Virus 2 or virus 1 can be used to control apple mosaic. Use 300-450 times of virus No.2 (or 1 virus, every 40g15kg of water, which can be appropriately reduced before and after flowering) to dilute the diseased plants and fruit trees around the diseased plants in four stages, that is, the germination period is about 5 days, 7- 10 days after flowering, and summer solstice autumnal equinox.