Vegetable virus harm has become the second largest disease after fungal diseases, causing great losses to vegetable production every year. In recent years, the area of ​​vegetables in the off-season has been expanded, coupled with seed-borne infections and suitable climatic conditions. The tomato virus disease caused by the cucumber mosaic virus has risen rapidly, causing serious damage. Therefore, the prevention and control of tomato virus disease has become the focus. The occurrence characteristics of tomato virus disease and its control techniques are briefly described as follows: Symptoms and Causes of Tomato Viral Diseases Tomato virus diseases in the field mainly include mosaic type, leaf curl type and streak type. Mosaic type: yellow and green leaves appear on the leaves with mottled lines, veins are transparent, and the leaves are slightly wrinkled. The diseased plants are slightly shorter than the plants; leaf type: yellowing between leaves and veins, and the edges of the leaves are bent upwards. Leaflets are spherical, twisted into a spiral deformity, the entire plant atrophy, sometimes clustered, early infection, and more can not be flowering results; streak type: can occur in the leaves, stems, fruit, lesion shape due to different parts of the site, On the leaves are dark brown spots or moire, on the vines dark brown patches, the discolored part is only in the surface tissue, not deep inside the stem, fruit, this type of symptoms is often caused by tobacco mosaic virus or other One or two kinds of viruses caused by complex infection, prone to occur under high temperature and strong light. Transmission routes and disease conditions Tobacco mosaic virus is overwintering on a variety of plants, and seeds are also poisonous. It becomes an initial source of infection, and is mainly transmitted through sap-contact. As long as the host has a wound, it can be immersed, and the fruit particles attached to the tomato seed are also Can be toxic, in addition to the soil in the body, the winter host residues in the field, field weeds, etc., can become the disease of the initial disease. Cucumber mosaic virus is mainly transmitted by locusts, and sap can also be transmitted. In winter, the virus overwinters on perennial weeds, and spring locusts migrate to pass poisons, causing tomato disease. Prevention and control methods To control tomato virus disease, comprehensive prevention measures based on agriculture should be adopted. we are chinese largest manufacturer of Freeze-dried Pet Treats and we have our own freeze-dried production machine.Freeze-drying works by freezing the product and then reducing water in the material to sublimate directing from the solid phase to the gas phase.Freeze-dried Pet Food retains all nutrients fould in fresh raw food..Material and preserve the aroma and full flavor,provides ultmate convenience,combine with remium nutrients to treat,train,and reward your pets. Freeze-dried Pet Food Freeze-dried Pet Food,Freeze-dried Pet Treats,Freeze-dried Pet Snacks,Freeze-dried Meat Eastan Pet , http://www.eastanpet.com
The occurrence of tomato virus disease is closely related to environmental conditions. In general, high temperature and dry weather are conducive to disease occurrence. In addition, excessive application of nitrogen fertilizer can cause tender growth of vegetable tissue, soil slimness, compaction, sticky weight and poor drainage. Tomato virus disease types often change periodically in a year, with a large proportion of tobacco mosaic virus in spring and summer and cucumber mosaic virus in autumn. Therefore, the source of poison should be aimed at prevention and control of production. Only by taking corresponding measures can we receive control effects.
(1) According to the local main sources of poisons, disease-resistant varieties should be selected according to local conditions. In recent years, the new breeds of anti-tobacco viruses in China include: Lu Tou No. 5, Jiafen No. 15, Zhongza No. 7, Maofen No. 802, Zhongshou No. 4, No. 5, No. 6 and so on.
(2) Implement virus-free seed cultivation. Soak seeds in fresh water for 3-4 hours before sowing, then soak in 10% trisodium phosphate solution for 40-50 minutes, remove and rinse with clean water, then sow germination, or soak with 0.1% potassium permanganate for 30 minutes; Planting land must be selected from plots that have not been grown or where tomato virus disease has not occurred. The fields where tomato virus disease has occurred must be deep-rooted to promote the rot of the diseased corpse, and lime should be used to promote the disability of the soil. The body of tobacco mosaic virus passivation.
(3) Carry out crop rotations to avoid intercropping and continuous cropping, reduce and avoid virus transmission of tomato virus disease soil and residues, and reduce the occurrence of viral diseases; nursery sites and planting sheds should completely eliminate toxic weeds and reduce The source of virus disease; promote the application of formula fertilization technology, spraying more than 6000 times the love, or planting treasure prime 7500 times, enhance the host disease resistance.
(4) Preventive measures for fitness cultivation: First, appropriate sowing, cultivating strong seedlings, proper seedling age, buds required for planting, but not aging; second, early planting at early stage, promoting early growth of strong seedlings, using plastic sheds Cultivation, to avoid the onset of the field; Third, weeds, grass, timely soil, promote hair roots, late snoring, early harvest; planting seedling spraying 1/10000 increase production, can increase the resistance to mosaic virus .
(5) Control of spraying at the beginning of onset; spray protection at the beginning of the disease (5-6 leaf stage), 3.85% of the virus will be applied to the WP500 times of foliar spray, and the spray will be sprayed once every 7 days. Continuous spraying 3 times, the efficacy of prevention and treatment of tomato virus disease up to 75-80%, can also be used 1.5% phytopathogenic Ling 800 times, or 20% of the virus A500 times spray, use the same method before, for virus disease The control effect can reach about 70%, less than the effect of virus control. It can also use 5% bacteriostatic water solution 400 times solution, or potassium permanganate 1000 times solution, in addition to spraying 50-100ppm and 1% over production. The use of calcium phosphate as a top dressing can increase disease resistance.
(6) Early locust mites and whiteflies: As soon as possible, imidacloprid or high-efficiency Dagongchen spraying is used to prevent and control weeds and venomous aphids and whiteflies on surrounding vegetables, and to prevent the spread of insect vectors such as aphids and whiteflies. It is necessary to pay attention to the timely control of aphids and whiteflies in the year of high temperature and drought, which can effectively prevent TMV infection and reduce the occurrence of tomato virus disease.