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1 January 2015 Evaluation of Contact Toxicity and Repellency of the Essential Oil of Pogostemon cablin Leaves and Its Constituents Against Blattella germanica (Blattodae: Blattelidae)
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Abstract

The aim of this research was to evaluate contact toxicity and repellency of the essential oil of Pogostemon cablin (Blanco) Bentham leaves against German cockroaches (Blattella germanica) (L.) and to isolate any active constituents. Essential oil of P. cablin leaves was obtained by hydrodistillation and analyzed by gas chromatography (GC) and gas chromatography—mass spectrometry (GC-MS). Twenty-three components were identified in the essential oil, and the main constituents were patchoulol (41.31%), pogostone (18.06%), α-bulnesene (6.56%), caryophyllene (5.96%), and seychellene (4.32%). Inactivity-directed chromatographic separation of the essential oil led to the isolation of pogostone, patchoulol, and caryophyllene as active compounds. The essential oil of P. cablin leaves exhibited acute toxicity against male B. germanica adults with an LC50 value of 23.45 µg per adult. The constituent compound, pogostone (LC50 = 8.51 µg per adult) showed stronger acute toxicity than patchoulol (LC50 = 207.62 µg per adult) and caryophyllene (LC50 = 339.90 µg per adult) against the male German cockroaches. The essential oil of P. cablin leaves and the three isolated constituents exhibited strong repellent activity against German cockroaches at a concentration of 5 ppm. The results indicated that the essential oil of P. cablin leaves and its major constituents have good potential as a source for natural insecticides and repellents.

© The Author 2015. Published by Oxford University Press on behalf of the Entomological Society of America. For Permissions, please e-mail: journals.permissions@oup.com
Xin Chao Liu, Qiyong Liu, Han Chen, Qi Zhi Liu, Shi Yao Jiang, and Zhi Long Liu "Evaluation of Contact Toxicity and Repellency of the Essential Oil of Pogostemon cablin Leaves and Its Constituents Against Blattella germanica (Blattodae: Blattelidae)," Journal of Medical Entomology 52(1), 86-92, (1 January 2015). https://doi.org/10.1093/jme/tju003
Received: 19 March 2014; Accepted: 5 September 2014; Published: 1 January 2015
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