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Secondary metabolites from Annonaceae: screening, bioguided fractionation and bioactivity against Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) A screening with ethanolic extracts prepared from structures (leaves, branches and seeds) from different species of Annonaceae (Annona cacans, A. montana, A. mucosa, A. reticulate, A. sylvatica and Duguetia lanceolata) aiming to detect management alternatives for Spodoptera frugiperda (Lepidoptera: Noctuidae) was done. Based on this initial phase, it was verified that the ethanolic extract from seeds of A. mucosa (AMSE) was the most promising one, causing significant acute toxicity (LC50 and LC90 of 842.97 and 1,822.00 mg kg, respectively) and pronounced inhibition of larval development (chronic toxicity) after a 7-day exposition to treated diets. At LC50, AMSE decreased larval and pupal viabilities and also the pupal weight at 24 hours, and increased the larval phase duration. However, AMSE didn’t cause antifeedant effect for 4-instar S. frugiperda larvae, though it decreased consumption throughout the time. After that, AMSE efficacy was compared to commercial pesticides from natural (Azamax 1.2 EC) and synthetic (Premio SC) origin. In this confrontation, AMSE (at LC90) showed efficacy similar to that of commercial products (used at registered dose for S. frugiperda control). Then, the bioguided fractionation using different chromatographic techniques which led to isolation of acetogenin rolliniastatin-1 identified as the majoritary compound of the most active ethanolic extract from A. mucosa. After that, rolliniastatin-1 was again tested against S. frugiperda larvae and caused significant acute (larval mortality) and chronic (decrease of larval development) effects. Finally, the bioactivity of a newly-registered acetogenin-based (Anosom 1 EC) formulation was investigated, both separately and mixed with a limonoid-based formulation (Azamax 1.2 EC). Anosom 1 EC, tested at estimated LC90 (2,959.00 mg kg) and Azamax 1.2 EC, tested at registered dose for S. frugiperda (4,000.00 mg kg) led to significant larval mortality, without happening any differences between treatments either tested separately or in a binary mixture. Anosom 1 EC (at LC50) also led to significant increase of larval and pupal mortality and larval phase, as well as insect pupal weight decrease. Thus, Annonaceae derivates can be a useful component for S. frugiperda integrated management under field conditions.

Metabólitos secundários de Annonaceae: triagem, fracionamento biomonitorado e bioatividade frente a Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae)