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Insecticidal activity of essential oil from Zanthoxylum armatum fructification against two mosquito species

ZHANG Yun1,PENG Ying-Hui1,ZENG Dong-Qin1,CHEN Fei-Fei1,QIN Qiao-Hui1,HUANG Yi2( 1.College of Life Science and Technology,Central South University of Forestry and Technology,Changsha 410004,China;2.Vector and Rat Control Department,Hunan Provincial Center for Disease Control and Prevention,Changsha 410005,China )  
Essential oil,extracted by steam distillation from Zanthoxylum armatum fructification,were tested for their insecticidal activity to the larvae and pupae of Aedes albopictus and Culex pipiens quinquefasciatus under laboratory conditions by means of steeping,and its fumigant activity to the adults of two mosquito species were evaluated by means of sealing conical flask.The volatile components of this oil were also analyzed by gas chromatography-mass spectrometry.Results are given as follows:(1)The 24 h LC50 values of Z.armatum essential oil for I,II,III,IV instar larvae and pupae of Ae.albopictus/Cx.pipiens quinquefasciatus were 25.634/61.472,31.763/76.431,52.356/110.172,258.497/121.884 and 198.263/162.048 mg·L-1,respectively;(2)The LC50 values for adults of Ae.albopictus and Cx.pipiens quinquefasciatus were 24.957 and 29.517 μg·cm-3,respectively;(3)At the dosage of 147.52 μg·cm-3,the death rate of adults of Ae.albopictus and Cx.pipiens quinquefasciatus both were 100%,and the KT50 values for adults of two mosquito species were 3.493 min and 2.993 min,respectively;(4)Eighteen chemical constituents were identified,including 10 kinds of terpenoids compounds which were the main components and accounted for 67.122% of total.This essential oil had a high and rapid poison activity on Ae.albopictus and Cx.pipiens quinquefasciatus,which had potential to develop natural insecticides against mosquitoes.
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