response to chemical cue during pre-oviposition stage and oviposition response to emanations from larva and pupa IDOMAL:0002417 IDOMAL:0002417 Some gravid mosquitoes oviposit preferentially on water that previously contained larvae, pupae, exuviae or emerging adult, this was ascribed to chemical factors produced by them. Those factors are classed as pheromones by some authors. idomal_namespace