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EnglishThis study validated the use of leaf 17 on the sampling of Opsiphanes invirae Hubner (Lepidoptera: Nymphalidae) through the quantification of caterpillar abundance on the different spirals leaves, in comparison to leaf 17, and, on the apical, intermediate and basal leaf regions. This study was performed in the state of Para, between March-2014 and March-2015. Results confirmed that leaf 17 is the most adequate method for monitoring this defoliator pest. Key words: Defoliator insects; Elaeis guineensis Jacquin (Arecaceae); monitoring; oil palm portuguesEsta pesquisa validou a utilizacao da folha 17, nas amostragens de Opsiphanes invirae Hubner )Lepidoptera: Nymphalidae), atraves da quantificacao da abundância de lagartas nas diferentes folhas que compoem os espirais em comparacao com a folha 17, e, em diferentes regioes da folha (apical, intermediaria e basal). O estudo foi realizado no Para entre marco de 2014 e marco de 2015. Os resultados confirmam que a folha 17 e a mais adequada para ser utilizada no monitoramento desse desfolhador. Palavras-chave: Desfolhadores; Elaeis guineensis Jacquin (Arecaceae); monitoramento; palma de oleo d

Validation of the sampling methodology for Opsiphanes invirae caterpillars on oil palm plantations in the Brazilian Amazon