 Symbiotic association between bark beetles and species of blue stain fungi is a well-known and studied phenomenon in the forestry pathology.Some bark beetle species like Mountain Pine Beetle ("Dendroctonus ponderosae)" feed on phloem layer just underneath the bark of a lodgepole pines when they are developing from larval to adult stage.Mountain Pine Beetle carry the spores of at least 2 known blue stain fungi species, "Ophiostoma clavigerum" and "Ophiostoma montium."