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Medical, Urban, and Veterinary Entomology

Section Symposium

Advance Research in Insect Repellents On-Demand Presentations

Larvicidal potential of Egyptian essential oils against Culex pipiens larvae (Diptera: Culicidae)

On-Demand
On-Demand

    Presenting Author(s)

  • Hanem F. Khater

    Professor of Parasitology, Benha University
    Benha University
    Benha, Al Qalyubiyah, Egypt

Culex pipiens is a mosquito vector transmitting Rift Valley fever and lymphatic filariasis in Egypt. It is necessary to combat its spread. This study assessed the larvicidal activity of 15 oil, two of them were novels against 4th larval instar of Cx. pipiens. Five concentrations (125, 250, 500, 1000, and 2000 ppm) and three replicates were used for each oil. Mortalities (MOs) were monitored 24 hours post-treatment (PT). After treatment with 2000 ppm for 24 hours, oils could be classified into three groups. The highly effective group induced eight oils (91-100% mortalities): Ricinus communis, Pimpinella anisum, Matricaria chamomilla, Vitis vinifera, Allium sativum, Jasminum sambac, Cinnamomum verum, and Rosmarinus officinalis. Their lethal concentration 50 (LC50) ranged from 454.48  to 754.30 ppm. The moderately effective group resulted in 90% MO (Trigonella foenum-graecum, Simmondsia chinensis, Brassica compestris, and Carum Petroselinum). The LC50 values varied from 823.84 (C. petroselinum) and 1120.91 (S. chinensis) ppm. The least effective group induced >90% MO and included three oils, Cocos nucifera, Zingiber officinale, and Lavandula angustifolia. C. nucifera was the least effective oil.C. nucifera and J. sambac were noval against Cx. pipiens larvae. R. communis, M. chamomilla, V. vinifera, and R. officinalis killed larvae 3.8, 3.7, 3.1, and 2.8 times more effectively than C. nucifera (the reference oil). R. communis, and. chamomilla were recommended for field application as eco-friendly larvicides.