During our screening program for agrochemicals from Chinese medicinal herbs and wild plants, the essential oils of
Evodia calcicola and
Evodia trichotoma leaves were found to possess strong repellency against the red flour beetle
Tribolium castaneum adults, the cigarette beetle
Lasioderma serricorne adults and the booklouse
Liposcelis bostrychophila. The two essential oils obtained by hydrodistillation were investigated by GC-MS. The main components of
E. calcicola essential oil were identified to be (-)-β-pinene (44.02%), β-phellandrene (20.93%), ocimene (16.49%), and D-limonene (9.87%). While the main components of the essential oil of
E. trichotoma were D-limonene (69.55%), 1R-a-pinene (11.48%), caryophyllene (2.80%) and spathulenol (2.24%). Data showed that
T. castaneum was the most sensitive than other two stored product insects. Compared with the positive control, DEET (N, N-diethyl-3- methylbenzamide), the two essential oils showed the same level repellency against the red flour beetle. However, the essential oil of
E. trichotoma showed the same level repellency against the cigarette beetle, while
E. calcicola essential oil possessed the less level repellency against
L. serricorne, relative to the positive control, DEET. Moreover, the two crude oils also exhibited strong repellency against
L. bostrychophila, but lesser level repellency than the positive control, DEET. Thus, the essential oils of
E. calcicola and
E. trichotoma may be potential to be developed as a new natural repellent in the control of stored product insects.
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