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The aim of the study was to evaluate the effects of the seeds, exocarp and aril extracts from  Trichilia catigua  A. Juss. (Meliaceae) against  Spodoptera frugiperda  and present the phytochemical study carried out with the aril extract of  T. catigua . Limonoids were isolated from the aril of  T. catigua  through chromatographic techniques and their structures were proposed by spectroscopic analysis and comparison with literature data. The effects of the seeds, exocarp and aril extracts from  T. catigua  against  S. frugiperda  were evaluated considering as parameters the duration and mortality of the larval phase, in addition to the pupal weight. Phytochemical investigation of the aril extracts of  T. catigua  has led to the identification of the limonoids 6α-O-acetyl-7-deacetyl-14,15-dihydro-15-oxo-nimocinol ( 1 ), cedrelone ( 2 ) and 6α-O-acetyl-7-deacetylnimocinol ( 3 ). The hexane and CH 2 Cl 2  extracts of the aril showed a high rate of larval mortality (100 and 90%, respectively). In addition, a prolongation of larval phase and a reduction in the pupal weight were observed for insects treated with hexane, CH 2 Cl 2  and methanol extracts of seeds and with CH 2 Cl 2  extract of exocarp of  T. catigua.

Limonoids and insecticidal activity on Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) of Trichilia catigua A. Juss. (Meliaceae)