Abstract— This work aimed at evaluating the insecticidal and repellent effect of essential oils of Baccharis trimera and Baccharis articulate leaves against the maize weevil in maize grains. The essential oil was extracted by hydrodistillation and the chemical composition showed that the major constituent was the carquejil acetate (73.6%) for B. trimera and β-pinene (22.3%) and β-cariofilene (21.5%) for B. articulate. Our results show that B. trimera oil was insecticidal and repellent to maize weevil. About 100% of mortality was achieved using concentrations of 0.32 μL.cm-2, after 24 h of exposure and the lower concentration 0.065 µL.cm-2 obtained similar results in 96 h. The LD50 value for B. trimera essential oil was 8.4 μL/ Petri dishes or 0.05 µL.cm-2. The results obtained indicate that the effect insecticidal of the essential oil of B. trimera is probably because of the presence of carquejil acetate. B. articulate showed low insecticidal activity. The values of the Preference level varied from -0.6 (0.065 μL.cm-2) to -0.9 (0.65 μL.cm-2) for B. trimera oil and -0.4 (0.065 μL.cm-2) to -0.7 (0.65 μL.cm-2) for B. articulata oil, being lower than -0.10. The minimum limit to consider that a plant has repellency activity, demonstrating that the both plants oils presents repellency activity. Although from an economical point of view synthetic chemicals are still more frequently used as repellents, we find the essential oil of B. trimera have potential to be used sustainably as bioinseticide by the small farmers.
Keywords— Baccharis trimera, Baccharis articulata, repellency activity, insecticidal activity, small farmer, sustainability.
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