What good medicine is used to prevent tomato virus disease?

Before the onset of virus disease, chemical agents can also be used to prevent it, but in general, it is mainly to improve the disease resistance of tomatoes, and prevention should be strengthened in the early stage of the disease. The following formulations of chemicals or plant growth regulators can be used for prevention and control: preventive drugs are used after planting and before budding, and toxic phosphorus is sprayed evenly every 65438- 10- 100 times. If the dose of diseased plants is found to be doubled. 3% triazole nucleoside aqueous solution 5+0.0 1% brassinolide internal emulsion 2000-4000 times; 2% ningnanmycin aqueous solution 200-400 times; 200-300 times of 4% mitomycin aqueous solution; 20% moroxydine hydrochloride copper acetate wettable powder 500-700 times; 2. 500-700 times solution of1%copper alkoxide wettable powder; 25% copper succinate and moroxydine wettable powder 600-800 times; 600-800 times of 3.85% triazole copper-zinc emulsion in water; 1.5% aqueous emulsion of copper thiosulfate alkyl alkanol 1000 times solution; 500-800 times of aqueous solution of 3.95% triazole nucleoside, copper, alkanol and zinc; 25% moroxydine zinc sulfate soluble powder 500-700 times solution; 1.05% copper sulfate solution of nitrogen glycoside 300-500 times; 20% morpholine hydrochloride wettable powder 400-600 times; 600-800 times of 3% triazole nucleoside aqueous solution; 50% chlorobromoisocyanuric acid soluble powder 800 times solution; 18% moroxydine humic acid wettable powder 600 times solution; Spray water evenly, starting from the seedlings, every 5-7 days 1 time. In addition, topdressing 1% calcium superphosphate and 1% potassium nitrate outside roots can improve disease resistance. Insecticides can also be added to control the infection of aphids and whiteflies.