ScienceDaily (Feb. 9, 2009) — Isolongifolenone, a natural compound found in the Tauroniro tree (Humiria balsamifera) of South America, has been found to effectively deter biting of mosquitoes and to repel ticks, both of which are known spreaders of diseases such as malaria, West Nile virus, and Lyme disease.
http://www.sciencedaily.com/releases/2009/02/090205154033.htm