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dablink|This article is about plant diseases. For other senses of this word, see blight (disambiguation) . Blight refers to a specific symptom affecting plant s in response to infection by a pathogenic organism . It is simply a rapid and complete chlorosis , browning, then death of plant Tissue (biology)|tissue s such as leaves, branches, twigs, or floral organs.Agrios, George N. Plant Pathology . 5th ed. Burlington, MA: Elsevier Academic Press, 2005. Accordingly, many diseases that primarily exhibit this symptom are called blights . Several notable examples are:
Phytophthora infestans|Late blight of potato , caused by the water mold Phytophthora infestans (Mont.) de Bary, the disease which led to the Great Irish Famine
Southern corn leaf blight, caused by the fungus Cochliobolus heterostrophus (Drechs.) Drechs, anamorph Bipolaris maydis (Nisikado & Miyake) Shoemaker, incited a severe loss of corn in the United States in 1970.Partridge, J.E. "Southern Corn Leaf Blight." 2003. 8 August 2006. http://nu-distance.unl.edu/homer/disease/agron/corn/CoSCLB.html
Chestnut blight , caused by the fungus Cryphonectria parasitica (Murrill) Barr, has nearly completely eradicated mature American chestnut s in North America.
Fireblight|Fire blight of pome fruits , caused by the bacterium Erwinia amylovora (Burrill) Winslow et al. , is the most severe disease of pear and also is found in apple and raspberry , among others.
Bacterial leaf blight of rice , caused by the bacterium Xanthomonas oryzae (Uyeda & Ishiyama) Dowson.Oda, M., Sekizawa, Y., and Watanabe, T. 1966. " Phenazine s as Disinfectants Against Bacterial Leaf Blight of the Rice Plant." Applied Microbiology 14(3):365-367.
Early blight of potato and tomato, caused by species of the ubiquitous fungal genus Alternaria
Leaf blight of the grasses
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.
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