ABSTRACT Starfruit (Averrhoa carambola L.) is a horticultural plant having the mainpest, the fruit fly Bactrocera sp. The solution is eviromentally friendly control is the use of trap combined with the attractant of lemongrass (Cymbopogon nardus L.). The purpose of this study is to get the dosage of lemongrass oil which is ablest to trap most fruit fly on starfruit plants. This research was co…