The production of agricultural and horticultural crops, etc. is still seriously damaged by insect pests and the like and there are causative factors such as the appearance of insect pests resistant to the conventional chemicals. Under these circumstances, the present invention addresses the problem of developing and providing a novel agricultural and horticultural insecticide. The present invention provides: an agricultural and horticultural insecticide which comprises as an active ingredient a quinoline compound having an oxime group represented by general formula (1) [wherein: R1 represents a haloalkyl group； R2 represents a hydrogen atom or an alkyl group； R3 represents a haloalkyl group or an alkylthioalkyl group； A represents an N-methyl group； A1 represents a nitrogen atom； A2 represents CH； m is 2； and n is 1] or a salt thereof； and a method for the use thereof.
