I provide pest control agent novel, the insecticides or acaricides in particular. The general formula (1): Wherein, A3 and A1, A2 represents a nitrogen atom or a carbon atom and each independently, G represents a benzene ring or the like, -CH2 L is -, - CH (CH3) -, - CH (CN) -, etc. represents, X represents a halogen atom, a haloalkyl group C1~C6, Y is a halogen atom, an alkyl group or the like C1~C6, R1 is -C (O) R1a, -C (O) OR1a, -C ( represent O) NHR1a, etc., a hydrogen atom, C1~C6 haloalkyl group, C1~C4 alkoxy (C1~C4) alkyl, cyano (C1~C6) alkyl, C3~C6 alkenyl group, R2 is an alkynyl group C3~C6 represents (O) OR15, such -C (O) R15, -C, R3 represents a haloalkyl group C1~C6, m represents an integer of 0~5, n represents an integer of 0 to 4. Its salts, and pesticides containing them or replacement isoxazoline compound represented by].新規な有害生物防除剤、特に殺虫剤又は殺ダニ剤を提供する。一般式(1):[式中、A1、A2及びA3は各々独立して炭素原子又は窒素原子を表し、Gはベンゼン環等を表し、Lは-CH2-、-CH(CH3)-、-CH(CN)-等を表し、Xはハロゲン原子、C1~C6ハロアルキル基等を表し、Yはハロゲン原子、C1~C6アルキル基等を表し、R1は-C(O)R1a、-C(O)OR1a、-C(O)NHR1a等を表し、R2は水素原子、C1~C6ハロアルキル基、C1~C4アルコキシ(C1~C4)アルキル基、シアノ(C1~C6)アルキル基、C3~C6アルケニル基、C3~C6アルキニル基、-C(O)R15、-C(O)OR15等を表し、R3はC1~C6ハロアルキル基等を表し、mは0~5の整数を表し、nは0~4の整数を表す。]で表される置換イソキサゾリン化合物又はその塩、及びそれらを含有する有害生物防除剤。
