This article is about plant diseases. For other uses, see Blight (disambiguation).

Blight refers to a specific symptom affecting plants in response to infection by a pathogenic organism. It is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs.[1] Accordingly, many diseases that primarily exhibit this symptom are called blights. Several notable examples are:

On leaf tissue, symptoms of blight are the initial appearance of lesions which rapidly engulf surrounding tissue. However, leaf spot may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms.

Blights are often named after their causative agent, for example Colletotrichum blight is named after the fungi Colletotrichum capsici, and Phytophthora blight is named after the water mold Phytophthora parasitica.[4]



  1. Agrios, George N. 2005. Plant Pathology. 5th ed, Burlington, MA: Elsevier Academic Press,
  2. Partridge, J.E. "Southern Corn Leaf Blight." 2003. 8 August 2006. "Archived copy". Archived from the original on 2010-07-23. Retrieved 2012-03-02.
  3. Oda, M., Sekizawa, Y., and Watanabe, T. 1966. "Phenazines as Disinfectants Against Bacterial Leaf Blight of the Rice Plant." Applied Microbiology 14(3):365-367.
  4. Chase, A. R. (1984). "Diseases of Foliage Plants - Revised List 1984". Agricultural Research Center - Apopka, University of Florida. Archived from the original on 30 October 2014.

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