The preventive treatments are carried out by spraying the olive grove with poisoned protein baits. The adults, being glycogenic, are attracted by nitrogenous substances necessary to supplement their low protein diet. The substances used as bait for the flies are protein hydrolysates and are poisoned with organophosphate insecticides (usually dimethoate). The treatment should be carried out by spraying only part of the canopy of the trees, preferably the highest point nearest the sun. The intervention threshold for adulticide treatments are quite low (two or three adults per trap per week). Recently, the introduction of ready-made protein baits containing Dow Agrosciences Spinosad®biological insecticide also are authorized in organic farming.