Potato black shank is a bacterial disease that mainly damages potatoes and stems of potatoes. The seed potatoes are susceptible to rot and become sticky, unable to germinate, or they just rot in the soil and cannot sprout. The seedlings were susceptible, the plants were dwarf, the internodes were shortened, the leaves were unrolled, the leaves were greenish and yellow, the crests were dark brown, and wilting died at the late stage of disease. The potato squash became dark brown when it was susceptible to disease, and the skin did not separate by squeezing the skin. The vascular bundles were also dark brown. Potato black shank disease spreads through seed potatoes and accelerates propagation through cutting tools while cutting seed potatoes, causing more potato rot. To prevent potato black shank disease, we must first choose disease-free seed potatoes for planting. When cutting seed potatoes, we must pay attention to using 800 times 50% carbendazim solution to disinfect the cutting tools. Cut good seed potatoes to use woody ash or carbendazim to coat the cuts. After planting. After planting till the seedlings had emerged from the open soil, the roots were applied twice 600 times 20% copper thimyctin solution or 800 times 1.5% aqueous solution of thimyctonate when freshly planted under cover soil and when sprouted and uncovered. . Spray 2-3 times 800-fold chlorobromoisocyanuric acid aqueous solution, or 2000 times 72% aqueous solution of streptomycin sulfate, 800 times 1.8% aqueous solution of oxamidine acetate, 1500 times 33.5% quinoline copper in the seedling stage. Aqueous solution, spray once every 10-15 days. SHANDONG JOIN & SHARE AGRICULTURAL DEVELOPMENT CO., LTD , https://www.joinsharemushroom.com