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In this work was described the phytochemical investigation of  Machaerium opacum  Vogel (Fabaceae) leaves as well as the insecticidal activity of its crude extract and fractions against  Atta sexdens  Linnaeus (Hymenoptera: Formicidae). The phytochemical study led to the identification of α-amyrin, β-amyrin, lupeol, phytol, isomucronulatol and rutin, described for the first time in  M. opacum  and mucronulatol. Insecticidal activity was assessed by the ingestion of the crude extract and fractions incorporated into an artificial diet at three different concentrations (0.2, 1.0 and 2.0 mg mL −1 ). Statistical analysis revealed that all the samples of  M. opacum  at all concentrations tested showed significant results when compared to the pure diet control.

Machaerium opacum Vogel (Fabaceae): phytochemical study and toxicity to Atta sexdens Linnaeus (Hymenoptera: Formicidae)