Evaluation of insecticidal activity of Nardostachys jatamansi essential oil against some grain storage insects
Xin Chao Liu and Zhi Long Liu
Water-distilled essential oil from Nardostachys jatamansi (Caprifoliaceae) roots was analyzed by gas chromatography-mass spectrometry (GC-MS). Twenty-nine compounds, accounting for 98.1% of the total oil, were identified. The main components of the essential oil of N. jatamansi were calerene (25.9%), patchouol (10.6%), α-gurjunene (7.5%), aristolone (7.1%) and β-maaliene (6.5%) followed by spathulenol (4.3%). The essential oil had higher sesquiternoids content (85.4%) than monoterpenoids (8.5%). It exhibited contact toxicity with LC50 value of 277.05 mg/cm2 and fumigant toxicity with LC50 value of 0.74 mg/l against Liposcelis bostrychophila.The oil exhibited contact toxicity against Sitophilus zeamais and Tribolium castaneum adults with LC50 values of 70.83 and 45.38 μg/adult, respectively. This oil possessed fumigant toxicity against S. zeamais and T. castaneum adults with LC50 values of 82.13 and 53.29 mg/l. The results indicate that the essential oil of N. jatamansi has potential for development into natural insecticides or fumigants for control of insects in stored grains.
Xin Chao Liu and Zhi Long Liu. Evaluation of insecticidal activity of Nardostachys jatamansi essential oil against some grain storage insects. Journal of Entomology and Zoology Studies. 2014; 2(4): 335-340.