Chemical composition, insecticidal and insect repellent activity of Schinus molle leaf essential oil against Tribolium confusum, Rhyzopertha dominica and Sitophilus granarius

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The present study determines the chemical profile of Schinus molle L. essential oil and its toxicity and repellent effect on Tribolium confusum , Rhyzopertha dominica and Sitophilus granarius adults. Ninety-seven compounds were identified and the most abundant were ß-eudesmol (5.872%), elemol (9.028%), α-phellandrene (12.104%) and ß-phellandrene (16.613%). The phytochemical analysis of Schinus molle showed the presence of quinones, flavonoids, leucoanthocyan in , steroids and sap o nins. The oil demonstrated an insecticidal activity against Tribolium confusum (LC 50 = 170.30 μL/L), Rhyzopert h a dominica (LC 50 = 174.30 μL/L) and Sitophilus granarius (LC 50 = 241.20 μL/L) at 12h after treatment. T. confusum is the most sensitive to the treatment followed by R. dominica and S. granarius . Contact is the most effective mode of application compared to fumig a tion. Moreover, this essential oil exhibited a repellent activity as a function of the exposure time and concentrations. A selection index (Si) of 0.26, 0.35 and 0.15 with 20 µL/mL concentration was registered, showing the highest repellent activity against T. confusum , R . dominica and S . granarius , respectively.

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