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Tomatoes in early spring are antivirus
In early spring, tomato crops have been severely affected by viral infections. The primary causes include the dry and arid climate, which promotes locust activity, leading to the spread of viruses from overwintering plants to tomatoes. Additionally, the combination of high temperatures, intense sunlight, and drought creates stressful conditions for plants that have just been moved from greenhouse environments to open fields, making them more vulnerable.
To manage the situation effectively, several control measures should be taken. First, the timing of removing greenhouses depends on weather conditions. Normally, when nighttime temperatures drop below 10°C, it's not advisable to remove the coverings. At this time, ventilation should be increased to extend the period of protection. 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, nighttime temperatures inside the greenhouse should be kept around 13°C. During periods of high heat and strong light, proper ventilation should be maintained, ensuring that the plastic film only covers the areas where direct sunlight could harm the plants. In regions with favorable conditions, using shade nets from 10 a.m. to 4 p.m. on sunny days can help reduce heat stress.
Second, it's essential to promptly remove weeds and crop residues around the growing area to minimize disease sources. Third, interrupting the virus transmission pathway is crucial. Every 7 to 10 days, apply insecticides such as neem oil, diazinon, imidacloprid, dimethoate, and diflubenzuron to control aphids and prevent virus spread. Fourth, chemical treatments are necessary at the onset of symptoms. Spray a mixture containing phytopathogenic spirit, virus A, virus quick killer, and antivirus scorpion, applying it 2 to 3 times. Alongside these sprays, solutions like auxin and potassium dihydrogen phosphate should also be used to strengthen the plants' resistance to diseases.
By combining these strategies, farmers can significantly reduce the impact of viral infections on their tomato crops and ensure healthier growth throughout the season.