目前已有一些防治稻瘟病的有效药剂,但是如何合理有效地使用,以达到施药最少、防效最好、效益最大、污染最轻的目的,仍是一个值得探讨的问题。过去,在一些测报方法和教科书中,都认为叶瘟初见发病中心即应施药,这种提法是否恰当,一直没有人提出过异议。并且,对防治叶瘟与防治穗? At present, there are some effective medicaments for preventing and controlling rice blast, but how to use it reasonably and effectively so as to achieve the purpose of least pesticide application, best control effect, maximum benefit and least pollution is still worth discussing. In the past, in some survey methods and textbooks, no one has ever raised any objection to the propriety of the idea that leaf fever should be applied at the very beginning. And, prevention and control of leaf blast and spike?