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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

FLORES, Luisiris; SOLANO, Yohan; SANABRIA, María Elena  y  HERNANDEZ, Dilcia. Effectiveness of plant extracts of wild oregano (Lippia origanoides K.) and citronela (Cymbopogon citratus D.C.) on Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae). Idesia [online]. 2017, vol.35, n.4, pp.67-74. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292017000400067.

Vegetal extracts from leaves have been used as pesticides and/or repellents against bacteria, fungi and arthropods. The biological activity of this extracts is due to presence of secondary metabolites (SM), which are synthesized by plants and its concentration varies even in their organs. The concentration of SM groups was determined by layer chromatography in ethanolic extracts (EE) obtained from leaves of oregano (Lippia origanoides K.) and citronella (Cymbopogon citratus D.C.) and the effect of them was evaluated on Rhyzopertha dominica (F.) at concentration of40, 60, 80, 85 and 95% for both of EE, in a random design with factorial array 2x5. The phytochemistry study allowed determine presence in EE of oregano and citronella of essential oil, saponins (2.02 mm and 3.46 mm), alkaloids (0.0975 and 0.1223//L/mL), phenols (0.0899and 0.11375//L/mL) andflavonoids (0.1055 and 0.1312//L/mL), respectively. There were significant differences (P < 0.01) between concentrations evaluated, where dose of 95% caused 56.75% of mortality. In the same way, significant differences between mortality caused for both of EE (P < 0.05) were registered, where the mortality percentage at concentration of 60%, was higher with EE of oregano (35.5%) than with of citronella (16%), while the effectiveness of the latter was always superior to that of oregano, higher doses. SM's in EE were effective producing acceptable values of mortality in R. dominica, to high doses, and its use is recommended as preventive control.

Palabras clave : insecticide; secondary metabolites; mortality..

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