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Tomatoes in early spring are antivirus
In early spring, tomato crops are often severely affected by viral infections. The main causes include the dry and arid climate, which creates favorable conditions for locusts to thrive. These pests carry the virus from overwintering plants to tomato fields. Another key factor is the sudden exposure of young plants to high temperatures, strong sunlight, and drought after being moved from protected environments to open fields. This transition can stress the plants, making them more susceptible to disease.
To manage the issue effectively, several control measures should be implemented. First, the timing of removing greenhouses depends on the weather. When nighttime temperatures drop below 10°C, it's best to keep the greenhouse closed. During this period, increasing ventilation helps extend the release time gradually. On sunny mornings, when the temperature inside the greenhouse reaches around 28°C, it’s time to start ventilating. Once the plants enter the fruiting stage, night temperatures inside the greenhouse should be kept around 13°C. In hot and sunny conditions, it's important to ventilate during the day so that only the shade net covers the plants, preventing sunburn. In areas with good conditions, using shade nets from 10 a.m. to 4 p.m. can further protect the plants.
Second, it's crucial to remove weeds and crop residues around the growing area to minimize the spread of disease. Third, interrupting the virus transmission pathway is essential. Every 7 to 10 days, apply insecticides such as neem oil, diazinon, imidacloprid, dimethoate, and diflubenzuron to kill aphids and prevent them from spreading the virus.
Lastly, chemical treatments should be used at the early stages of infection. A solution containing phytopathogenic spirit, virus A, virus quick killer, or antivirus scorpion can be sprayed once, with 2–3 applications in total. Alongside these sprays, solutions like auxin and potassium dihydrogen phosphate should also be applied to boost the plants’ resistance to disease. By combining these methods, farmers can significantly reduce the impact of viral infections and improve the health and yield of their tomato crops.