Salts thereof, and, the present invention provides a herbicide which comprises it have excellent herbicidal activity, show a high safety for useful crops and the like, or even 2-pyridone derivatives. The present invention, the following general formula [I] {wherein, X 1 represents an oxygen atom or a sulfur atom, X 4 and 2, X 3 X represents (O) m N or CH, m is 0 or 1 represents an integer, R 1 represents a C 1 ~C 12 alkyl group or a hydrogen atom, R 2 represents a cyano group or a halogen atom, n is an integer of 0~4, R 3 is a hydroxyl group or a halogen represents an atom or the like, represents the (R 11 R 12) C to A 1, A 2 represents a C = O C, or (R 13 R 14), represents the (R 15 R 16) C, A 3 is R 11 , independently of one another, R 16 and 14, R 15 R 12, R 13, R represents be C 1 ~C 6 alkyl group or a hydrogen atom. Acceptable salt thereof or a pesticidally-pyridone derivative represented by}, on herbicides, which comprises these compounds.本発明は、優れた除草活性を有し、更に有用作物等に対して高い安全性を示す2-ピリドン誘導体又はその塩、及び、それを含有してなる除草剤を提供する。本発明は、下記一般式[I]{式中、X1は酸素原子又は硫黄原子を表し、X2、X3及びX4はCH又はN(O)mを表し、mは0又は1の整数を表し、R1は水素原子又はC1~C12アルキル基等を表し、R2はハロゲン原子又はシアノ基等を表し、nは0~4の整数を表し、R3はヒドロキシル基又ハロゲン原子等を表し、A1はC(R11R12)を表し、A2はC(R13R14)又はC=Oを表し、A3はC(R15R16)を表し、R11、R12、R13、R14、R15及びR16は互いに独立して、水素原子又はC1~C6アルキル基を表しす。}で表される2-ピリドン誘導体又はその農薬上許容される塩、これらの化合物を含有してなる除草剤に関する。
