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Tomato virus prevention
(1) The disease-free fruit is preserved in the healthy plants. (2) Seed disinfection. Soak the seed in fresh water for 3-4 hours, dip the seeds in 10% disodium phosphate solution for 30 minutes, remove and rinse with clean water, and continuously dry seeds for 3-4 days. (3) Remove the diseased leaves in time after onset, cut the diseased branches, and bring them out of the field to burn them. (4) Strengthen field management. Drain deep trenches around the plots and increase organic fertilizers to enhance the disease resistance of the plants. (5) Chemical control. In the early stage of disease, it can be treated with 1.5% Phytophage Emulsion 800-1000 times solution or 20% Virus A WP 500 times solution or 0.15% Brassinolide 7500 times solution, once every 5-7 days, once every 3-4 times . At the same time, it is necessary to focus on the prevention and control of aphids, because aphids are the main vectors of viral diseases. The plants can be sprayed with 10% imidacloprid or 1.8% edestin emulsifiable concentrate 2000 times to control aphids.