METHOD enhancement of the efficacy of enhanced pesticidal compositions and pesticidal active ingredient potency

The present invention provides a compound of formula (I) [Formula 1] Or, the formula (II) ## STR2 ## (Wherein, EO represents an ethyleneoxy group, PO represents a propyleneoxy group, R represents a 8 to 20 carbon atoms, an alkyl group or an alkenyl group, w is on average an integer in the 1 to 25 expressed, tables in x represents on average any integer in the 1 to 25, y represents on average any integer in the 1 to 25, z represents on average an integer in the range 1 to 25.) It provides an agrochemical composition characterized by containing a compound and pesticidal active ingredient. Also provides a potentiation process of the pesticidal active ingredient, characterized in that in combination the compound of formula (I) or Formula (II) and the pesticidal active ingredient.