Root swelling disease is a common disease in Chinese cabbage planting, what is the cause of Chinese

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.

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.

Chinese cabbage root swelling disease is a common disease in some vegetables in acidic soil, low-lying areas with high humidity and water accumulation or flat dam areas, due to its pathological characteristics, many drugs have a certain effect on it, but few can.

It is mainly spread by plant seeds in a large area, and is mainly spread by seedlings, agricultural machinery and water sources in the region. The thick denier spores of root swelling disease can survive for 8 10 years when the soil moisture is relatively large (water-upland rotation), and 6 8 years when the soil is relatively arid (continuous dry farming) Control method: control seeds**.

Seedlings are introduced from areas where there is no root swelling disease, and the quarantine system is strictly implemented to avoid seeds carrying bacteria. Improve the soil. When planting in areas where root swelling is common, sprinkle slaked lime on the field 7 to 10 days before sowing or planting.

Seedbed disinfection. The seedbed can be sprayed with 500 times of 50% sodium disulfonate soluble powder or 10% cyanofrostazole suspension 1000-1500 times of liquid, and the depth of soil is about 15 cm. For the prevention and control of Chinese cabbage root swelling, 1000 times 20% methyl licumin phosphorus emulsifiable concentrate aqueous solution or 800 times 50% pentachloronitrobenzene wettable powder aqueous solution or 600 times 14% copper ammonia aqueous solution or 800 times 70% thiophanate-methyl root irrigation, once every 5 6 days, 2 3 times in a row, can control the onset of the disease.

If seriously diseased plants are found in the field, they should be harvested or uprooted in time to reduce the source of disease and prevent the spread. In particular, it should be checked and treated before heavy rain or irrigation. After the diseased plant is removed, lime water can be sprayed in the hole for sterilization.

The soil may be acidic, and the fields are sprinkled with hydrated lime 7 to 10 days before sowing or planting, at a rate of 70 100 kg per mu.

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.

1. The surface of the tumor is smooth in the early stage of the disease, and the surface is rough, uneven and obvious cracks in the later stage. The main root tumors are as large as eggs and are reduced in number, the lateral root tumors are small, and the fibrous root tumors are often in clusters, as large as more than 20.

2. The damage mainly harms the roots, resulting in the appearance of nodules of different sizes in the main roots or lateral roots, similar to fingers, short rods or balls. The leaves gradually turn yellow from the bottom up, and the plants wilt around noon on sunny days, as if they are dehydrated or malnourished.

3. Agricultural prevention and control 1It is strictly forbidden to transport seedlings and vegetables from the diseased area to protect the disease-free area, strictly select disease-free land or newly cultivated land for seedlings, and pay attention to eliminating diseased seedlings when transplanting and planting. 2.

Improvement of acidified soil. It has been found that soil acidification is one of the main factors that induce Chinese cabbage root swelling. The application of quicklime and silica powder to adjust the pH of the soil to prevent and control the disease is better, in order to adjust the pH of the soil, apply 100 kg of quicklime per mu of seedbed before sowing, and then moisten the irrigation, so that the pH value is kept between, the seedbed soil is alkaline, and the incidence of root swelling of Chinese cabbage seedlings is significantly reduced, which is a simple and easy technical measure.

Cabbage root swelling causes tumors of varying sizes in the taproot or taproot that are close to fingers, short rods, or spherical shapes. In the later stage of the disease, the diseased part is easily infected by soft rot bacteria, the tissue decays, exudes a foul smell, and the leaves slowly turn yellow from the bottom up.

The best way to fundamentally solve root swelling disease is to choose disease-resistant varieties;

It is strictly forbidden to transport seedlings and vegetables from the diseased area to protect the disease-free area, strictly select disease-free land or newly cultivated land for seedlings, and pay attention to eliminating diseased seedlings when transplanting and planting.

When harvesting, it is best to uproot and bury the diseased roots in a pit 45-60 cm deep, and apply lime powder to promote the rot of the roots and the death of pathogenic bacteria.

It may attract some insects, which will make the cabbage particularly bitter. Malnutrition. Think you can put a scarecrow. Get some pesticides every day.

The harm is that it may make the growth rate of cabbage low, and the survival rate is very low. I think you should spray some pesticides every day.

The disease causes the cabbage to rot entirely, and insecticides can be sprayed regularly to prevent insect infestations.