Articles Scientifiques

Histopathological effects of Aspergillus clavatus (Ascomycota: Trichocomaceae) on larvae of the southern house mosquito, Culex quinquefasciatus (Diptera: Culicidae)

Aspergillus clavatus (Ascomycota: Trichocomaceae) was previously found to be an opportunistic pathogen of mosquitoes (Diptera: Culicidae). In the present study, the mechanism leading to its insecticidal activity was investigated regarding histological damages on Culex quinquefasciatus larvae exposed to A. clavatus spores. Multiple concentration assays using spore suspensions (0.5e2.5 ! 108 spores ml"1 ) revealed 17.0e74.3 % corrected mortalities after 48 h exposure.

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Toxic effects of neem products (Azadirachta indica A. Juss) on Aedes aegypti Linnaeus 1762 larvae

Raymond Demba Ndione, Omar Faye , Mady Ndiaye , Abdoulaye Dieye , and José Marie Afoutou

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Gene Flow, Subspecies Composition, and Dengue Virus-2 Susceptibility among Aedes aegypti Collections in Senegal

Background:Aedes aegypti, the ‘‘yellow fever mosquito’’, is the primary vector to humans of the four serotypes of dengue viruses (DENV1-4) and yellow fever virus (YFV) and is a known vector of Chikungunya virus. There are two recognized subspecies of Ae. aegypti sensu latu (s.l.): the presumed ancestral form, Ae. aegypti formosus (Aaf), a primarily sylvan mosquito in sub-Saharan Africa, and Ae. aegypti aegypti (Aaa), found globally in tropical and subtropical regions typically in association with humans. The designation of Ae. aegypti s.l.

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Borrelia infection in small mammals in West Africa and its relationship with tick occurrence inside burrows

Tick-borne relapsing fever (TBRF) is a zoonotic disease caused by several Borrelia species transmitted to humans by Ornithodoros tick vectors. In West Africa, Borrelia crocidurae is a common cause of disease in many rural populations. Small mammals act as reservoirs of infection. We report here the results of surveys that investigated the occurrence of B. crocidurae infection in rodents and insectivores from eight countries of West and Central Africa.

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Inventaire des plantes hôtes comestibles et évaluation du degré d’infestation par Rastrococcus invadens (Willams, 1986) (Homoptera, Pseudococcidae) au Sénégal

Rastrococcus invadens (Willams, 1986) (Homoptera, Pseudococcidae) ou cochenille farineuse est un insecte ravageur de manguier et de plusieurs autres arbres fruitiers dont les agrumes. La cochenille est originaire d’Asie du Sud-est et a été identifiée pour la première fois au Sénégal à Dakar en 1995 (Han et al., 2007). Depuis lors, elle est largement répandue dans tout le pays et plus particulièrement dans les deux zones les plus productives de fruits : Casamance et Thiès.

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