This article is a list of diseases of Douglas-fir (Pseudotsuga menziezii).
| 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 | |