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La zanzare tigre, potenziale vettore di malattie infettive tropicali, è stata monitorata nel Cantone dei Grigioni per tutto il 2016. I controlli, come si legge nel comunicato trasmesso lunedì, hanno permesso di accertare la presenza di uova di questa specie invasiva nei comuni di San Vittore, Roveredo, Grono e nella aree di sosta autostradali Thusis e Heidiland.
Al fine di poter confermare l'esistenza di popolazioni di zanzare tigre stabilite nelle aree prese in esame è importante proseguire con le analisi anche nel 2017. I controlli futuri permetteranno di appurare se gli esemplari siano o meno sopravvissuti all'inverno.
Per la popolazione delle zone interessate è importante sapere che le zanzare tigre depositano le luova in piccoli accumuli di acqua stagnante. Una semplice misura di prevenzione è quindi quella di asciugare regolarmente per esempio i vasi di fiori all'aperto, i sottovasi, i giocattoli per bambini, le vaschette per uccelli, come pure i contenitori dell'immondizia.
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