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8340953 
Journal Article 
Effect of essential oils of six local plants used insecticide on adults of Anopheles gambiae, Giles 1902 
Njan Nlã´Ga, AM; Saotoing, P; Tchouankeu, JC; Messi, J 
2007 
Asian Network for Scientific Information 
4 
6 
444-450 
English 
The essential oils extracted of six plants have been tested on adults of Anopheles gambiae (Diptera: Culicidae) in view to determine their insecticide effect. It is about Ocimum canum, Laggera pterodonta, Plectrancthus glandulosus, Eucalyptus camaldulensis, Hyptis spicigera and Pittosporum viridiflorum. These oils have been diluted in the hexane to different concentrations (5, 10, 15, 20, 30, 40 and 50 mg of active matter by m2 of screen) in order to expose anopheles in the OMS-cone. The introduction of 20 anopheleses in cones permits to note that alone two plants Hyptis spicigera and Pittosporum viridiflorum presented a weak insecticide activity. Except P. viridiflorum, the five other plants presented of lethals concentrations 50 (LC50) after 24 h of exhibition. Thus, we record for H. spicigera and efficient concentration Laggera pterodonta to 50 mg m-2. On the other hand Ocimum canum is efficient to the concentration 40 mg m-2. Lethal concentrations 50 (LC50) of O. canum and Plectrancthus glandulosus are, respectively 11.95 and 12.5 mg m-2 after 24 h of exhibition. These essential oils also possess the best lethal h 50 (LH50) with lengths of exhibition of 6 h 36 min 16 sec and 8 h 34 min 12 sec, respectively for O. canum and of P. glandulosus. © 2007 Academic Journals Inc. 
Anopheles gambiae; Essential oils; LC50; LH50