A significant outbreak of the damaging Asian longhorn beetle has been found in canton Fribourg.
The beetle attacks hardwood trees and kills them. It was first found in the country in 2011 - again in Fribourg.
Around 100 trees will need to be cut down.
The cantonal forest service will now search for further outbreaks nearby, using specially trained dogs.
A buffer zone will also be set up which means no green waste can be transported out of the infected zone.
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