oa Journal of the Entomological Society of Southern Africa - Further studies on the overwintering stages of Culex mosquitoes (Diptera: Culicidae) in the highveld region of South Africa



Field observations were made near Johannesburg to study the overwintering biology of Culex species in the highveld region of South Africa. Small numbers of adult females were collected in bait-traps intermittently during the winter. These were all nullipars in the case of C. pipiens and C. theileri which suggests that mosquitoes can either emerge in the autumn and overwinter, taking occasional blood-meals, or that they may emerge during warmer spells in winter and take blood. Some emergence observed in larvae of these 2 species in July supports the former. The only 2 catches of C. univiltalus were composed of pars. Winter larvae of C. theileri, C. pipiens and C. rubinolus were collected and further observations on the first 2 species showed that these larvae can overwinter in a state of quiescence.


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