Metacolus unifasciatus

have host

• Global Biotic Interactions: Tomicus piniperda (Linnaeus & C. 1758) (Common pine shoot beetle)
• Global Biotic Interactions: Tomicus minor Wood & Bright 1992
• Global Biotic Interactions: Pityogenes bidentatus (Herbst & J. F. W. 1783) (Two-toothed pine beetle)
• Global Biotic Interactions: Ips typographus (Linnaeus & C. 1758) (european spruce bark beetle)
• Global Biotic Interactions: Ips acuminatus Wood & Bright 1992

parasitize

• Global Biotic Interactions: Hylurgus micklitzi Wachtl & F. A. 1881
• Global Biotic Interactions: Pityogenes bidentatus (Herbst & J. F. W. 1783) (Two-toothed pine beetle)
• Global Biotic Interactions: Pityophthorus lichtensteini Eichhoff 1864
• Global Biotic Interactions: Pityophthorus glabratus Eichhoff 1878
• Global Biotic Interactions: Picea jezoensis (Siebold & Zucc.) Carrière (Jezo Spruce)