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      Potencial de Trichilia pallida Swartz (Meliaceae) como fonte de substâncias com atividade inseticida sobre a traça-do-tomateiro, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) Translated title: Potential of Trichilia pallida Swartz (Meliaceae) as a source of substances with insecticidal activity against the tomato leafminer Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

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          Abstract

          A partir de extratos aquosos e não aquosos de Trichilia pallida Swartz (Meliaceae), objetivou-se identificar frações com atividade inseticida sobre a traça-do-tomateiro, Tuta absoluta (Meyrick). Para tanto, extratos aquosos liofilizados (EAL) a 3%, de folhas e ramos da planta, foram ressuspendidos em água e aplicados, por meio de mini-atomizador, sobre folíolos de tomateiro infestados com lagartas recém-eclodidas. Com base nos resultados de mortalidades aos 5 e 10 dias após a infestação (DAI), considerou-se o EAL de folhas mais eficiente que o de ramos. Numa segunda etapa, foram obtidos por maceração, extratos de folhas em hexano (HEX), diclorometano (DIC) e metanol (MET), os quais foram avaliados a1 % (p/v) como descrito anteriormente, incluindo-se acetona e água como controles. Dentre os referidos extratos, aquele em DIC foi o mais promissor como fonte de substância(s) com atividade inseticida sobre lagartas de T. absoluta. Na seqüência, através de partição líquido-líquido do extrato DIC, obtiveram-se as frações em HEX, MET, acetato de etila (AET), n-butanol (NBU) e aquosa (AQ). Destas frações, a AET e MET a 0,15% foram consideradas as mais promissoras como fontes de substâncias com atividade inseticida sobre T. absoluta.

          Translated abstract

          Organic and aqueous extracts of the Trichilia pallida Swartz (Meliaceae) were obtained for identification of fractions with insecticidal activity against the tomato leafminer Tuta absoluta (Meyrick). Leaf and twig freeze-dried aqueous extracts (FDA) were resuspended in water at 3% and sprayed, with the aid of a mini-atomizer, over tomato leaflets infested with newly-hatched larvae. Larval mortality at 5 and 10 days after infestation (DAI) were higher for leaf extracts. In a second set of experiments, leaf extracts at 1% (w/v) were obtained by maceration in hexane (HEX), dichloromethane (DIC) and methanol (MET), and tested as described above using acetone and water as control. DIC extracts were the most promising as a source of substances with insecticidal activity against larvae of T. absoluta. DIC leaf extracts were further processed and subjected to partition assays, producing fractions in HEX, MET, ethyl acetate (ETA), n-butanol (NBU) and water (WA). The 0.15% ETA and MET fractions obtained from the partition assay of DIC extracts showed the highest insecticidal activity against T. absoluta.

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          Most cited references26

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          Bioecologia de Trichogramma pretiosum Riley, 1879, nas traças, Scrobipalpuloides absoluta (Meyrick, 1917) e Phthorimaea operculella (Zeller, 1873), em tomateiro

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            Flutuação populacional da traça-do-tomateiro no Distrito Federal

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              Antifeeding activity of limonoids from Khaya senegalensis (Meliaceae)

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ne
                Neotropical Entomology
                Neotrop. entomol.
                Sociedade Entomológica do Brasil (Londrina )
                1678-8052
                August 2005
                : 34
                : 4
                : 667-673
                Affiliations
                [1 ] USP
                [2 ] Universidade Federal de São Carlos Brazil
                Article
                S1519-566X2005000400018
                10.1590/S1519-566X2005000400018
                ecd394c6-4d59-41c5-9964-177e4441fe92

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1519-566X&lng=en
                Categories
                ENTOMOLOGY

                Entomology
                controle,Insecta,botanical insecticide,natural product,control,inseticida botânico,produto natural

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