level risk to the crowded urban population. The (Web hosting linux)
level risk to the crowded urban population. The public health implications of this urbanization/modernization problem and solutions are discussed. Experimental Wuchereria bancrofti infection of Culex quinquefasciatus and Aedes aegypti. Anosike JC; Onwuliri CO Medical Entomology and Parasitology Research Laboratory Department of Zoology, University of Jos, Nigeria. Angew Parasitol (GERMANY) Aug 1992, 33 (3) p139-42, ISSN 0003-3162 Laboratory-derived females of Culex quinquefasciatus and Aedes aegypti were experimentally infected with Wuchereria bancrofti by allowing the insects to feed on infected volunteers of known microfilariae density between 24.00 and 2.00 hours. Of the 240 mosquitoes used for the experiments only 67 (55.8%) of C. quinquefasciatus and 83 (69.2%) of the Ae.aegypti actually fed on the volunteers’ blood. After 16 days post-infection period, 50 (74.62%) of the engorged C. quinquefasciatus harboured infective L3 larval stages of W. bancrofti, while 16 (23.9%) and 1 (1.49%) harboured L2 and Ll pre-infective larval stages, respectively. On the other hand, no development to the L3 infective stage was observed in the engorged Ae.aegypti though 34 (40.96%) harboured Ll pre-infective stages of the parasite. Our results suggest that C.quinquefasciatus could be actively involved in the transmission of urban bancroftian filariasis in Nigeria. Isolation and characterization of four new strains of Bacillus sphaericus from central Nigeria highly toxic to mosquito larvae. Orduz-Peralta S; Diaz T; Restrepo N; Rojas W; Yousten AA Biological Control Section, H.P.T.U., Medellin, Colombia. J Invertebr Pathol (UNITED STATES) Jul 1992, 60 (1) p107-8, ISSN Septic tank mosquitoes: competition between species in central Nigeria. Irving-Bell RJ; Okoli EI; Diyelong DY; Lyimo EO; Onyia OC Department of Zoology, University of Jos, Nigeria. Med Vet Entomol (ENGLAND) Jul 1987, 1 (3) p243-50, ISSN 0269-283X Exit traps, placed over the air vents of septic tanks, were used to examine species diversity and relative abundance of mosquitoes breeding in ammonia-rich waters of septic tanks. Of the six species found, Culex decens Theobald and Culex cinereus Theobald appeared to be competing successfully with Culex quinquefasciatus Say during the wet season but not during the long dry season. The seasonal timing of their displacement by Cx quinquefasciatus was variable and did not correlate well with climatic factors. The three other species present, generally during the wet season and early dry season, were Culex tigripes G. & C., Culex horridus Edwards and Aedes aegypt (L.). Experimental bucket ovitraps were used to assess preference towards covered (dark) septic tank water in comparison with sunlit septic tank water, covered and sunlit compost water. These were colonized by Cx quinquefasciatus, Cx decens, Ae. aegypti and Ae. vittatus Bigot. The covered septic tank water was more abundantly colonized by Cx quinquefasciatus and marginally so by the two Aedes species. Cx decens appeared to colonize the exposed compost water more readily in the dry season, but changed to the covered septic tank water in the wet season. The discussion centres around competition between these mosquitos species and concludes that it would be useful to know what environmental factors, or what aspects of competition, lead to severe natural reductions in the abundance of the major pest species Cx quinquefasciatus. Part I-21
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