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Mavoungou J.F.,Institute Of Recherche En Ecologie Tropicale Iret | Mavoungou J.F.,Université des Sciences et Techniques de Masuku | Kohagne T.L.,University of Yaounde I | Acapovi-Yao G.L.,University Of Cocody Abidjan Cote Divoire | And 3 more authors.
African Journal of Ecology | Year: 2013

The vertical distribution of Stomoxys spp. was studied in a rainforest area, Ipassa-Makokou biosphere reserve located in the Ivindo National Park of Gabon. From April to June 2006, Vavoua traps were set out during 15 consecutive days per month at different heights above ground level corresponding to vertical layers of rainforest: 50cm, 10, 20 and 30m. Stomoxys calcitrans, S.transvittatus, S.omega, S.niger niger and S.niger bilineatus were more abundant at near ground level (50cm), whereas abundance of S.xanthomelas was greatest in traps higher (20 and 30m) in the canopy. Fly abundance was significantly different among vertical layers of the forest (H=36.91; P<0.001, ddl=3), and among species to another (H=41.11, P<0.001). Vertical distribution of fly species corroborates feeding behaviour as the identification of blood meal origins showed heterogeneity of feeding hosts. High densities of flies were also observed at 10m, and most S.inornatus were captured at that level. These results show that Stomoxyine flies in this rainforest are present in all vertical layers, from the ground level to the canopy. Their ubiquity, regarding both their habitats and their hosts, should be taken into account if a vector control strategy is planned in this touristic area. © 2012 Blackwell Publishing Ltd.

Aboua L.R.N.,University of Cocody Abidjan Cote dIvoire | Seri-Kouassi B.P.,University of Cocody Abidjan Cote dIvoire | Koua H.K.,University of Cocody Abidjan Cote dIvoire
European Journal of Scientific Research | Year: 2010

The insecticidal activity of essential oils extracted by hydro distillation from three aromatic plants from Côte d'Ivoire, Ageratum conyzoides L. (Asteraceae), Citrus aurantifolia Christm (Rutaceae) and Melaleuca quinquenervia L. (Myrtaceae) was tested by fumigation on the flightless form of the cowpea weevil, Callosobruchus maculatus F. Concentration of 6.7; 10; 16.7 and 33.3 μl/l were evaluated at a temperature of 27.5 ± 0.2°C and at a relative humidity of 80.3 ± 1.6%. The chemical composition of the essential oils used was established by GC/MS analysis. These oils presented an insecticidal activity and induced, in the females of C. maculatus, a very significant reduction of lying (4.79±0.75 (C. aurantifolia), 3.75±0.28 (A. conyzoides) and 1.81±0.53 (M. quinquenervia) at the lower concentration (6.7 μl/l) compared to that in the control (51.23±0.32). The essential oils of M. quinquenervia with the LC 50=3.09 μl/l was more effective than that of A. conyzoides (8.05 μl/l) and C. aurantifolia (6.89 μl/l). © EuroJournals Publishing, Inc. 2010.

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