Virus disease is one of the major diseases in tomato production in resource counties. It occurs more commonly and is seriously endangered. The general incidence rate is above 30%, and the yield loss rate is above 20%. The severely affected farmland produces more than half or even no income. There are many field symptoms of tomato virus disease: mosaic type, stripe type, leaf type and so on. The occurrence of tomato virus disease is closely related to environmental conditions, and generally hot and dry weather is conducive to disease occurrence. In addition, excessive application of nitrogen fertilizer, plant tissue growth is soft or thin soil, compaction, sticky weight and poor drainage disease. Tomato virus virus species often have periodic changes in a year, with a large proportion of tobacco mosaic virus in spring and summer, and cucumber mosaic virus in autumn. Therefore, the prevention and control of production should be based on the source of the virus, and take appropriate measures to receive more satisfactory results.
First, the agricultural program: First, select resistant varieties. According to the local main source of poisons, disease-resistant varieties should be selected according to local conditions. The second is the implementation of virus-free seed cultivation. Seed soaking with fresh water for 3 to 4 hours before sowing, and then immersed in 10% trisodium phosphate solution for 40 to 50 minutes, remove and rinse with clean water before germination sowing. Planting sites must use fields that have not been planted with tomatoes or where tomato virus disease has not occurred. Deep plowing must be performed. The third is to implement rotation for change. Avoid continuous cropping for many years to reduce virus transmission from tomato virus disease soil and residues and reduce the occurrence of virus diseases. Weeds and planted sheds should be thoroughly cleared of toxic weeds and diseased plants to reduce the virus source of virus diseases; . The fourth is to cultivate and prevent disease. One is to sow appropriately, cultivate strong seedlings, and require flower buds when planting, but it does not age; the other is early planting at the right time to promote strong seedlings; and third, cultivating weeds, cultivating soil in time, promoting hair roots, and fighting lately. Harvest early. The fifth is early prevention of aphids and whiteflies. Nursery and planting sites should be treated with 10% WP as soon as possible to control weeds, as well as surrounding aphid and mites, to prevent the spread of insect vectors such as mites and whiteflies, and to effectively prevent virus infection and reduce tomatoes. The occurrence of viral disease.
Second, the prevention program (small seedling prevention): Before the onset of disease, every 100ml TY virus 1 watered 30-45 kilograms, every 3 - 5 medication 1, according to the prophylactic cycle of 7 - 8 ear fruit, medication time is about 50 days or so 10-15 bottles per acre;
Third, control + prevention (early onset): The main spray TY virus No. 1, according to 40-60 grams of water per barrel, once every 2 days, every 5 days with the next course of treatment; condition was controlled after the switch to tomato TY virus, each 100ml water 30-45 kg;
Fourth, the control program (late onset): The main application of TY virus 1, according to a bucket of water 40-60 grams, once every 2 days, every 5 days with the next course of treatment.
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