Pyrazole derivatives, selective herbicidal compositions containing said derivatives and the use of said derivatives are provided. The pyrazole derivatives having selective herbicidal activity are represented by the formula I: ##STR1## wherein, X denotes a halogen, nitro or methanesulfonyl, Y denotes hydrogen, a lower alkyl or a halogen, Z denotes a halogen or methanesulfonyl, and R denotes hydrogen; an organic acid residue; a lower alkynyl; a lower alkyl or a lower alkenyl which may be substituted by a halogen, hydroxy, cyano or an alkoxycarbonyl; or a benzyl which may be substituted by a halogen, nitro or a lower alkyl.
提供了
吡唑衍
生物、含有该衍
生物的选择性
除草剂组合物以及使用该衍
生物的方法。具有选择性除草活性的
吡唑衍
生物由公式I表示:##STR1## 其中,X表示卤素、硝基或甲磺酰基,Y表示氢、较低的烷基或卤素,Z表示卤素或甲磺酰基,R表示氢;有机酸残基;较低的炔基;较低的烷基或较低的烯基,其可被卤素、羟基、
氰基或烷氧羰基取代;或者是苄基,其可被卤素、硝基或较低的烷基取代。