Blight commonly refers to:
- Potato blight:
Blight may also refer to:
- Alternaria leaf blight, a condition of cucurbits caused by the ascomycete fungus Alternaria cucumerina.
- Black potato blight, caused by Phoma andigena a fungal pathogen of potatoes only found at altitude in Peru.
- Blossom blight or sclerotinia rot, a genus of fungi with numerous plant pathogenic taxa.
- Corynespora blight, caused by the plant pathogen Corynespora cassiicola. Also known as "target spot".
- Gummy stem blight, caused by Didymella bryoniae a fungal plant pathogen, which attacks mature plants. A sunken brown canker appears at the base of the stem.
- Halo blight, caused by Pseudomonas amygdali pv. phaseolicola a bacterial blight disease in legumes.
- Pantoea bacterial blight, better known as bacterial brown spot, caused by the Gram-negative bacteria Pantoea ananatis
- Phoma blight, caused by one of the Phoma species of about 140 taxa of plant pathogenic species including P. exigua var. foveata (Gangrene) and P. terrestris (Pink root of onion).
- Phomopsis blight, caused by Phomopsis a genus of canker-producing plant pathogens.
- Rhizoctonia blight, caused by Rhizoctonia solani a plant pathogenic fungus with a wide host range and worldwide distribution.