Possíveis fatores químicos na água que influenciam as fêmeas de culex pipiens fatigans para ovoposição

Abstract

Chemical and physical factors in water are known to attract females of several mosquito species and to stimulate them to lay eggs. Laboratory observations were made on the attractiveness of distilled water and of a 0,03 M solution of NaCl, containing or having previously contained larvae, young pupae or mature pupae of Culex pipiens fatigans. In ali experimenta, Hquids in which pupae were placed proved most effective in attracting female Culex pipiens fatigans and inducing them to lay eggs. The results suggest that pupae release a chemical into their surroundings which induces gravíd females to lay eggs in the place where pupae are or nave been Hving