Chinese cabbage virus disease is very common, how to prevent and control Chinese cabbage virus disea

It often forms depressed necrotic spots on the veins on the back of the leaves, and the plants are deformed, dwarfed, and do not bulb or have a soft and empty shell feeling. Diseased plants sometimes appear crooked, half of them are shrunken, half of them are withered, and half of them are balls, so vegetable farmers call them cabbage half crazy. For the prevention and control measures, it is recommended to take agricultural, physical and biological control as the main and chemical control as the supplement.

First of all, growers need to rotate crops reasonably to avoid continuous cropping of cruciferous vegetables {During the growth of cabbage, it is necessary to pay attention to removing diseased leaves in time.

As much as possible, choose the fields of wheat, rice, and leguminous crops to plant cabbage, and avoid continuous cropping with Solanaceae, melons and other cruciferous vegetables; Turning the ground as soon as possible to promote the decomposition of diseased and disabled bodies; Planting with deep furrows and high compartments; selection of disease-resistant varieties; sowing at the right time; : 500 times of 75% chlorothalonil wettable powder, or 150 200 times of 40% aluminum triethylphosphonate wettable powder, or 600 800 times of downy mildewcarb, or 64% frost. Manganese-zinc wettable powder 500 times liquid spray control.

In summer, the climate environment of high temperature and high humidity is prone to disease, and in addition, continuous cropping and improper fertilization will also lead to disease. The same planting of soil and seed disinfection treatment, scientific and reasonable fertilization, a balance of fertility, difenoconazole, thiamium copper spraying control and selection of high-quality and disease-resistant Chinese cabbage varieties. High-quality Chinese cabbage has disease resistance, and before planting Chinese cabbage, the seeds are coated with antibiotics to prevent Chinese cabbage root rot and soft rot.

Pests of cabbage can be divided into pests at the seedling stage and pests at the bulbous stage. Insect pests at the seedling stage, with yellow-striped jumping beetles. Cabbage worms.

ground tigers, etc. The insect pests in the bulbous stage of cabbage are mainly aphids. This aphid directly harms cabbage.

Mild ones cause wounds and plant impacts. Large white powder infected with downy mildew, in the early stage of the disease, there is a white mold layer on the back of the leaf, on the front of the leaf, there will be light yellow or yellow-green lesions, due to the restriction of the leaf veins, the lesions will show an irregular shape.

The key point of Chinese cabbage virus disease prevention and control is to choose disease-resistant varieties, when planting, to apply foot fertilizer, increase phosphorus and potassium fertilizer, control the amount of nitrogen fertilizer, encounter the dry season must be watered frequently, cool and moisturize, promote the growth of cabbage roots, so as to improve the ability to resist disease.

These symptoms of Chinese cabbage are caused by a viral infection. These viruses can overwinter on seed skins, weeds, and then spread by aphids. When encountering unfavorable weather conditions such as high temperature and drought after Chinese cabbage sowing, aphids multiply in large quantities and spread poison, and the disease is serious.

In particular, the seedling is susceptible to virus diseases before the six-leaf stage, and the earlier the onset of the disease, the more serious the damage. Therefore, the key period for the prevention and control of Chinese cabbage virus disease is the seedling stage and the early growth stage, in these two periods to control aphids in time, you can choose to use 10 acetamloprid 1500 times liquid or avermectin and other agents, spray once every 5-7 days, twice in a row, and reduce the base number of insects. Agricultural prevention and control should not be neglected, one is seed disinfection, and the other is timely removal of weeds, creating an environmental conditions conducive to plant growth, which can reduce the disease.

1. Choose disease-resistant varieties: Yangchun, Jianchun, Xiayang 50, Xiafeng, Jinlu 55, etc. 2. Late sowing at the appropriate time, so that the sensitive period of the disease can be postponed to the cold season, so as to avoid the onset conditions and reduce the onset of the disease.

3. Avoid continuous cropping with cruciferous vegetables. Diseased plants are found in the field and removed in time to reduce the spread of pathogens.

At the seedling stage, the heart leaves are bright veins or leaf veins lose green, and then produce uneven green spots or flower leaves, the adult leaves are seriously shrunk, and many small brown spots are born, and the plants are obviously dwarf and deformed, and they do not bulb or bulb loosely. Yellow-green mosaic symptoms appear, brown necrotic spots or streaks appear on the veins, and sometimes the leaves are tilted to one side. When the plant is severely shortened, it can not be cored, and although it can be cored in the middle and late stages of disease, the necrotic point inside the leaf bulb will rot, and even if it does not rot, it will lose its commercial value.

When the cabbage encounters continuous rain or sudden high temperature weather, it is easy to rot roots and yellow leaves. Therefore, some potassium dihydrogen phosphate plus carbendazim should be sprayed for prevention. When the above diseases occur, spray with Jinggang thiofir or thiophanate-methyl plus potassium dihydrogen phosphate mixed with water or water to water the roots**.

Advocate the priority use of "four inducements and one network" green prevention and control technology, when using chemical pesticides, should purchase three complete certificates of agents, and strictly follow the relevant requirements when using. Pesticides should be used alternately, and the safety interval should be strictly controlled.

The control of cabbage insect pests should adopt comprehensive control, physical control, chemical control, and agricultural comprehensive control: first, it should be rotated with non-cruciferous cropsThe second is to remove the diseased leaves and old leaves in the garden in a timely manner, and make centralized treatment;The third is to set up insect nets;Fourth, trapping adult insects. Then in the agricultural prevention and control measures, the main thing is to deal with the weeds in the cabbage planting plot, of course, there are some dead seedlings and seedlings eaten by such pests, which must be pulled out in time, and then used.

Pests are controlled by using pathogenic microorganisms such as fungi, bacteria, viruses and other groups. Fungus insect control is a very safe means of control, no harm to people, livestock, crops and microorganisms, is conducive to maintaining ecological balance, and the control effect is very good, the use of one percent of lime water or 3% of superphosphate leaching solution, in the peak or peak period of cabbage worm oviposition, foliar spraying twice, can inhibit its oviposition, to achieve the purpose of prevention and control.

Strengthen on-site management. The year of the epidemic of the disease was changed to direct seeding and reasonable dense planting;Pay equal attention to base fertilizer top dressing, timely top dressing, pay special attention to fertilization at the lotus sitting stage and fertilization at the ball sitting stage, spray foliar nutrients and zinc phosphate aqueous agent, and promote the early growth and rapid growth of plantsCovering gauze with a small arch canopy has an obvious effect on disease prevention and yield increase.

1.Selection and selection of disease-resistant varieties;2.Strengthen field management, pay equal attention to base fertilizer and top dressing, and timely top dressing;3.Spraying control;4.Do a good job of avoiding aphids, trapping aphids, and preventing aphids.

Pesticides. Because after my cabbage is sprayed with pesticides, it will not be able to get sick from the virus, so it should be treated with pesticides to prevent and control it.

Pesticides. Because pesticides can be a good way to prevent and improve viral diseases, pesticides can be used to prevent and control them.

You can buy some special pests and diseases drugs, spray preventive drugs around the soil, is the cabbage, and also fertilize and water.

Fertilization should be applied, pests and diseases should also be eliminated, and disease-resistant varieties should be selected, so that the virus of bok choy can be well controlled, and the effect is also very good.

In the early stage, you must buy some pesticides and seeds to mix and plant together, so that you can play a role in prevention and control.

Cabbage virus disease can be prevented with aphid-killing drugs. This virus is usually caused by the presence of aphids.

I think cabbage virus disease is a disease caused by a virus, if we want to better prevent and control this cabbage virus disease, we should take corresponding measures in advance and spray some ** drugs on the surface of cabbage.

It may affect the yield of cabbage, and it will cause a lot of viruses to occur in cabbage, and the yield will be particularly low, and it will also bring some other bacteria, and it will also affect the development of other vegetables, etc., these are the hazards of cabbage virus disease.

Cabbage virus disease often occurs, cabbage virus disease is very harmful, it will directly affect the yield and quality of cabbage, will greatly reduce the yield of cabbage. This will cost many farmers money, and it will also affect the planting in the coming year.

The harm is particularly serious, first of all, it will lead to a lower yield of cabbage, and it will lead to a slower growth rate of cabbage, and the plant is relatively small, which will also cause deformity, and it will also affect the quality of this vegetable.

There will be symptoms such as yellow spot, necrosis, shrinkage at the seedling stage, and shrunken heart leaves, and the symptoms of bright veins appear in the heart leaves of seedlings, and then fade green along the leaf veins, turning into light green and dark green flowering leaves, and the leaves at the adult stage are hard and brittle, and the flowers and leaves, the plants are shrunken, and the growth is slow, and the core can not be wrapped normally.

The color of this leaf becomes pale or mottled green, and the shade is uneven. There is necrosis of the leaves.

At the time of onset, the damage is serious, which can cause a large reduction in yield, or even no harvest. Chinese cabbage virus disease is mainly manifested as the loss of green color of new leaves along the leaf veins, uneven color of the leaves, increased deformation of leaves, deformity and shrinkage, and death due to the inability to wrap the core normally.

You will find that the leaves of the cabbage have brown spots, and these spots are all over the vicinity of some leaves, and the whole leaf seems to be broken, and the cabbage grows relatively small and does not look fresh.

There will be symptoms such as yellow spot, necrosis, shrinkage at the seedling stage, and shrinkage of the heart leaves, the seedlings will fade green along the leaf veins, and become light green and dark green flowers, and the leaves will be hard and brittle at the adult stage, and the flowers and leaves will shrink, and the growth will be slow, and they can not be wrapped normally.

Chinese cabbage virus disease, also known as solitary disease, "convulsive disease", is the most common occurrence of Chinese cabbage production, the most serious, one of the most difficult diseases to prevent and control, and downy mildew, soft rot and called the three major diseases of Chinese cabbage, the general epidemic year can cause about 10% of the yield loss, some reoccurring years can reduce the yield by more than 30%, serious plots can even lead to no harvest, seriously affect the yield and quality of Chinese cabbage. What are the harmful characteristics of Chinese cabbage virus disease and how to prevent and control it?

Symptoms of harm. Chinese cabbage virus disease mainly occurs in the Chinese cabbage cluster to rosette stage, especially in the 6 10 leaf stage of Chinese cabbage, which is called the sensitive period of susceptibility. At the seedling stage, the heart leaves produce bright veins or leaf veins lose green, and produce mottled light green and dark green.

And the shrunken leaf curls occur, and the dorsal veins of the leaves produce brown necrotic spots or streaks, resulting in the shrunken and uneven leaves. The disease occurs at the adult stage, the leaves become hard and brittle after being damaged, the color gradually turns yellow, the whole plant rapidly dwarfs, grows slowly, or even stops growing, and cannot be coated normally. Some of the outer leaves are normal, but there are brown necrotic spots on the inner leaves, the leaves of the seriously diseased plants are shrunken into clumps, the leaves are hard and brittle, the leaf surface is densely covered with brown spots, and there are brown necrotic spots on the dorsal veins of the leaves, and cracks appear, and the plants are seriously dwarfed, shrunken and deformed, and do not form balls.

Loss of edible value and commodity value.

Causes. After sowing cabbage, in case of high temperature and drought, the ground temperature is high or lasts for a long time, the growth and development of the root system is inhibited, the aboveground part does not grow, the plant disease resistance decreases, and the virus incubation period is shortened. The peak occurrence period of aphids in spring and autumn coincides with the susceptibility period of cabbage, and it is easy to develop diseases when the temperature is 15 20 and the relative humidity is 75%.

Generally, the earlier the sowing date, the more serious the disease, the greater the damage, especially the seedlings before 7 leaves of the soil and temperature are high, drought is the most susceptible;Adjacent plots of cruciferous vegetables, viral diseases can be transmitted to each other, and can also lead to severe morbidity;In addition, there were significant differences in the resistance of different Chinese cabbage varieties to viral diseases.

Prevention and control methods. (1) the first choice of disease-resistant varieties: Chinese cabbage virus disease once infected is difficult to completely **, so the selection of disease-resistant varieties is the most effective, simplest, the best way to prevent viral diseases, there are a large number of disease-resistant varieties in production, according to different planting seasons, different plant methods and different regions, choose suitable disease-resistant varieties.

2) timely prevention and control of poisonous insects: aphids, whiteflies and other stinging and sucking pests, is the most important poisonous insects on cabbage, in the Chinese cabbage seedling stage must pay attention to the prevention and control, can be used in Chinese cabbage seedlings and planting, with 2% thiamethoxam granules respectively to the seedbed and planting holes to prevent pests from harming seedlings and spreading viruses, cut off the transmission route.

3) Spraying prevention and control: virus diseases should be mainly prevented, which can be sprayed evenly with 75 100 grams of 6% oligosaccharide and catenin wettable powder at the seedling stage, cluster stage and rosette stage, or 80 120 ml of 1% lentinan polysaccharide water solution with 1% lentinus mushroom, mixed with 30 kg of water, which can effectively prevent the occurrence of viral diseases.

To plant Chinese cabbage in summer, we must first prevent viral diseases and root bud disease, the second is to prevent soft rot, and the third is to prevent downy mildew and root rot, which can make Chinese cabbage rot, insects, die, and seedlings stunted, seriously affecting the quality of Chinese cabbage.

Chinese cabbage virus disease includes solitary disease, downy mildew and soft rot, which is one of the three major diseases of Chinese cabbage, which will cause about 10% yield loss of Chinese cabbage and seriously affect the yield and quality of Chinese cabbage.

Chinese cabbage virus disease, also known as solitary disease and convulsive disease, is one of the most common diseases in Chinese cabbage production, the most serious and the most difficult to control. Together with downy mildew and soft rot, it is known as the three major diseases of Chinese cabbage, which can cause about 10% yield loss in general epidemic years, and can reduce yield by more than 30% in some ** years. Severe plots can even lead to no harvest, which seriously affects the yield and quality of Chinese cabbage.

In one step, spray the *** suspension drug, no external infection, no virus disease.