Mosquitoes cause great nuisance to man. Some species even pose threats to public health as vectors of diseases like dengue fever - a severe mosquito-borne disease characterised by high fever, headache, rash, joint and muscular pain. Aedes albopictus, a vector of dengue fever and dengue haemorrhagic fever, is prevalent in Hong Kong. It breeds both in rural and urban areas and its breeding places can be grouped into two broad categories: artificial receptacles like containers, discarded tyres, lunch boxes and cans; and natural habitats such as tree holes, bamboo stumps and leaf axils.
Control of adult mosquitoes is the most familiar aspect of mosquito control to most people. It is accomplished by ground-based applications or via aerial application of chemical pesticides such as thermal fogging. This is done primarily in outdoor areas. The frequency of the treatment depends of the intensity of the problem.
In this treatment we spray a colourless and odourless insecticide on the walls. The insecticide is harmless for human beings. The mosquitoes sit on the wall, come in contact with the insecticide and die. This treatment is effective for 2 to 3 months.
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