The testing results of the repellent activity of the essential oils from six Murraya species against T. castaneum were presented in Table 4. It was found that all the samples of the essential oils exhibited the obvious repellent activity against T. castaneum. The PR values of all the six samples were higher than 80% at the testing concentrations of 78.63 nL /cm2and 2 h after the insects were exposed . At relatively lower concentration of 0.63 nL/cm2, the PR values of all the six samples were even higher than that of the positive control repellent, DEET at 2 and 4 h after exposure. Moreover, it was found that the variety of the PR values between the samples was obviously affected by the testing concentrations and the exposure duration. For examples, the PR values of M. alata essential oil were all higher than 70% at all the testing concentrations and two exposure durations. Meanwhile the PR values of other five samples had a relatively range.