The volatile fraction of T. parthenium is characterized by a high camphor (44%) and trans-chrysanthenyl acetate (23%) content. T. vulgare oils, obtained from specimens growing in the province of Eastern Flanders (Belgium), conformed to the infra-specific chemical variability; three chemical types were identified: i.e., the β-thujone, trans-chrysanthenyl acetate and camphor/β-thujone types. A small scale experiment confirmed the mosquito-repellent activity of T. vulgare, without allowing the identification of the active principle. However, the activity was much lower than that of diethyltoluamide containing commercial preparation.
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Pooter et al. (1989) studied this question.
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