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为害水田的杂草种类随着农家使用除草剂种类的不同而发生变化。日本在水田上使用除草剂始于1945年。在此以前,为害水田主要以稗草和鸭舌草等一年生杂草为主。伴随着水田高效除草剂2,4—D、PCP 和 CNP 的普及,杂草种类由一年生变为多年生杂草为主。在后来除草剂开发普及的过程中,即使多年生杂草当中由牛毛草发展成为慈菇、萤蔺和水莎草,尤其是野慈菇和荸荠等水田的难防杂草。在水田杂草种类这种变迁过程中,逐渐建立起了应用初期、
The types of weeds in harvested paddy fields vary with the type of herbicide used in the farms. The use of herbicides in paddy fields in Japan dates back to 1945. Prior to this, the main damage to paddy fields mainly barnyard grass and monocots such as Monochoria. With the popularization of 2,4-D, PCP and CNP, which are efficient herbicides in paddy fields, weeds changed from annual to perennial weeds. In the subsequent development of herbicides popular, even the weeds among the perennial hair grow into a Sagittaria, Ying Lin and water sedge, especially wild arrowheads and water chestnuts and other non-control weeds. In the field of paddy weed species change process, gradually established the initial application,