Isobutyl amides - potent compounds for controlling Diatraea saccharalis

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Debonsi, Hosana M.
Miranda, Jose E.
Murata, Afonso T.
de Bortoli, Sergio A. [UNESP]
Kato, Massuo J.
Bolzani, Vanderlan da Silva [UNESP]
Furlan, Maysa [UNESP]

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John Wiley & Sons Ltd


BACKGROUND: A dichloromethane-methanol extract of the seeds of Piper tuberculatum Jacq. (Piperaceae) and two isobutyl amides, 4,5-dihydropiperlonguminine (1) and pellitorine (2), which were isolated by chromatographic methods, were assayed for their lethality against the sugarcane borer Diatraea saccharalis F. (Lepidoptera: Pyralidae).RESULTS: Bioassays were carried out with fourth-instar caterpillars through topical application of test solutions to the dorsal surface of the prothorax, and dose-response correlations were determined. Significant insect mortalities were observed 24, 48 and 72 h after treatment at concentrations of >= 100 mu g insect(-1). The LD(50) and LD(90) values for compound 1 were 92.83 and 176.50 mu g insect(-1), and for compound 2 they were 91.19 and 184.56 mu g insect(-1).CONCLUSION: According to the LD(50) and LD(90) for compounds 1 and 2, it can be inferred that the values reflect an acute lethal response to both compounds, based on interaction(s) of the toxicants with a primary target or series of targets. Thus, the amides were demonstrated to have potential value in the control of the sugarcane borer. (C) 2008 Society of Chemical Industry



Piper tuberculatum, Diatraea saccharalis, sugarcane borer, isobutyl amides

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Pest Management Science. Chichester: John Wiley & Sons Ltd, v. 65, n. 1, p. 47-51, 2009.