insecticidal effect of essential oils of Origanum majorana against Culex pipiens.
insecticidal effect of essential oils of Origanum majorana against Culex pipiens.
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DOI: https://doi.org/10.22533/at.ed.9662430044
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Palavras-chave: biopesticide, huiles essentielles, Origanum majoran, Culex pipiens.
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Keywords: biopesticide, essential oils, Origanum majorana, Culex pipiens
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Abstract: The use of conventional pesticides is one of the most widespread methods of combatting harmful insects and disease vectors. However, the side effects of these chemicals on the environment as well as on human health have encouraged the development of several alternative methods to chemical control, such as the use of biopesticides. The objective of this work is to test the effectiveness of essential oils from the leaves of Origanum majorana, cultivated on the region of Ain Defla, against the disease vector Culex pipiens. Toxicological tests were conducted with a series of essential oil solutions (5, 10 and 20 µl) prepared in tubes containing 1 ml of ethanol. Three repetitions were performed in containers holding 15 newly ecdysed L3 stage larvae and 150ml of rearing water. The results revealed a toxic effect with a concentration-response. A very significant mortality rate was observed after treatment with Origanum majorana, especially the mortality rate reached with the highest concentration and with the lowest concentration. The LC50 and LC90 are respectively: 5.37µl/ml and 15.48 µl/ml.
- DJEGHADER Nour El-Houda
- Amira khedidja
- Fraia Asma
- Gacem Habiba
- Meziri Fayçal
- Chaouch Rabah
- Delhoum Hadia
- Boughendjioua Hicham
- Boudjelida Hamid