Vegetable virus disease has become severe every year in recent years, and new viral diseases have also emerged. Being familiar with the characteristics of viral diseases and understanding the laws of viral diseases are very necessary for prevention and control. Some of the special rules for viral diseases are summarized here for reference by farmers. The virus is a parasite. Often coexist with the living body of vegetables, it can only live in the living plant life parasitic, and copy itself, can not absorb the use of dead material, the host plant death, decomposition, the virus will also passivation or death. Therefore, the vast majority of vegetable virus diseases are not transmitted by residual body, so virus sheds have already occurred. When they grow vegetables, they do not have to worry that the virus disease will spread to the next vegetable through debris and soil. Viruses are tiny nucleic acids that are invisible to the naked eye and can be crystalline and soluble in water. Dilution reaches a certain concentration, it will lose the ability to infect, called the dilution endpoint. Therefore, antivirus is spread by hand and washing hands with running water is one way. Soaking in warm water is also likely to make the virus lose its ability to become pathogenic. The possibility of viruses in vegetable seeds is extremely small, because the seed's physiological structure can play a shielding role. Even if the mother strain is infected with virus, its seeds are not toxic, so that the seedlings will not be infected by the virus on the seed. . If there is a virus, there are other reasons. If you suspect that the belt is poisoned, disinfect it with 10% trisodium phosphate. The time that various viruses keep their toxicity in vitro is not the same, and most of them will soon lose their ability to infect pathogens. This period of time is known as in vitro drug protection period. So the vast majority of viruses quickly lose their toxicity outside the plant, ie they can no longer infect and cause disease. Grafting infections are common to viral diseases. Grafting is a fusion of the cells of a vegetable, and the virus does not escape from the living host, so the grafting infection is without exception. When farmers cultivate grafted seedlings, they must avoid taking scions from their mother strains, and they must also eliminate virus-carrying rootstocks. The spread of pests is a feature of most vegetable viruses. One is the pests that suck the mouthparts; the other is that the pests have a strong specialization, that is, a virus is often transmitted by an insect, and viruses transmitted by two or more insects are rare. For example, tomato TY virus can only be transmitted by B. tabaci. Poisoning pests have a close relationship with the transmitted viruses, many of which can survive and replicate in insects. Some virus-infected pests once used the sap of virus plants, and they are poisonous for a long time, some will be poisoned for life, and others will transmit the virus to the next generation. The virus can be passivated. This is also the reason why the majority of virus in vitro protection period is shorter. Soaps and washing powders with small surface tension can make most viruses passivated and lose their ability to infect vegetables. Therefore, when grafting seedlings, picking up the shade, handling seeds, and applying vines, they should wash their hands with soap several times. Reduce the possibility of artificial transmission of the virus. The virus reproduces itself in the vegetable body by means of replication. Not to reproduce by spores, hyphae, etc. Therefore, the virus disease has no symptoms and no human eyes can see pathogens. The virus has a hidden disease. Vegetables that have been infected by the virus can show one or several symptoms, but as the conditions change, they can also make the symptoms disappear. However, the virus in the invisible state of plants still exists in large numbers, and the characteristics of transmission will not change. However, vegetable viruses are less harmful when they are in an invisible state. Plant viruses, including vegetable viruses, exist in cells and replicate. Chemical drugs that enter the cell to kill the virus and damage the cell are hard to do. Therefore, the prevention and treatment of viral drugs can be achieved, but it is almost impossible to kill them. Therefore do not listen to the propaganda that a certain drug completely kills the vegetable virus. Chemical control drugs have reached their peak in the suppression of viruses, which requires us to pay attention to the use of disease-resistant varieties and killing of tobacco whitefly instead of spraying alone in the prevention of tomato TY virus. The tiny wounds are the conditions for the virus to invade. The wound can be small enough to injure only one part of the cell without killing the cell, making it suitable for viral entry. The insect's mouth-and-needle can reach the requirement of puncturing the cell instead of dead cells, so some insects that suck the mouthparts can transmit the poison, while insects that eat large leaves can hardly transmit the poison. Usually more human wounds can not be transmitted. If using a pin is difficult to inoculate successfully, the reason is that the wound caused by the pin is too large. Types Of Baijiu,Chinese Booze,Chinese Baijiu Online,Chinese Spirit Baijiu Shan Dong Kao Shang wine industry Co.,Ltd , https://www.ksbaijiu.com