1. Insecticidal and repellent activities of Cananga odorata leaf essential oil (Lam.) Hook. F. & Thomson against a post-harvest pest of rice: Sitotroga cerealella Olivier
- Author
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Adjalian Elvis, Philippe SESSOU, Alitonou Guy Alain, Michels Franck, Avlessi Félicien, Fauconnier Marie-Laure, Kossou Dansou, and Dominique Sohounhloue
- Abstract
Today the use of plant extracts, in particular essential oils, is a natural alternative to synthetic insecticides in the fight against crop pests. The purpose of this research is to determine the chemical composition of the ylang-ylang Cananga odorata (Lam.) Hook. F. & Thomson leave essential oil and to evaluate on the one hand its ovicidal, larvicidal, insecticidal, anti-oviposition and insect repellent properties, and on the other hand its effectiveness in preserving the weight of the grains and the germination power of rice seeds against the Angoumois grain moth Sitotroga cerealella O., a major pest of rice in Benin. The essential oil from the leaves of the C. odorata (Lam.) Hook. F. & Thomson was obtained by hydro-distillation, and analysed by gas chromatography-mass spectrometry (GC-MS). The analysis showed that the oil contains 32 main compounds, the major ones being α-pinene (7.01%), lavandulyl acetate (7.19%), caryophyllene (30.33%), α-humulene (13.42%) and germacrene D (8.99%). Based on the findings of fumigation bioassays, the Cananga odorata (Lam.) Hook. F. & Thomson essential oil showed high toxicity against adult of the S. cerealella with values CL50 of 0.094μl/mL and CL90 of 0.46μl/mL. Similarly, our work has demonstrated that this oil has ovicidal and larvicidal or egg development retardant properties. It also caused strong oviposition inhibition activity of more than 97% in female of the S. cerealella O. and subsequently developed very good repellent or deterrent properties, with an average repellence rate of 75.7% against the S. cerealella O. insect. These insecticidal effects preserved grain weight, with weight losses of at most 0.38% and a paddy rice seed germination rate of more than 80% at the lowest applied dose of 0.2µL/mL.The essential oil from the leaves of the C. odorata (Lam.) Hook. F. & Thomson can be used as an alternative to modern toxic synthetic chemicals, for protection against this important pest of grains in storage in Benin. more...
- Published
- 2022
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