The novel cyanopyridines of the general formula (I)
 (A, B, R1, R2, X, m and n are defined in the specification) show selective herbicidal activity.
The new compounds can be prepared according to known methods and can be used as herbicides in agriculture and related fields.
                            通式 (I) 的新型
氰基
吡啶类化合物(A、B、R1、R2、X、m 和 n 在说明书中定义)具有选择性除草活性。
 (A、B、R1、R2、X、m 和 n 在说明书中定义)具有选择性除草活性。
新化合物可根据已知方法制备,并可用作农业及相关领域的
除草剂。