Chemical control of scab can be achieved by soaking seeds in 0.2% formalin solution for 2 hours before sowing, or by adding water to hydroquinone 100g 100L to prepare a 0. 1% solution, soaking seeds for 30 minutes before sowing, and then taking them out to dry for sowing. At the initial stage of the disease, 65% mancozeb wettable powder 1000 times, or 72% agricultural streptomycin 2000 times, or neophytomycin (1000 million units) 5000 times, or DT wettable powder1000 times, or

After the autumn harvest, spread out the tubers, remove the diseased and rotten potatoes, spray 72% agricultural streptomycin sulfate 2 000 times solution and 50% carbendazim wettable powder 800 times solution, dry them and put them into the cellar to prevent rot; Accelerating the germination of dry seeds in spring and eliminating rotten potatoes can effectively reduce the occurrence of diseases.