Hylobius warreni, Warren's rootcollar weevil, is a common pest of spruce and pine throughout Canada. It causes considerable damage to native species of spruce both in natural stands and in plantations (Rose and Lindquist 1985). Hylobius warreni is 8–11 millimetres (0.31–0.43 in) long, and has a dull black body colour. It is clothed with fine grey scales between the patches of white.