperature is rainy and the fields are relatively wet, and the spring of each year is the period when root swelling is common.

In the process of taking seeds, we must select the species with strong disease resistance, and then do a good job of disinfection and sterilization of the seeds, and can use the double granules of seed dressing for seed dressing. Heavy stubble can not be implemented, the crops in front of the soil layer are cruciferous and planted as much as possible, and some fruits and vegetables can be planted in rotation. For the planting land, it is necessary to carry out disinfection and sterilization, do a good job in prevention work, disinfect and sterilize on time, and strengthen the management methods of vegetable gardens.

The above is about the pathogenesis of cabbage root swelling disease, the law and its prevention and control countermeasures, to select the resistant species for planting, before sowing to disinfect and sterilize the seeds and soil, can not carry out heavy stubble, to prevent rotation with cruciferous green plants.

1.It is strictly forbidden to transport seedlings and vegetables from the sick area, 2Moisten the irrigation so that the pH is kept in between, 3Choose disease-resistant varieties. 4.Crop rotation and stubble. 5.Eradicate cruciferous weeds in the field in a timely manner.

The root disease of cabbage mainly harms the roots of cabbage, which will lead to different sizes of taproot or taproot, and prevention can be selected to pre-seedling in disease-free land or newly cultivated land to improve alkalinized soil planting.

It may cause uneven surfaces, which may affect nutrients, may weaken growth, and will lead to the death of seedlings. At this time, it is necessary to use pesticides in a timely manner, and also remove the problematic parts.

It can cause uneven ground surface, affect nutrients, weaken growth, and cause seedlings. Be sure to make pesticides in time and drop the problem part.

Tumor disease is mostly seen in the roots of cabbage, from the seedling stage of cabbage to the seedlings are damaged, pull out the roots of cabbage, it is not difficult to find, there are different sizes of nodules and bumps, distributed on the root system, the nodules on the main root are large and few, the nodules on the lateral roots are many and small, showing irregular shape and spherical host vegetables are infected by the root rhizoma fungus, the roots form tumors and gradually swell, deformed, the surface of the tumor becomes smooth and rough, and then cracked, uneven, often suffer from the infection of other miscellaneous bacteria and rot and stink.

In the early stage of the disease, the surface layer of the tumor is smooth and clean, and the surface layer is not smooth, convex and uneven, and significantly cracked in the middle and late stages. The malignant tumors of the taproot are as large as raw eggs, and the total number is reduced, the malignant tumors of the main root are not large, and the malignant tumors of the root tendrils are usually in a string, and the large ones are as large as 20. Carry out seed treatment, soak the seeds in 55 warm soup for 20 minutes, and stir the seeds constantly; 15 minutes of potassium permanganate solution soaking; 1 150 times lime water immersion 15 points; 70% chlorothalonil wettable powder 600 times liquid soaking for 20 minutes; Untreated seeds were used as a control.

The main method to prevent and control cabbage root swelling disease is to select excellent seeds for sowing and can not be cropped continuously, and implement crop rotation with non-cabbage vegetables for more than three years. The second is to use quicklime for disinfection and sterilization of the soil, and can neutralize the pH value of the soil. The important factors that cause this disease are soil temperature, humidity and pH.

When the soil pH is 18-25 or the water content is 70%-90%, it is more conducive to the infection of pathogens, and the soil rarely occurs this disease.

Apply well-decomposed organic fertilizer to avoid excessive use of chemical fertilizers to prevent soil acidification, and you can also apply quicklime during land preparation, which can improve the pH of the soil. Prevention and control methods: choose disease-resistant varieties.

Collect seeds on disease-free plots or disease-free plants to reduce the possibility of germs in seeds. Seed sterilization. Wet mix with seed weight of ethylene phosphorus aluminum, and then dry mix with 50% Fumei double dry mix of the same weight; or 45% dysenium 400 times liquid soaking.