Symptoms and control of snow vegetable virus disease

Snow vegetables, alias: Shiraki, nine-head mustard, cooking, vegetables, etc., Brassica, angiosperm, is a kind of mustard. Snow cabbage is the tender stem and leaf of cruciferous mustard, which tastes cool and belongs to the lung, spleen and stomach meridians. It has the effect of diuresis and relieving diarrhea, dispelling wind and dispersing blood, reducing swelling and relieving pain. It is a common folk herbal medicine for the treatment of adverse urination, dysentery, hemoptysis, swollen gums, hoarse throat, swelling and pain of hemorrhoids, itching of lacquer sores, injury caused by falls, joint pain and so on.

Snow vegetables can be planted many times a year. Snow vegetables sown in winter in Jiangsu and Zhejiang are called spring vegetables, and snow vegetables sown in autumn are called winter vegetables. In Hunan, Hubei and Sichuan, snow vegetables are cultivated in four seasons, which are locally called "four seasons snow vegetables" (dishes).

Growth habits of snow vegetable

The environment of the production site includes atmosphere, soil, irrigation water, etc., and the selection should meet the national standards, requiring loose and fertile soil, high organic matter content, convenient drainage and irrigation. Cruciferous vegetables have not been planted in recent 2-3 years, and PH is neutral or slightly acidic.

The medicinal value of snow vegetable

Xuelihu has the effects of detoxification and detumescence, appetizer and digestion, warming and promoting qi, mainly for the treatment of sore carbuncle, tightness of chest septum, cough and sputum, deafness of eyes and ears, swollen gums, constipation and other diseases. Sexual taste meridian: sexual temperature, taste sweet pungent; human liver, stomach, kidney meridian. Efficacy indications: detoxification and detumescence, appetizer and digestion, warming and benefiting qi. Discerning eyes and clear eyes. It mainly treats sore carbuncle, stuffy chest septum, cough and sputum, deafness of eyes and ears, swollen gums, constipation and other diseases.

Nutritional value of snow vegetable

1) awaken the brain and refresh oneself. Potherb contains a large amount of ascorbic acid, which is a highly active reducing substance, which participates in the important redox process of the body. It can increase the content of oxygen in the brain, stimulate the use of oxygen in the brain, wake up the brain and relieve fatigue.

2) detoxification and detumescence. Potherb has the function of detoxification, can resist infection and prevent the occurrence of diseases, inhibit the toxicity of bacterial toxins, promote wound healing, and can be used to assist in the treatment of infectious diseases.

3) appetizer and digestion. Pickled potherb has a special flavor and fragrance, which can promote stomach and intestinal digestion, increase appetite, and can be used as an appetizer to help digestion.

4) clear eyes and diaphragm, wide intestines and defecation. Potherb tissue is thick and hard, containing carotene and a large amount of edible cellulose, so it has the effect of clear eyes and wide intestines, which can be used as a good food for ophthalmic patients, as well as the prevention and treatment of constipation, especially for the elderly and people with habitual constipation.

Symptoms and control of snow vegetable virus disease

What is a viral disease?

Virus disease is a disease caused by plant virus parasitism. Plant viruses must live parasitically in host cells with strong specificity, and a certain virus can only infect one or some plants. But a few do widespread harm, such as tobacco mosaic virus and cucumber mosaic virus. In general, plant viruses are active only in host plants; only a few plant viruses can remain active in diseased plant residues for days, months, or even years, and a few plant viruses can survive or multiply in insects. Plant viruses replicate nucleic acid (RNA or DNA) and protein coats in host cells to form new virions. The transfer rate of plant virus particles or viral nucleic acids between plant cells is very slow, while in the vascular bundle, it can be transferred rapidly with the direction of plant nutrient flow, causing disease all over the plant.

Symptom recognition of snow vegetable virus disease

The symptoms are often complicated by multiple virus infections in the field. It can be divided into the following four types:

The main results are as follows: 1. Mosaic type: the typical symptoms are irregular chlorosis, dark green and light green mottling of diseased leaves and fruits, and there is no obvious abnormality in plant growth, but in severe cases, except mottled, diseased leaves and diseased fruits are deformed and wrinkled, leaf veins are bright, plants grow slowly or dwarf, and bear small fruits, the fruit is difficult to turn red or only partially turn red, ossified.

2. Yellowing type: the diseased leaves turn yellow, and in severe cases, the upper leaves of the plant all turn yellow, forming upper yellow and lower green, and the plant is dwarfed with obvious deciduous leaves.

3. Necrotic type: including top withering, mottled ring death and striped necrosis. The young part of the top withered finger plant branch turns brown and necrotic, while the rest of the symptoms are not obvious; mottled necrosis can occur on leaves and fruits, and the disease spot is reddish brown or dark brown, irregular, and sometimes perforated or developed into a large yellow brown spot. there is a dark green ring around the spot, and the leaves turn yellow and fall off quickly. Stripe necrosis is mainly manifested in the branches, the disease spot is reddish brown, spread up and down along the branches, falling leaves, flowers and fruits, and the whole plant withered in severe cases.

4. Deformity: the diseased leaves are thickened, smaller or in the shape of fern leaves, and the leaves are wrinkled. The internodes of the plants were shortened and dwarfed, and the branches and leaves were clustered. The diseased fruit shows dark green and light green flower spots, or yellow and green flower spots, the diseased fruit is deformed, and the fruit surface is convex and uneven. The diseased fruit falls off easily.

Prevention and treatment of snow vegetable virus disease:

1 Agricultural control: disease-resistant varieties were selected for ①. ② should strengthen cultivation management, reasonable crop rotation, remove diseased and residual plants after harvest, and pay attention to the disinfection of hands and tools in field operation. ③ seeds are disinfected, soaked in water for 4 hours, removed and soaked in 10% trisodium phosphate solution for 20 minutes, then washed and germinated and sowed.

(2) A new type of virus disease inducer dextran or aminooligosaccharide can also be used for prevention and treatment.

The prevention of viral diseases should be based on comprehensive prevention. The drugs for the prevention and treatment of virus diseases on the market are Zhanling, 32% nucleoside bromo morpholine guanidine (new formula), Kangwei (virus K), virus Rick, virus A, virus B, virus star, and so on. Under normal circumstances, if the virus disease is not serious, any of the above chemicals can be used for three times, but if the disease is serious and the environmental conditions are not conducive to the growth of vegetables, it is not ideal to rely on any of the above chemicals alone.

Chemical control: the diseased plant and the fruit trees around the diseased plant were diluted with "virus Ⅱ" (or "virus No. 1" 15kg every 40 grams of water, appropriate reduction before and after flowering) in about 5 days of budding, the red period of flower dew, 7 days after Xie Hua, after the Summer Solstice and before and 4 periods of the Autumn Equinox. At the same time, pure milk 0.5Kg was added to each bucket of water to effectively prevent and control fruit tree virus disease. Note: seriously ill fruit trees should be irrigated with "virus Ⅱ" 30-50ml or "virus Ⅰ" 40 grams of 15Kg mixed with water during the budding period, mainly in the hairy fine root area, with about 50-60 jin of water per plant.