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Gnathotrichus sulcatus (LeConte, 1868) - (western hemlock wood stainer)
This ambrosia beetle is found in North and Central America, where it infests felled logs as well as green lumber in sawmill yards. Mainly conifer trees are attacked. Like Gnathotrichus materiarius and G. retusus, it is regarded as an important timber pest in North America and is of quarantine concern to countries importing wood from North America.