Chiasso Fights Tiger Mosquito 2026 Strategy | Frontaliere Ticino
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Context
Chiasso Arms Against the Tiger Mosquito: Analysis of the 2026 Strategy On April 3, 2026, Chiasso City Councilor Andrea Mini of the Radical Liberal Party (PLR) presented an inquiry to the Chiasso Municipality to address the issue of the tiger mosquito, a problem that many citizens consider of utmost importance, limiting access to open spaces during the summer. The presence of this species, known for transmitting diseases such as dengue and Zika, requires coordinated action. The treatments in the drains, although effective, have a limitation: the precipitation disperses the product, allowing the rapid reproduction of mosquitoes in just 48 hours. This cycle makes the efforts of collaborators and economic resources less efficient. According to estimates from the Chiasso Health Service, over 5,000 drains were treated in 2025, at a cost of 250,000 CHF. However, the tiger mosquito is still present throughout the region. Mini emphasizes: 'A portion of Chiasso citizens regard the massive presence of the tiger mosquito as a marked problem, limiting a serene access to open spaces for a significant part of the summer period.' The proposal includes the distribution of a biological granule to private individuals to raise awareness and encourage direct intervention. The cost of this project is estimated at 150,000 CHF, financed thanks to a contribution from the Ticino Foundation. The proposed strategy also involves collaboration with the City of Lugano and the Canton of Ticino to create a monitoring and control system for the tiger mosquito. The project has already been approved by the Canton Ticino State Council and will be launched by June 2026. Here are some concrete examples of how the strategy could be implemented: Distribution of biological granules to private individuals...
Operational details
Analysis of the Proposed Strategy The strategy proposed by Andrea Mini, Municipal Councillor of Chiasso, focuses on two main fronts: treatments in manholes and awareness of private individuals through the distribution of a biological granulate. The latter, if effective, could reduce mosquito reproduction in areas not directly reachable by municipal operations. However, it is crucial to evaluate its long-term efficacy and cost-benefit for the community. Councillor Mini explains: "Our proposal does not aim to replace municipal actions, but to integrate them, involving the community in managing this problem". This approach is in line with Switzerland's guidelines for managing health risks, as reported in the Federal Law on the Prevention and Control of Diseases (LPCM) of 1994. ### Strategic Comparison | Strategy | Efficacy | Cost | Public Participation | | --- | --- | --- | --- | --- | | Manhole Treatments | High (short term) | Medium | Low | | Biological Granulate | Medium (long term) | Low-Medium | High | ### Efficacy of Manhole Treatments According to Councillor Mini, manhole treatments are effective in the short term but have a limited impact on the mosquito population in the long term. For example, in 2022, the city of Lugano invested 120,000 Swiss Francs in manhole treatments, but the number of mosquitoes remained stable. This could be due to the fact that mosquitoes can reproduce quickly and manhole treatments cannot cover the entire breeding surface. ### Efficacy of Biological Granulate Biological granulate, on the other hand, could be an effective alternative for reducing mosquito reproduction in areas not directly reachable by municipal operations. According to research conducted by the University of Zurich, biological granulate can reduce the mosquito populat...
Key points
Chiasso Arms Against the Tiger Mosquito: Analysis of the 2026 Strategy The fight against the tiger mosquito is a problem that affects not only the municipality of Chiasso, but the entire Ticino region. The tiger mosquito has been identified as one of the main causes of diseases transmitted to humans and domestic animals. In response to this problem, the municipality of Chiasso has announced a strategy to combat the tiger mosquito and protect its population. #### What Citizens Can Do 1. Request of Biological Granules: Residents can request the granules from the municipality, according to the guidelines that will be communicated. The granules are a biological product that is sprayed in areas where the tiger mosquito has been identified, with the aim of killing it and preventing its reproduction. 2. Sensitization: Report stagnant water areas and join community prevention initiatives. The inhabitants of the municipality are invited to report any stagnant water area that could be a habitat for the tiger mosquito. 3. Implications for Border Residents: For border residents who live in Chiasso but work in Italy, it is essential to be informed about the procedures for requesting the granules, even if they are not always present in the municipality during the summer. #### Concrete Action Examples - Chiasso: The municipality of Chiasso has already started distributing the granules in the areas most affected by the tiger mosquito. According to the guidelines, the granules are sprayed every 8 days, from May to September. - Lugano: The municipality of Lugano has announced a similar strategy to combat the tiger mosquito. According to the guidelines, the granules are sprayed every 10 days, from June to August. - Bellinzona: The municipality of Bellinzona has decided to adopt a mor...