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  • Title: Insecticidal and biting deterrent activity of rose-scented geranium (Pelargonium spp.) essential oils and individual compounds against Stephanitis pyrioides and Aedes aegypti.
    Author: Ali A, Murphy CC, Demirci B, Wedge DE, Sampson BJ, Khan IA, Baser KH, Tabanca N.
    Journal: Pest Manag Sci; 2013 Dec; 69(12):1385-92. PubMed ID: 23423995.
    Abstract:
    BACKGROUND: Rose-scented geranium, Pelargonium spp., essential oils from the cultivars 'Bourbon', 'China', 'Egypt', 'Rober's Lemon Rose' and 'Frensham' were analyzed by GC-FID and GC-MS. A total of 136 compounds were identified from five essential oils, constituting 85.5-99.7% of the oils. Essential oils and pure compounds were evaluated for their insecticidal activity against Stephanitis pyrioides and larvicidal and biting deterrent activity against Aedes aegypti. RESULTS: All five geranium oils were toxic to S. pyrioides, and four of these five were more potent than malathion and neem. Trans-nerolidol (LD50 = 13.4 ppm) was the most toxic compound against one-day-old Ae. aegypti larvae, followed by geraniol (49.3 ppm), citronellol (49.9 ppm) and geranyl formate (58.5 ppm). Essential oil of cultivar 'Egypt' at 100 μg cm(-2) [biting deterrent index (BDI) = 0.8] showed the highest biting deterrent activity, followed by cultivars 'Frensham' (BDI = 0.76), 'China' (BDI = 0.72), 'Rober's Lemon Rose' (BDI = 0.63) and 'Bourbon' (BDI = 0.45) essential oils. Among the pure compounds, the biting deterrent activity of geranic acid (BDI = 0.99) was not significantly different from that of N,N-diethyl-m-toluamide (DEET). CONCLUSION: Essential oils and pure compounds showed insecticidal activity against S. pyrioides and Ae. aegypti. The high biting deterrent activity of geranic acid points to the need for further research.
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