This article is a list of diseases of flax (Linum usitatissimum and other Linum spp.).
| Fungal diseases | |
|---|---|
| Anthracnose | Colletotrichum lini |
| Basal stem blight | Phoma spp. Phoma exigua var. linicola |
| Brown stem blight | Alternaria linicola |
| Browning (and) stem break | Aureobasidium lini Guignardia fulvida [teleomorph] |
| Damping-off, root rot, and seedling blight | Alternaria spp. Colletotrichum lini Fusarium spp. Pythium spp. Rhizoctonia solani Thanatephorus cucumeris [teleomorph] Thielaviopsis basicola Chalara elegans [synanamorph] |
| Dieback | Selenophoma linicola |
| Pasmo | Septoria linicola Mycosphaerella linicola [teleomorph] |
| Rust | Melampsora lini Melampsora lini var. lini |
| Stem mold & rot | Sclerotinia sclerotiorum |
| Wilt | Fusarium oxysporum f.sp. lini |
| Virus and mycoplasmalike organism (MLO) diseases | |
|---|---|
| Phytoplasma | |
| Crinkle | |
| Miscellaneous diseases or disorders | |
|---|---|
| Boll blight | Extreme high temperatures |
| Chlorosis | Alkaline and very wet soils; mineral deficiencies; herbicide damage |
| Extreme high or low temperatures cause cankers at soil level | |
| Stem twisting and bending | Herbicide damage and soil and temperature conditions |