1. Cultivating strong seedlings and improving the robustness of seedlings have already been explained in the foregoing. How to cultivate strong seedlings? The nursery bed soil must be chosen to contain loose soil or organic fertilizers rich in organic matter to ensure that the development of the root system is strong and strong. This is a successful experience. In early spring, seedlings should be given water at the same time, and no water should be burned after unearthing. Utilize mulch, cover film and insulation coverings to do everything possible to increase the temperature in the early spring. In short, the design of all the measures for seedling raising in the early spring should be based on requirements such as loose and fertile soil, warming and heat preservation, proper temperature, and adequate ventilation and light transmission. Summer seedlings can be seeded around ventilation, cooling, flood control, and flood prevention. For example, a ventilation plot, a cold yarn cover, a light shielding, an astigmatism, a flood prevention, etc. 2. To do seed treatment to focus on sterilization and detoxification, two advanced technologies can be selected. (l) The seeds will be placed under constant temperature and dry conditions at 70°C for 72 hours (this measure has been applied in Jinan, Shandong for nearly three years Mu) to passivate the virus that survives inside the seed. (2) soaking with 10% aqueous sodium phosphate solution for 20 minutes, promptly rinsing and rinsing after several times, germination. This measure can kill the living virus outside the disintegrating seed coat and remove other pathogens attached to the seed coat. The above two technologies are combined to apply high temperature and passivation, and the post-sodium phosphate aqueous solution treatment effect is better. This method can replace all other seed disinfection measures. 3. There are currently three types of substances that have been used for the control of viruses for the application of blockers. First, passivation substances, such as milk, milk, fish blood, blood stasis and other high protein substances diluted with water spray on the plants, can weaken the virus's ability to infect, reduce its sharpness, called the passivation. Generally use 100-200 times of water dilution to spray 3 to 5 times; The second is the protection of substances, such as sodium alginate (kelp), NS-83, high-fat membrane and other spray on the plant to form a thin layer Protective film to prevent and reduce the invasion of the virus. The spray is usually applied 2-4 times using 20D-500 times water dilution. The third is to increase the resistance of substances, spraying on the plants can be quickly inhaled into the body to stimulate the body's activity, resistance virus in the body of the operation and proliferation, such as AV-2 sprayed on the plant, after absorption of the plant photosynthetic products The operating speed is increased by more than 4 times, which significantly increases the resistance. The commonly used concentration is 500 times the water release solution and the spray is applied 3-5 times. 4. The use of silver-gray reflective film silver gray reflective film has a significant drive-off effect, thereby reducing the possibility of transmissible virus, the application of silver reflective film, the amount of antimony can be reduced by more than 40%. The general application method is to hang a width of 4-5cm of film strip vertically on the upper part of the rod (more than 20cm above the plant growth point), so that the aphid does not land on the plant. This method is used in combination with a yellow adhesive film (the yellow sticker film is placed around the field to trap and kill the aphids). 5. The use of a weak virus can infect tomatoes and cause significant disease and serious harm. This virus (sometimes a strong infective strain of a virus) is used by people as a strong virus. Infecting tomatoes and causing serious diseases is In strong strains of TMV, people use high-temperature or chemical methods to mutate this strong strain into a non-hazardous infection or asymptomatic or with mild symptoms. The virus that has been mutagenized and maintains stability is called Weak virus. After inoculation of the cowpox vaccine from infants, the human body has been inspired by the success of the cowpox (pox) virus for lifelong immunization. The strong strains of TMV were artificially induced into weak strains and then applied to the tomato. Good results have been obtained. The specific method is as follows. (l) Breeding of non-toxic seedlings. After the seed was treated by the method described above, germination was sown in a non-toxic environment and the seedlings within 30 days were protected by plastic or gauze. (2) Inoculation of a weak virus. For young seedlings about 30 days old, there is a sub-seedling artificial planting procedure. The seedlings of 30-day-old seedling age are picked up and subjected to a 10cm square planting, combined with seedlings to gently remove the root soil, and immediately immersed in the attenuated vaccine. In the diluted solution of fresh water, after 30-60 minutes (weak virus particles have entered the plant body from the root micro-wound as the roots absorb water), the seedlings are planted in accordance with the customary procedures, and the management of strong virus infection is continued after the prosthesis 30-40 Days (weak virus particles proliferate and distribute in plant roots, stems, and leaf tissue sites) were planted in Daejeon. (3) Matters needing attention. Strong seedlings were inoculated with attenuated vaccines and were more effective than pungent vaccines for attenuating the disease. The weak virus is weak, so it is necessary to prevent all strong viruses from infecting within 60 days and to prevent smokers from carrying out this operation. Weak virus vaccine can not replace plant nutrition, we must pay attention to strengthening management, do everything possible to cultivate strong seedlings. 6. Promote plant growth and development In the spring tomato colonization, raising the ground temperature, planting in advance, and promoting fertility are effective measures for preventing virus diseases. Applying as much plastic film as possible is an effective measure to increase the ground temperature. Immediately after planting, the mulch was placed between rows and a small arch was placed over the newly planted seedlings. Using this double membrane method, it can be planted 15-20 days earlier, and it can also promote growth and development effects for about 30 days. From the point of view of disease prevention, 40 percent of production and 60 percent of production value have already been achieved before the arrival of climate conditions suitable for the virus disease. 7. Warming and cooling in the northern and southern regions in May and June is the dry season and the temperature is between 25-30°C. With the small humidity in the soil and air, virus diseases can easily occur. In addition to paying attention to timely heating and cooling in this period, spray mist cooling can also be used with good results. The specific method is to spray a water mist on the plants from 10:00 am to 4:00 pm every day at high temperature and drought, and the onset period can be further delayed by about 10 days. In addition to the above methods, do not ignore the effect of increasing phosphorus and potassium fertilizers.

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