Early spring tomatoes to prevent virus disease

In recent years, the occurrence of tomato virus disease in early spring has resulted in a decline in the yield and quality of tomato, which has brought greater economic losses to producers. There are two main reasons for this: First, the spring climate is arid and a large number of locusts occur, spreading viruses on some overwintering plants to tomatoes. The second is that high-temperature light and drought make it difficult to adapt plants that have just been transferred from protected land to field. The prevention and treatment of tomato virus disease in early spring is described below for reference. 1. The withdrawal time will depend on the weather. First, when the night temperature is lower than 10°C, it is not appropriate to withdraw the shed. At this time, the amount of ventilation should be increased to prolong the release time. In the sunny morning, when the temperature of the shed reaches around 28°C, it begins to let off, and in the afternoon, it tries to put out the air outlet as late as possible. After entering the result period, the night temperature in the shed should be controlled at about 13°C. The second is under the conditions of high temperature and strong light, should be released around the wind, so that the shelter film only play a role in blocking the glare, to avoid burning the plant, where conditions can be shaded in sunny days from 10 am to 4 pm . 2. Remove the weeds and other crop residues around the production site in time to reduce the source of the disease. 3. Cut off the virus transmission route. Every 7 to 10 days, spray once-daily net, Qigensu, Kangweiwei, dimethoate, and chlorhexidine, etc., to kill aphids and prevent virus transmission. 4. Chemical control. At the beginning of the disease, the disease was sprayed with a solution of phytophthora infestation, virus a, virus rapid killing, and antivirus scorpion spray. The spray was sprayed every 10 days and sprayed for 2 to 3 times. In combination with spraying, auxin, potassium dihydrogen phosphate and other solutions should also be sprayed to enhance plant resistance.

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