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Autorità ed esperti sono preoccupati per l’aumento di esemplari di bostrico tipografo, famelico insetto che può uccidere un albero nel giro di due o tre settimane.
Questi coleotteri si moltiplicano senza freni, anche perché la primavera calda e secca si è dimostrata un clima ideale. A inizio giugno il Canton Giura ha lanciato l'allarme: i suoi esperti temono la sparizione di interi boschi.
Le morti di alberi causate dal bostrico potrebbero superare la cifra record registrata nel 2003. Quell'anno a causa della tempesta Lothar e di un'estate rovente erano stati abbattuti 50'000 metri cubi di legno.
La situazione è particolarmente grave in Romandia e nel nord della Svizzera, ha spiegato Valentin Queloz dell'Istituto federale di ricerca per la foresta, la neve e il paesaggio (WSL).
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