RESUMENEl pimiento boliviano (Schinus molle L.) es un árbol del cual se han identificado metabolitos secundarios con actividad insecticida. El objetivo fue evaluar, en condiciones de laboratorio, la actividad insecticida e insectistática del polvo y aceite esencial de frutos de S. molle sobre Sitophilus zeamais. En los bioensayos de toxicidad por contacto la mayor mortalidad se obtuvo con el aceite esencial al 8,0 % con 96,3% de insectos muertos con una CL 50 de 3,82 mL aceite esencial 100 g -1 maíz (3,82%). A la misma concentración el polvo mostró un 63,8% de mortalidad y una CL 50 de 7,95 g polvo 100 g -1 maíz (7,95%). Ambos tratamientos no afectaron significativamente la germinación ni la pérdida de peso del grano. El aceite esencial en la concentración de 8,0% provocó una completa inhibición en la emergencia mostrando una F 1 de 0% de insectos adultos. Todos los tratamientos fueron repelentes y el mayor efecto antialimentario del aceite esencial se registró con la concentración de 16% con 71,2% de inhibición. Se concluyó que el polvo y aceite esencial de S. molle presentan toxicidad insecticida por contacto y efecto repelente e inhibidor de la alimentación sobre S. zeamais. Palabras clave: pimiento boliviano, gorgojo del maíz, monoterpenos ABSTRACTThe pepper tree (Schinus molle L.) has secondary metabolites with insecticidal activity. The objective of this study was to assess under laboratory conditions the insecticidal and insectistatic activity of fruit powder and essential oil of S. molle against Sitophilus zeamais. In contact toxicity bioassays, the highest mortality was observed with essential oil at a concentration of 8.0%, recording 96.3% of dead insects with an LC 50 of 3.82 mL essential oil 100 g -1 maize (3.82%). Powder at the same concentration showed a 63.8 % of mortality with an LC 50 of 7.95 g powder 100 g -1 maize (7.95%). None of the treatments affected germination or grain weight loss. The essential oil at a concentration of 8.0% caused a complete inhibition of F 1, resulting in 0% of adult insects. All treatments had repellent effects. The highest antifeeding effect observed with the essential oil was recorded at a concentration
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