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We tested the feasibility of competitive exclusion as a potential management tactic for the spruce beetle, Dendroctonus rufipennis Kirby, using pre-attack baiting with pheromones of 2 secondary species, Ips _ Mannerheim and Dryocoetes affaber Mannerheim. Spruce beetle attack densities, gallery lengths per square meter, and progeny densities were significantly reduced ' by up to 78% in individual felled trees baited with the/. tr/dens pheromones (___)-ipsdienoland (-)-e/s-verbernol, and the D.doi:10.1093/jee/91.5.1150 fatcat:2gpbsy6bczhnnaw6tvv266ms3i