Insecticidal activity of four plant essential oils against two stored product beetles
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
The insecticidal properties of essential oils prepared using water distillation method from aerial parts of Mentha piperita, Mentha pulegium, Zataria multiflora and Thymus daenensis were investigated on adult stage of Bruchus lentis and Callosobruchus maculatus. Essential oils were used in five concentrations and five replications. The concentration selected based on primary experiment for each essential oil. Mortality rate of insects were recorded after 3, 6, 24, 48 and 72 hours. Results indicated that the longer exposure of insect to essential oil and the higher concentration of essential oil, increased mortality of the two-beetle species in all treatments. There was significant difference among mortality effect of the essential oils. The LC50 value of M. piperita after 24 hours for B. lentis and C. maculatus were 14.62 and 13.70 μl/lair respectively, while the values of LC50 were 92.32 and 95.80 for M. pulegium, 58.43 and 99.94 for Z. multiflora and 63.97 and 65.55 μl/lair for T. daenensis, respectively. The least LT50 recorded was in T. daenensis essential oil with 26.21 and 24.15 hours against B. lenis and C. maculatus, respectively. Results showed that these essential oils can be as safe botanical pesticides for control of storage pests.
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