What are the causes of tobacco leaf vein disease? How tobacco mosaic disease is formed

Cause analysis. 1. The relationship between viral diseases and varieties.

Judging from the survey, in the past two years, the city has taken Yunyan 87 as the main cultivar, with the planting of Zhongyan 100 and Zhongyan 101. Yunyan 87 and Zhongyan 100 varieties are all susceptible to tobacco virus diseases, and field diseases will occur significantly if the climatic conditions change slightly.

2. The relationship between viral diseases and climatic factors.

In terms of climate, it is mainly affected by temperature changes and rainfall during the field period. In 2005, from seedling raising to transplanting are under low temperature and low sunshine conditions, coupled with more rain, tobacco seedlings are delayed, poor field growth conditions, tobacco plant development is stunted, 60% of the city's tobacco fields began to develop after a heavy rain in mid-June; At the end of May 2006, the temperature was low, the rain was more, the soil moisture was large, the root system of tobacco plants was poorly developed, the tobacco seedlings were delayed, the occurrence of virus disease in the city's tobacco fields was significantly aggravated, after a heavy rain in early June, 30% of the city's tobacco fields began to show a general trend, which showed that the temperature change and rainfall had a great impact on the occurrence of virus diseases. The maturity period is cloudy and rainy, and the high temperature and humidity in the field are conducive to the infection of pathogens, which creates conditions for the occurrence of horn spots, and horn spot disease generally occurs in late June.

It should be said that no matter what stage of field growth, if there is a sudden heavy rainfall, diseases will occur to varying degrees.

3. The relationship between viral diseases and crude fertilizer.

In the survey, it was found that most of the plots with serious tobacco virus disease were tobacco fields that had not been applied coarse fertilizer for many years, and the disease of tobacco fields with sufficient amount of coarse fertilizer was obviously mild. Years of predatory planting in tobacco fields have destroyed the aggregate structure of the soil, reduced the organic matter, destroyed the suitable nutrient environment for the growth of tobacco plants, weakened the soil water storage and moisture retention ability, and reduced the resistance of tobacco plants.

4. The relationship between viral diseases and crop rotation and stubble.

According to the survey, the old tobacco fields that have been cropped for more than five years have not been in place due to the long time of tobacco planting, and the reasonable rotation and stubble adjustment are not in place, resulting in the accumulation of soil pathogens, the rate of diseased plants is high, and the incidence of virus diseases reaches 10% on average, and the incidence of severe disease reaches 15%. In the newly developed tobacco fields, the virus disease is mild, and the incidence of virus disease is only 2%-3%. The incidence rate of horn spot in the old tobacco field was 76%, while the incidence rate of horn spot in the first year of tobacco planting was only 18%.

Continuous cropping tobacco fields, especially the removal of diseased leaves and discarding, topping and wiping branches, and the cleaning of diseased plants and residual leaves, are serious, resulting in an increase in the number of soil pathogens, which will lead to the occurrence of tobacco field diseases when the external climate conditions are suitable. The fundamental reason why the occurrence of tobacco disease can be controlled by crop rotation is to avoid the re-infection of tobacco pathogens in the soil of the previous year.

5. The relationship between viral diseases and tobacco aphids.

The survey showed that the occurrence of viral diseases was closely related to the number and activity of aphids in the field. When the climatic conditions are suitable, the aphids migrate to the tobacco fields in large quantities, and the disease is more serious. The opposite is light. In addition, the closer the tobacco fields are to villages, orchards, and trees, the more aphids migrate and the more serious the disease.

6. The relationship between disease and management.

When cutting leaves in the seedbed, the onset of the disease that has been disinfected with soap and water with hands and scissors is light, and the onset of the disease that has not been sterilized is severe and early. Grab the wet planting of tobacco fields, tobacco plant roots.

In the early stage of the disease, the parietal vein vein is bright, and then the leaf vein necrosis appears, and then the whole thing is called yellowing and wilting, which is quite eye-catching.

One of the components contained in tobacco that is harmful to the human body is nicotine, also known as nicotine. If 50 milligrams of nicotine is injected into the body, it is enough to cause the end of a person's vital signs and death. Smoking is the most harmful to the respiratory tract and can easily cause laryngitis, tracheitis, emphysema, and may also lead to lung tumors, such as lung cancer.

Moreover, when a smoker smokes, it will cause others to inhale second-hand smoke, so that the people around him will also be harmed by cigarettes.

Summary. Dear, I'm glad to answer for you: How is tobacco mosaic disease formed:

Tobacco mosaic disease is caused by a virus. The virus is hereditary, varied, and evolutionary, and the drugs that can be used are mushroom proteoglycan (or lentinan polysaccharide) + natural brassinin + octamine acetate (or chlorbromoisocyanuric acid) + zinc sulfate + thiamethoxam (or acetamiprid) for control, spraying the foliage of tobacco every 7-10 days, and spraying 2-3 times in a row can blunt the virus and weaken the activity of the virus.

What kind of medicine is used? Dear, I'm glad to answer for you: How is tobacco mosaic disease formed:

Tobacco mosaic disease is caused by a virus. The virus is hereditary, variable, and evolutionary, and the drugs that can be used are mushroom protein polysaccharide (or lentinan polysaccharide) + natural brassinin + occultamine acetate (or chlorbromoisocyanuric acid) + zinc sulfate + thiamethoxam (or acetamiprid) for prevention and control, spraying the foliage of tobacco once every 7-10 days, and spraying 2-3 times in a row can blunt the virus and weaken the activity of the virus.

Tobacco suffering from mosaic disease can generally be prevented and treated with mushroom proteoglycan + natural brassinin + octamine acetate + zinc sulfate + thiamethoxam and other drugs, sprayed once every 7-10 days, and sprayed 2-3 times in a row can have the effect of passivating the virus and weakening the activity of the virus (or killing the virus). Yuyu search.

1. What kind of medicine should be used for tobacco mosaic diseaseTobacco mosaic disease generally refers to tobacco virus disease, which can be prevented and controlled with mushroom proteoglycan (or lentinan polysaccharide) + natural brassinin + octamine acetate (or chlorbromoisocyanuric acid) + zinc sulfate + thiamethoxam (or acetamiprid), spraying the leaves of tobacco every 7-10 days, and spraying 2-3 times in a row can blunt the virus and weaken the activity of the virus (or kill the virus).

Is brassinolide OK?

Brassin lactin can be used to promote the growth of seedling roots, but the prevention of mosaic disease is best mixed with the above agents.

Tobacco suffering from mosaic disease can generally be prevented and treated with mushroom proteoglycan + natural brassinin + occultamine acetate + zinc sulfate + thiamethoxam and other drugs, sprayed once every 7-10 days, and sprayed 2-3 times in a row can have the effect of passivating the virus and weakening the activity of the virus (or killing the virus).

1. What medicine should be used for tobacco mosaic disease?Tobacco mosaic disease generally refers to tobacco virus disease, which can be prevented and controlled by mushroom proteoglycan (or lentinan polysaccharide) + natural brassinin + octamine acetate (or chlorbromoisocyanurate) + zinc sulfate + thiamethoxam (or acetamiprid), spraying the foliar surface of tobacco every 7-10 days, and spraying 2-3 times in a row can blunt the virus and weaken the activity of the virus (or kill the virus). Other effects: After application, it can also inhibit the reproduction of the virus, in addition to killing aphids, thrips, planthoppers and other pests that spread the virus, so as to prevent the onset of disease and prevent the spread of the disease.

2. What causes tobacco mosaic diseaseTobacco mosaic disease is caused by a virus. The virus is hereditary, variable, and evolutionary, it is a life form with a small size and simple structure, and the virus has no cell structure, it is mainly composed of internal nucleic acids and external protein shells, so it cannot survive independently, and can only parasitize in living cells to carry out life activities (leaving the cell will become crystalline). Mosaic disease can be caused if the juice from tobacco with mosaic disease is dropped onto healthy tobacco leaves, and mosaic disease can still be caused if the juice from diseased tobacco is filtered (through a bacterial filter) and then dripped onto healthy tobacco leaves.