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What medicine should be used to prevent and treat potato blackneck and root rot?

Potato black shank, also known as blackleg, is a bacterial disease. Streptomycin, kasugamycin, Chunlei King Copper, Thiobacterium, Chlorobromide, and Zhongshengmycin can be used. , thiazole zinc and other agents are alternately used for spray control. For root rot, you can use copper ammonia, chlorobromoisocyanuric acid, metaloxamycin, fludioxonil or Bacillus subtilis plus rooting agent to irrigate the roots, and spray potassium dihydrogen phosphate plus brassinoids on the leaves to condition.