Abstract: The control effects of several pesticides on population of both the leafminer Liriomyza sativae and its natural enemies were evaluated by means of the interference index of population control (IIPC) and exclusion index of population control (EIPC). The results showed that the leafminer population could be controlled effectively by abamectin, chlorpyrifos (48%) and dimehypo (18%). Their IIPC-values were estimated to be 0.124, 0.111 and 0.119, respectively. Among them the EIPC-value of abamectin was maximum which indicated that the affect of application of abamectine on the population of leaf miner's natural enemies was less significant. The results of both application evaluation in field and toxic test in laboratory indicated that the application of methomyl (24%) affected the natural enemies' population of the leaf miner.