PROBLEM TO BE SOLVED: To provide a novel technology for efficiently controlling pests difficult to control or impossible to control with conventional technologies.SOLUTION: There is provided a pest control agent composition by combining an imidazopyridazine derivative represented by the general formula (I) (where A1, A2 and A3 represent a CH group or a N group, R1 represents an alkyl group or the like, R2 represents a haloalkyl group, R3 represents a hydrogen atom or the like, R4 represents a haloalkyl group or the like, R5 represents an alkyl group or the like, and m is 0 or 2) or salts thereof and one or more compound selected from a group (B). The (B) group is pyrifluquinazon, tiadinil or the like.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】従来技術では防除困難な又は防除不可能な有害生物を効率的に防除するための新たな技術を提供すること。【解決手段】 一般式(I) 【化1】{式中、A1、A2、A3は、CH基又はN基を示し、R1はアルキル基等を示し、R2はハロアルキル基等を示し、R3は、水素原子等を示し、R4はハロアルキル基等を示し、R5はアルキル基等を示し、mは、0又は2を示す。}で表されるイミダゾピリダジン誘導体又はその塩類と群(B)とから選択される1種以上の化合物を組み合わせる有害生物防除剤組成物。群(B)は、ピリフルキナゾン、チアジニルなど。【選択図】なし
