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Poligono del Giappone, paulonia e altre, specie che per decenni hanno vissuto nei giardini e nei parchi delle zone urbanizzate stanno colonizzando anche i nostri boschi e causando grossi problemi: a dirlo è Roland David, capo della sezione forestale del canton Ticino, che oggi (martedì) ha organizzato ad Avegno e Solduno la sua tradizionale uscita.
Le specie neofite invasive diventano infatti così una minaccia per la biodiversità e per la funzione primariadei boschi ticinesi, quella protettiva. La modifica della legge forestale federale, che entrerà in vigore nel 2017, "permetterà però di finanziare interventi di gestione e contenimento onerosi" e soprattuto darà la possibilità di eliminare le piante madri, che si trovano nel verde dell'abitato.
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