ABSTRACT Chili (Capsicum annuum L.) is a horticultural plant having the main pest, the fruit fly Bactrocera sp. The safe and effective is that controlling the use of trap combined with the attractant of basil plant leaves (Ocimum basilicum L.). The purpose of this study is to get the ablest dosage of basil leaf oil which is ablest to trap fruit fly. This research was conducted at STIFARM P…