The essential oils obtained by hydrodistillation of the leaves, stems, and shoots of Tephrosia toxicaria Pers (Papilionaceae) were analyzed using GC and GC/MS. Germacrene D was the major component (20.7-33.3 %) of the oils of leaves and shoots, whereas spathulenol was the main constituent (42.3%) of the stem oil. The essential oils from the leaves and stems, when tested for activity against mosquito larvae (Aedes aegypti), gave LC 50 values of 81.3 ± 2.9 and 63.1 ± 1.0 ppm, respectively.
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