Isobutyl amides--potent compounds for controlling Diatraea saccharalis
2009
Debonsi, Hosana M. | Miranda, José E. | Murata, Afonso T. | de Bortoli, Sérgio A. | Kato, Massuo J. | Bolzani, Vanderlan S. | Furlan, Maysa
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 greater-than-or-equal 100 μg insect⁻¹. The LD₅₀ and LD₉₀ values for compound 1 were 92.83 and 176.50 μg insect⁻¹, and for compound 2 they were 91.19 and 184.56 μg insect⁻¹.CONCLUSION: According to the LD₅₀ and LD₉₀ 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.
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