| Summary: | For the management of <i>Spodoptera frugiperda</i>, botanical extracts have been used to reduce the environmental impacts of synthetic chemical pesticides. In the present investigation, the insecticidal activity of the acetonic and methanolic extracts of <i>Heterotheca inuloides</i> (Asteraceae) and of the main compound 7-hydroxy-3,4-dihydrocadalene on this pest as well as its ecotoxicological effect on <i>Poecilia reticulata</i> were evaluated. A greater insecticidal response was obtained from the acetonic extracts than from the methanolic extracts, with LC<sub>50</sub> values of 730.4 ppm and 711.7 ppm for samples 1 and 2, respectively. Similarly, there was a lethal effect on 50% of the <i>P. reticulata</i> population at low concentrations in the acetonic extract compared to the methanolic extract. The sesquiterpene 7-hydroxy-3,4-dihydrocadalene has greater insecticidal activity by presenting an LC<sub>50</sub> of 44.36 ppm; however, it is classified as moderately toxic for guppy fish.
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