Aedes aegypti
(Image from: http://upload.wikimedia.org/wikipedia/commons/8/83/Aedes_aegypti_during_blood_meal.jpg )
It is very difficult to control or eliminate Ae. aegypti mosquitoes because they have adaptations to the environment that make them highly resilient, or with the ability to rapidly bounce back to initial numbers after disturbances resulting from natural phenomena (e.g., droughts) or human interventions (e.g., control measures). One such adaptation is the ability of the eggs to withstand desiccation (drying) and to survive without water for several months on the inner walls of containers. For example, if we were to eliminate all larvae, pupae, and adult Ae. aegypti at once from a site, its population could recover two weeks later as a result of egg hatching following rainfall or the addition of water to containers harboring eggs.
It is likely that Ae.aegypti is continually responding or adapting to environmental change. It is expected that control interventions will change the spatial and temporal dispersal of Ae. aegypti and perhaps the pattern of habitat utilization.
Aedes albopictus There is a very important adaptation of Ae. aegypti and other dengue vectors that makes controlling their populations a difficult task. Their eggs can withstand desiccation for several months, which means that even if all larvae, pupae, and adults were eliminated at some point in time, repopulation will occur as soon as the eggs in the containers are flooded with water. Unfortunately, there is no effective way to control the eggs in containers.
[Link: http://www.cdc.gov/dengue/entomologyEcology/index.html]
[Link: http://www.cdc.gov/Dengue/entomologyEcology/m_lifecycle.html]
