使用化学药剂防治作物病害虽然是有它的困难和缺点,但对于寄生性的真菌和细菌的有效防治,仍然是积极有效的措施,而且也是目前唯一的办法和途径。目前我国在农业上常用的杀菌药剂,仍然以铜汞的化合物为主要药剂,其它如可湿性硫磺和福尔马林等,也多被采用。但是福尔马林尚不能大规模自制,砷素剂杀菌效果不大,用大量铜汞作药剂原料有一定困难。因此利用能够保证充分供应原料的化合物或者 The use of chemical agents to prevent and control crop diseases has its own difficulties and shortcomings. However, effective control of parasitic fungi and bacteria remains a positive and effective measure, and it is the only way and approach for the present. At present, the most commonly used bactericidal agents in agriculture in our country are still mostly copper-mercury compounds as the main agent, and others such as wettable sulfur and formalin are also used more. However, formalin can not yet be self-made in large scale, and the arsenic-based bactericide has little effect. It is difficult to use a large amount of copper-mercury as a medicament raw material. Therefore, the use of a compound capable of ensuring adequate supply of raw materials or