What are the causes of cherry root cancer?

Symptoms of Cherry Root Cancer: Root cancer is a disease caused by an infection. Presents with the formation of cherry root carcinoma in the root neck or lateral roots, also known as root carcinoma.

Most cancers occur in the root neck of the subsoil, where the junction between the taproot and lateral roots, where bacteria invade from the wound and form tumors. In the initial stage, the tumor is milky white or reddish-brown, and in the next stage, the tumor is lignified. Cherry root cancer, also known as cherry sarcoidosis, is a disease caused by bacteria.

It mainly harms cherry grafting sites, taproots, root necks and lateral roots. **Different.

It can be divided into non-infectious gum disease and intractable infectious disease. It can be expected that 07 root cancer tumors mainly occur in the rhizome below the mouse, the junction between the taproot and the lateral root, or the healing site of the scion and rootstock, and the following small series will detail the symptoms, risks, causes, and symptoms of cherry root cancer. Root cancer, also known as radic, bile and crown cancer, and root head cancer, occurs mainly in the root neck and large roots, and sometimes in the lateral roots.

Root cancer is a major cherry disease caused by Agrobacterium tumefaciens in the soil. It is a worldwide bacterial plant disease. A pathogen is a short-lived bacterium, not a cellular carcinoma of an organism.

It kills and suppresses areas of water tumors during the day. The pathogen that causes the carcinogenesis of sweet cherry roots is Agrobacterium tumefaciens, which belongs to Agrobacterium tumefaciens and is widely present in the soil, mainly damaging the root neck, the connection between the taproot and the lateral root, and the healing of the slope and the root. The internal tissues are very soft.

The most definite cause is cherry root cancer, cherry root cancer: also known as rhizobia, bacterial disease. The diseased area is white or reddish in color, smooth and soft, and then gradually turns brown, lignified and hard, rough and irregular.

Severely affected, poor growth, short plants, few fruits, poor quality, also caused by Agrobacterium tumefaciens in the soil; Five fungi were isolated from the Big Cherry Research Institute of Yantai Academy of Agricultural Sciences; In cherry gum disease, several scholars have divided the rough surface, and the surface gradually thins as the tumor increases.

The cause of root cancer of cherries is that there are bacteria on the ground cortex of fruit trees, the soil is not well drained, the soil is cohesive, and the soil moisture is relatively large.

It is very likely that there is a harm of this virus or bacteria appear in the soil, in which case it will form cancer, and there is a special virus in it, which causes a large bacterial infection.

This is because when choosing the soil, it is not conducive to the growth of its roots, and it is some alkaline soil, and if you water too much in your daily life, there are many small pests on it that will cause cancer.

Infection with Agrobacterium tumefaciens caused by bacterial infection, which is why this situation occurs, and it is necessary to pay attention to the growth of plants.

1. Root cancer pathogens mainly overwinter in the bark of fruit trees, and can also overwinter in the soil, and the pathogens can survive in the soil for more than one year. 2. Root cancer pathogens are mainly invaded by grafted wounds and insect wounds, and can also spread through rainwater, irrigation and pruning. 3. Heavy soil clay or poor drainage in the cherry orchard may cause root cancer.

Root cancer is caused by Wild Bacillus in the soil, which overwinters in the diseased tissues, mostly in the surface layer of the cancer, and when the outer layer of the cancer is decomposed, the bacteria are washed down by rainwater or irrigation water and enter the soil. Bacteria can survive in the soil for a long time. It can be invaded by grafted wounds and insect wounds, and the soil temperature is most suitable for the formation of cancer tumors at 18 22.

Symptoms usually manifest after 3 months. Soil and diseased plant pathogens are spread through rain, irrigation and pruning. Neutral and slightly alkaline soils were more diseased than acidic soils, and heavy crops and vegetable orchards were more diseased.

The degree of incidence is also related to the rootstock species.

Control method: choose rootstock resistant to rhizobia. For example, Mahali cherry, Chinese cherry, and tart cherry have relatively strong disease resistance, while sweet cherries have weak disease resistance and serious disease.

Seedling quarantine. The seedlings must be quarantined, avoid the use of bacterial (tumor) seedlings, and avoid heavy stubble.

Choose disease-free seedlings for planting. Root staining prophylaxis with the anti-root cancer agent K84 from China Agricultural University [1].

Diseased Tree**. Seedlings or large trees with serious disease should be removed and scraped off (the tumor is disposed of), and then mixed with anti-root cancer agent K84 and water in a ratio of 1:1, apply 10cm on the affected area and 10cm below the roots, after using K84, fungicides can not be used, otherwise K84 will be invalid.

Reduces wounds. Graft with bud grafting as much as possible to narrow the grafting wound, and pay attention to the prevention and control of underground pests such as grubs to avoid root wounds caused by insect pests.

The germs overwinter in cancerous tumors and in the soil. Diseases occur most often in nurseries. Infection of the fungus begins at the germination stage of the seed, but it can also infect uninjured roots.

Generally, it invades the cortical tissue through wounds (insect wounds, mechanical wounds, grafting joints, etc.) and begins to multiply and inject infusion into the root system. For diseased young trees, the control method of treating bacteria with bacteria is adopted, the root soil of cherry trees is opened, and the soil is buried after watering with 25-35 times of K84 biological bacterial solution, which can inhibit the growth of rhizobia pathogens and make them lose their pathogenic ability.

Root nodules in cherry trees are caused by root cancer, which occurs mainly in the rhizomes of cherries, but also in the lateral roots. Root cancers vary in size, spherical or irregularly shaped. At the beginning of the disease, milky white or slightly reddish, smooth, soft, after gradually browning, rough surface 4 20 The shelf life of the bactericide is 4-6 months, and the proportion of seed dressing is 1:

5 (w w), the proportion of seedlings before false planting or planting is 1 kg treatment of 40 50 plants, the control effect is more than 95%, and the input-output ratio is about 1:30.

Pharmaceutical prevention and control: spray No. 8 fungicide for prevention and control at the beginning of the disease, spray 1 time every 5 7 days, 3 4 times in a row. Focus on spraying the base of the diseased plant and near the surface.

The last spraying to harvest is carried out in strict accordance with the relevant pesticide safety interval regulations. , the growth of the tree with rhizobia disease will weaken and the yield will be reduced. Saplings with rhizobia are the most taboo in our agricultural planting.

Absolutely not planted. Not only is it easy to die seedlings and develop poorly, but even the fruiting period has a great impact, which directly affects the yield and quality, and the future is endless.

The central nodule of the root group, the tumor is born in the center of several main roots, connects and can affect a plurality of taproots, is entrenched in the root center, is sandwiched by a plurality of thick roots, and resembles a clod, is not easy to find, the tumor is large, irregular, and difficult to eradicate; Lateral nodules of coarse roots. The pits where the nodules grow on the side of the big roots are dug in advance with a trencher, and I first water each pit and moisten it. This was poured on me by an experienced cherry grower in our local area!

Put all the rhizobia trees together and sprinkle the fungicide on the roots first.

In the initial stage, the shape is like a gray-white tumor, the internal tissue is very soft, and then the tumor gradually grows, the surface gradually turns brown to dark brown, the surface cells die, the internal lignification, the texture is hard, the surface is rough, and gradually cracked, mostly spherical or oblate spherical, and later it will grow particularly like a walnut, and it will also cause the leaves to yellow and fall.

There will be nodules in the roots, and there will also be a lot of gray-white nodules, which will rot, and the internal tissues are relatively soft, and the leaves look withered, and the nodules are of different sizes.

You will find some tumors, and there will be white tissue, which will slowly turn brown, and the hardness will become harder and rougher, the leaves will turn yellow, and the plants will become smaller.

The surface of the cherry is very wilted, and the branches and foliage are also very wilted, and the land is also very arid, with some red spots, and the distribution is not very even.

Cherry root cancer, also known as cherry rhizobia, is a pest and disease caused by pathogens, which mainly affects the grafting site, main stem, root neck and taproot of cherry trees.

1. In the pre-stage of cherry root cancer, the disease site produces gray-white malignant tumors, the surface layer is not smooth, and the internal organs are soft and milky white. After the growth and development of the carcinoma of cherry root, the outer skin atrophies and becomes dark brown to dark brown, the internal structure is hard and wooden, and the surface layer often grows and develops sparse and delicate root hairs.

2. Generally, the nodules of the root nodules are globular or oblate, the size is different, the injured cherry tree is long and weak, the stem is short, the leaf yellow becomes early fall, the fruit is late, the fruit is small, and the cherry tree is more serious when it dies.

1. The key to rhizobia is to spend the winter in the epidermis of the peach tree, and it can also spend the winter in the soil environment, and this pathogen can survive in the soil environment for more than a year.

2. The key to rhizobia is to enter the cherry tree according to the grafting wound and insect wound, and it can also be spread by precipitation, watering and pruning.

3. The clayey soil or poor drainage pipes of the cherry orchard are likely to cause root nodules.

4. At the ground temperature of 18 22, it is most suitable for root cancer, and soil moisture content is also beneficial to root cancer.

1. Pull the cherry tree at the end of the marriage and choose the crocos with nodule resistance, such as cherries and tart cherries, which can reduce the production of nodules.

2. In the rainy season, it is necessary to do a good job in the drainage of cherry orchards, and when planting, it is not necessary to damage the roots and near roots of cherry trees, and do a good job in the remediation of cherry tree diseases.

3. For seedlings that are likely to have root cancer, infiltrate the roots into 30x aqueous solution of root cancer disease or 2x to 4x aqueous solution of anti-root cancer agent before planting.

4. If a cherry tree with serious rhizobia or a dead tree is found, it should be immediately eliminated from the garden and burned.

5. If a soft root of a cherry tree is found to be cancerous, the malignant tumor should be completely removed first, first with a knife, followed by 80% ampicillin, oxytetracycline bacteriostatic agent 402 fresh cream 100 200 times liquid or 800 1400mg kg should be used to kill the germ in the wound, and then agricultural streptomycin should be used to avoid malignant tumors. This malignant tumor should be burned immediately.

What do you know about cherry root cancer?

Cherries are very tasty fruits, so what do you know about cherry root cancer?

First, sweet cherry root cancer is also known as rhizobia and coronary gall disease. In the Tianshui area, the pathogen that causes sweet cherry root cancer is Agrobacterium tumefaciens, which belongs to Agrobacterium and is widely present in the soil. The fungus mainly harms the root neck, the junction between the taproot and the lateral root, and the healing of the scion and the rootstock.

Radicular disease, at the beginning of the root system, the tumor is milky white or reddish-brown. As the tumor grows larger, the color gradually deepens to dark brown, the interior is lignified, the texture becomes hard, and the epidermis is rough and cracked.

The causative bacterium of the second cherry root cancer disease is Agrobacterium tumefaciens. The pathogenesis of root cancer is that Agrobacterium tumefaciens in the soil invades through the root wound and forms tumors at the site of infection. Corona gall cells have an abnormal ability to grow uncontrollably.

When there are no plant hormones in the medium, these cells can grow normally, and this growth characteristic can be maintained even in the absence of Agrobacterium. Based on this inference, there is no drug for cherry after being infected with root cancer**.

The third route of transmission. Root cancer bacteria are mainly found in the cortex of tumor tissues. After the outer layer of the tumour is broken down and destroyed, the bacteria enter the soil and can spread through rainwater and irrigation water.

Subterranean pests and nematodes can also transmit bacteria, and seedlings are the main route of long-distance transmission. In the early stages of the disease, there was no significant effect on the root system and aerial parts of the tree due to the small size of the tumor. With the increase of tumors, the growth of the root system is hindered and the number of fine roots decreases, which seriously affects the growth of trees.

Fourth disease symptoms. The tumors are oval or irregular in shape and vary in size. Root cancer can occur in many parts of the tree, usually in the root neck, lateral roots, straight roots, and junctions.

The tumour is spherical or irregularly oblate-spherical, milky white to milky yellow at birth, and gradually changes from light brown to dark brown. The internal tissues of the tumor are parenchyma cells at first, and the callus is formed with the formation of callus, and the surface of the tumor is rough and uneven.

The main harm is that it will affect the harvest of the fruit, affect the sweetness of the cherry, directly reduce the yield, and also cause the entire root system to rot or dry up. It is easy to cause the fruit of the cherry to be very small and not bright enough.

It is easy to cause all the cherries to die, and it is also easy to lead to a large reduction in yield, the leaves will shrink, and the leaves will have a lot of spots, the fruit will become smaller, and the leaves will be severely yellow, will fall, the growth will be particularly slow, and the plant is particularly short.

Once there is this disease, it is basically very difficult, and it will continue to spread through the disease, resulting in some leaf changes and slow wilting. Because this type of disease cannot be suppressed by medication, it is called cancer.

The damage is still more serious, for example, it will cause a lot of spots on the surface of cherries, and it will also affect the taste of cherries, and it will also affect the quality and yield of cherries, and the plants are relatively short, and the leaves are also yellow.

It will cause serious problems in the root deformity of the plant, unable to absorb nutrients normally, cause a large number of seedlings to die, and will also cause a large area of leaves to fall off, which will greatly reduce the yield of cherries