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Field studies on the gonotrophic cycle of Aedes aegypti in Bangkok, Thailand.

The gonotrophic cycle of Aedes aegypti, the principal vector of dengue hemorrhagic fever, was studied during the wet, cool-dry, and hot seasons in Bangkok using a technique of release and recapture of mosquitoes of known age and physiological condition. During the cool-dry season there was a delay of 1–2 days, in comparison with the other seasons, before the mosquitoes took their 1st blood meal. The duration of the gonotrophic cycle during the hot season was 3 days. The delay in taking a blood meal during the cool-dry months reduces the degree of man-mosquito contact and consequently the vectorial capacity of the mosquito. The implications of the findings on the strategy of control operations against adult mosquitoes are discussed.