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Eucalyptus camaldulensis Dehnh. - syn. Eucalyptus rostrata Schlecht. - Myrtaceae - red gum, Roter Eukalyptus
Large evergreen tree, native to Australia.
„A new compound named eucamalol and 4-isopropylbenzyl alcohol were isolated as mosquito repellents from the essential oil of Eucalyptus camaldulensis. The structure of eucamalol was elucidated to be 3-formyl-6 alpha-isopropyl-2-cyclohexen-1 beta-ol by 1H NMR analysis and confirmed by synthesis. Both compounds exhibited potent repellent activities against Aedes aegypti.“
[New mosquito repellent from Eucalyptus camaldulensis., Watanabe, K., Shono, Y., Kakimizu, A., Okada, A., Matsuo, N., Satoh, A., Nishimura, H., Journal of Agricultural and Food Chemistry, Vol.41(11), 1993, 2164-2166]
„The mosquito-repelling activity of 4-isopropylbenzyl alcohol and eucamalol were examined against A. aegypti (Table 11.3) in comparison with that of DEET. All tested compounds exhibited potent mosquito repelling activities against A. aegypti immediately after the application. In 1 h after treatment, the effectiveness of 3 was lost. Although the duration of the effectiveness for DEET was within 2 h after the treatment by our test method, eucamalol showed 75% repellency even 3 h after the treatment. This result indicates that the
repellency of eucamalol against A. aegypti is superior to that of DEET.“
[Potent mosquito repellents from the leaves of Eucalyptus and Vitex plants., Nishimura, H., Satoh, A., In: Biologically active natural products: Agrochemicals, 199, 137-146]
Maiden, J.H., Forest Flora of New South Wales, vol. 7: t. 233 (1917-1921) [M. Flockton]
http://www.plantillustrations.org/species.php?id_species=410197