Dried leves powder of Vitex trifolia, Linn, is used tradisionally as 1976 corvette center console insect repellent.The activity of the essential oil (isolated from the leaves) and this fractions were studied as a repellent against Chrysomya sp.Fraction E contained a single component and has proven as the most effective to repel Chrysomya sp.According to the spectra of UV, IR, and GC-MS analysis, the single component of fraction fanimation triaire 52 E was identified as 4-methyl-1-(methylethy)3-cyclohexnol.