The present invention relates to a phthalamide derivative represented by
the general formula (I): ##STR00001## wherein R.sup.1, R.sup.2, R.sup.3,
X, Y, m, and n are as defined in the disclosure, which can be used as the
active ingredient in an agricultural or horticultural insecticide that
exhibits an excellent insecticidal effect even when used in a small
active-ingredient amount.