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The researchers looked at how long enveloped and nonenveloped viruses remained infectious on the surface of six types of wood: Scots pine, silver birch, gray alder, eucalyptus, pedunculate oak and Norway spruce.

In many of the forests that remained, open stands of fire-adapted Scots pine had been replaced by crowded, more fire-prone plantations.

Managers also said work started on Tuesday to chop down trees on Goose Hill, including mature Corsican pine and Scots pine, to make way for an access road for the planned Sizewell C station.

The pinewoods' tree species include Scots pine - Scotland's national tree - as well as birch and juniper.

Separately, a team of Swedish researchers showed that logging in Scots pine forests shrank the fungal community by 95 percent.