Early spring tomatoes to prevent virus disease

The withdrawal time will depend 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.
Weeding removes weeds and other crop residues around the production site in time to reduce the source of the disease.
Cut off the virus transmission route every 7 to 10 days and spray once a net, Qi Qi Su, Kang Wei Wei, dimethoate, eliminate Sai Lee and other drugs to kill aphids to prevent the spread of the virus.
In the early stage of disease prevention and treatment, the plants are sprayed with 2 to 3 times with a solution of phytophthora infestation, virus A, virus quick killing, and antivirus scorpion. In combination with spraying, auxin, potassium dihydrogen phosphate and other solutions should also be sprayed to enhance plant disease resistance.

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