In the early spring, the tomato virus virus has been seriously affected. The main reasons are: First, the spring climate is arid and the locusts multiply, 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.
The prevention and control methods are described as follows: 1. The withdrawal time of the shelters depends on the weather. Normally, when the temperature is lower than 10°C at night, it is not suitable 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. Under the conditions of high temperature and strong light, the wind should be released around, so that the shed film can only play a role in blocking the glare and avoid burning the plants. In places with good conditions, shades can be shaded with shade nets from 10 am to 4 pm in sunny days. 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 transmission of the virus. Every 7 to 10 days, spray once-on-a-time net, diazepam, anti-indolyl, dimethoate, and diflubenzuron to kill aphids and prevent virus transmission. 4, pharmaceutical control. At the beginning of the disease, the disease was sprayed once with a solution of phytopathogenic spirit, virus A, virus quick killing, and antivirus scorpion, for a total of 2 to 3 injections. In combination with spraying, auxin, potassium dihydrogen phosphate and other solutions should also be sprayed to enhance plant disease resistance.
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