Blight commonly refers to:

  • Potato blight:
    • Late blight, caused by Phytophthora infestans an oomycete or water mold that causes the serious potato disease
    • Early blight, caused by Alternaria solani a fungal pathogen, producing a disease in tomato and potato plants

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.

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