A survey of mosquito breeding in Accra, Ghana, during a two-year period of larval mosquito control
1970
Chinery, W.A., Departmt:nt of Microbiology, University of Ghana Medical School, P.O. Box 4236, Accra
The breeding of three of six common species of mosquitoes encountered in Accra during two years (Sept. 1964- Aug. 1966) of a larval survey and control is discussed. From data on the seasonal variation in breeding it was observed that after some initial difficulties in the control of Culex decens, larval control of this species was very successful from April 1965 to August 1966.Similarly after an initial set-back, the control of Culex univittatus was also very successful for most part of the control operations. However, the breeding of Culex thalassius was successfully controlled only in the dry season. The control of this species during the rainy season, especially in the second year, was not as successful as was expected. The preferred breeding places of these three mosquito species were concrete drains, earth drains, stagnant streams, burrowpits, rainpools and swamps. Although the first four breeding places were comparatively more numerous than the last two, control of mosquito breeding was more successful in the first four breeding places than in the last two. This is most probably due to inadequate coverage of some of the larger rainpools and swamps with oil and insecticides coupled with the fact that the last two preferred breeding places are among the natural habitats of these species. It was evident that the effect of rainfall on larval control of mosquito breeding was variable. With a torrential downpour lasting a few hours, larvae were washed down into the sea; however, with light but continuous shower numerous water collections were formed which supported breeding.
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