Tomato virus disease is one of the most important diseases in tomato production. Therefore, the incidence of spring tomato disease is reduced by about 30% each year, and the loss of tomatoes in summer and autumn is even more serious. symptom: Tomato virus disease has a wide variety of symptoms in the field. Two or more different types of symptoms sometimes appear simultaneously on the same plant; complex infections of two or more different viruses are also quite common. Common types of symptoms are: mosaic, streak and fern leaf. Among them, striae has the greatest impact on yield, followed by fern leaf disease. Mosaic type: is the most common type of symptoms that can occur at both the seedling and adult stages. There are two common types of symptoms in the field: one is a light mosaic, the leaves are flat, normal in size, and the plants are not dwarfed. Only dark green and light green mottled leaves appear on the tenderer leaves, causing the leaves to assume a mosaic shape. , has little effect on the yield; the other is heavy mosaic, leaves are uneven, uneven, distorted deformity, leaves become smaller, the symptoms of the leaves on the tender leaves, plant dwarf, small fruits and fruit, mostly painted face It has a big impact on production. Stripe type: Infests stems, leaves and fruits. Leaf blade onset, with or without dark green or light-green mosaic symptoms on the upper leaves; stem culprit, short streaks of dark green subsidence in the upper and middle stems, and oily macular necrotic spots after dark brown subsidence. Gradually spread and spread; fruit disease, fruit surface spread irregularly brown subsidence of the oil immersed necrotic spots, deformed fruit. Fern leaf type: Symptoms often occur in the upper part of the plant. The upper part of the new leaf is linear and slender, and the growth is slow. The mesophyll tissue is severely degraded or even completely degraded, leaving only the main vein; the diseased plants are generally dwarfed, and the middle and lower leaves are upward. Roll up. Prevention: Adopt comprehensive prevention and control strategies based on agricultural control to create conditions conducive to robust plant growth. 1. The selection of disease-resistant varieties is the fundamental measure for preventing and controlling tomato virus disease. Disease-resistant varieties are: strong Feng, Lichun, Jia Hong, Zaofeng and so on. 2. Seed treatment soaked with 10% trisodium phosphate solution for 20-30min, then rinsed with clean water, germination sowing, can remove the TMV attached to the seed surface. 3. To strengthen the cultivation and management of timely sowing, nurturing strong seedlings. The management of nursery stage is strengthened, and the plant can be used for irrigation at 7-10 days before planting. After planting, appropriate seedlings were used to promote root development; full base fertilizer was applied, and phosphorus and potassium fertilizers were applied. Topdressing was performed outside the roots to increase plant disease resistance. 4. Early avoidance of high temperature and drought years should pay attention to flood control work, at the same time, we must promptly clear the fields, weeds on the ground, neighboring for vegetables should also be promptly sprayed. 5. In the early stage of the disease prevention and control, spray 20% virus spirit, 1.5% plant disease spirit, 20% virus A, anti-toxic agent No. 1 and so on. Spray once every 10 days, and spray 3 times continuously. Plant Extracts(supplement) Natural weight loss Xi'an complex bio-tech CO.,LTD. , https://www.complexpowder.com