Fungal diseases
| | Annosus root disease | Heterobasidion annosum
Spiniger meineckellum [anamorph] |
| Armillaria root disease | Armillaria solidipes
Armillaria spp. |
| Black stain root disease | Leptographium wageneri var. pseudotsugae |
| Blue stain fungus | Grosmannia clavigera |
| Bleeding sap rot | Stereum sanguinolentum |
| Brown crumbly rot | Fomitopsis pinicola |
| Brown cubical rot | Laetiporus sulphureus |
| Brown trunk rot | Fomitopsis officinalis |
| Charcoal root disease | Macrophomina phaseolina |
| Conifer – aspen rust | Melampsora medusae |
| Conifer – cottonwood rust | Melampsora occidentalis |
| Cytospora canker | Leucostoma kunzei
Cytospora kunzei [anamorph]
Valsa abietis
Cytospora abietis [anamorph] |
| Damping-off | Fusarium spp.
Phytophthora spp.
Pythium spp.
Rhizoctonia spp. |
| Dermea canker | Dermea pseudotsugae |
| Dime canker | Durandiella pseudotsugae |
| Fusarium hypocotyl rot | Fusarium oxysporum |
| Gray-brown sap rot | Cryptoporus volvatus |
| Gray mold | Botrytis cinerea
Botryotinia fuckelinana [teleomorph] |
| Laminated root rot | Phellinus weirii |
| Phoma seedling blight | Phoma eupyrena |
| Phomopsis canker | Diaporthe lokoyae
Phomopsis lokoyae [anamorph] |
| Phytophthora root rot | Phytophthora spp. |
| Pitted sap rot | Trichaptum abietinum |
| Red-brown butt rot | Phaeolus schweinitzii |
| Red ring rot | Phellinus pini |
| Rhabdocline needle cast | Rhabdocline pseudotsugae
Rhabdocline weirii |
| Rhizina root disease | Rhizina undulata |
| Rose fomes rot | Fomitopsis cajanderi |
| Rust-red stringy white rot | Echinodontium tinctorium |
| Sclerophoma dieback | Sydowia polyspora
Sclerophoma pythiophila [anamorph] = Sclerophoma semenospora [anamorph] |
| Snow blight | Phacidium abietis |
| Snow/needle blight | Phacidium infestans |
| Sparrasis root rot | Sparrasis crispa |
| Stringy butt rot | Perenniporia subacida |
| Swiss needle cast | Phaeocryptopus gaeumannii |
| Tomentosus root rot | Inonotus tomentosus |
| Upper stem canker | Phoma eupyrena
Fusarium avenaceum
Fusarium sambucinum |
| White stringy rot | Resinicium bicolor |