The mosquitoes reappear every year in spring, when the adult specimens that have managed to winter in sheltered places go out into the open. The mosquito females lay their eggs directly in the water or in its close vicinity and are the only ones to sting: they need a blood meal to make the eggs mature.

On our territory have developed both local species and species from other parts of the world; they are distinguished by different eating habits and breeding habits. Local species sting mainly at night and reproduce in natural environments (torrents, ponds, etc.); the “tiger mosquito”, instead, prefers small collections and stagnations of water such as saucers, buckets, bins, tubs and wells.

All mosquitoes need to deposit their eggs in still water areas. A few hours after the deposition the larvae are born, which have a vermiform aspect: it is possible to see them inside containers with stagnant water: they seem to hang upside down under the surface of the water. Within a few days the cycle of maturation takes place and become adult mosquitoes.

Mosquitoes are important in the ecosystems of natural environments because they are prey to fish and birds, but in the city environment they can become too numerous and harassing, making disinfection interventions necessary.


The “tiger mosquito” is a small black mosquito with a white stripe on its back and white bands on its legs, native to the tropical humid forests of Southeast Asia.

The “tiger mosquitoes” are particularly annoying and irritating and sting even in broad daylight, but especially in the cooler hours; with their sting they can also transmit diseases.

The development of the “tiger mosquito” is strictly conditioned by the presence of stagnant water. The eggs are very resistant and can remain vital for several months in dry environments, waiting to be submerged to hatch. It typically reproduces in small-medium water stalls typically urban or domestic such as saucers, buckets, bins, tubs and wells.


Since 2013, the Municipality of Como has undertaken a program of biological control integrated with the tiger mosquito, to limit its spread as much as possible, guaranteeing in any case a reduced environmental impact and full respect for the environment and the health of citizens.

The program includes: 

  • the monitoring of the territory, in the spring months, to identify the sites at risk and the larval outbreaks already present. This activity allows planning disinfestation interventions against larvae, before they can become adults. The larvae disinfestation interventions are carried out on public land, while in the private areas surveys are carried out to inform citizens and to search, census and reduce the outbreaks of larvae development;
  • the positioning of specific monitoring traps, which remain active from May to October to assess the effective presence of “tiger mosquito” and the levels of infestation reached in the municipal territory;
  • the development, during the summer, of antilarval treatments in the drains of the road network, able to prevent the birth of adults during the entire reproductive season of the insect.  Since 2014 , thanks to the availability of a more performing organic product, only a biological protocol is applied in the municipal area.