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 causes of the disease: First, the spring climate is dry and a large number of locusts occur, spreading the virus on some overwintering plants to the 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. So, how to prevent early spring tomato virus disease? I will tell you the specific method below: First, we must master the withdrawal time according to the weather changes. Do not remove the shed when the night temperature is lower than 10°C. Instead, increase the amount of air release and extend the air 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. In addition, in the conditions of high temperature and strong light, it is necessary to let the wind out around, so that the shed film can only play a role in blocking the glare and avoid burning the plants. If there is a condition, it can be used in sunny days from 10:00 am to 4:00 pm. Shade. The second is to remove the remains of weeds and other crop residues around the place of production in a timely manner to reduce the source of the disease. The third is to cut off the spread of the virus. Every 7 days - 10 days, spray once a net, Qi Qi Su, Kang Wei Wei, dimethoate, destroy the Lee liquid and other drugs to kill aphids to prevent the spread of the virus. The fourth is to take chemical control. At the beginning of the disease, the disease was sprayed with a solution of phytophthora, virus a virus, antivirus, and sprayed once every 10 days for a total of 2-3 injections. In combination with spraying, some auxin, potassium dihydrogen phosphate and other solutions should also be sprayed to enhance plant resistance.
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