Resistance to Insecticide
Insecticide-based control measures (for example, spraying with insecticides indoors and insecticide-treated nets) are the main way to kill Anopheles mosquitoes that bite indoors. However, after prolonged exposure to an insecticide over several generations, mosquitoes, like other insects, may develop resistance -- a capacity to survive contact with an insecticide. Since mosquitoes can have many generations per year, high levels of resistance can arise quickly. Resistance of Anopheles mosquitoes to some insecticides has been documented within just a few years of the insecticides being introduced.
Patterns of Feeding and Resting
Most Anopheles mosquitoes are either active at dusk or dawn, or active at night. Some feed indoors, while others feed outdoors. After blood feeding, some mosquitoes prefer to rest indoors, while others prefer to rest outdoors.
Biting by Anopheles mosquitoes that prefer to be active at night and indoors can be markedly decreased through the use of insecticide-treated bed nets or through improved housing construction to prevent mosquito entry, such as window screens. In contrast, mosquitoes that prefer to feed outdoors are best controlled through destruction of the breeding sites.