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Blight refers to a specific symptom
Symptom

A symptom is a departure from normal function or feeling which is noticed by a patient, indicating the presence of disease or abnormality. A symptom is subjective, observed by the patient, and not measured....
 affecting plant
Plant

Plants are Life organisms belonging to the Kingdom Plantae. They include familiar organisms such as trees, herbs, bushes, grasses, vines, ferns, mosses, and green algae....
s in response to infection by a pathogenic organism
Organism

In biology, an organism is any life thing . In at least some form, all organisms are capable of response to stimulus , reproduction, growth and developmental biology, and maintenance of homeostasis as a stable whole....
. It is simply a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs. 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.






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Blight refers to a specific symptom
Symptom

A symptom is a departure from normal function or feeling which is noticed by a patient, indicating the presence of disease or abnormality. A symptom is subjective, observed by the patient, and not measured....
 affecting plant
Plant

Plants are Life organisms belonging to the Kingdom Plantae. They include familiar organisms such as trees, herbs, bushes, grasses, vines, ferns, mosses, and green algae....
s in response to infection by a pathogenic organism
Organism

In biology, an organism is any life thing . In at least some form, all organisms are capable of response to stimulus , reproduction, growth and developmental biology, and maintenance of homeostasis as a stable whole....
. It is simply a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs. Accordingly, many diseases that primarily exhibit this symptom are called blights. Several notable examples are:
  • Late blight of potato
    Phytophthora infestans

    Phytophthora infestans is an oomycete that causes the serious potato disease known as late blight or potato blight. . It was a major culprit in the Irish Potato Famine and Highland Potato Famine potato famines....
    , caused by the water mold Phytophthora infestans
    Phytophthora infestans

    Phytophthora infestans is an oomycete that causes the serious potato disease known as late blight or potato blight. . It was a major culprit in the Irish Potato Famine and Highland Potato Famine potato famines....
     (Mont.) de Bary, the disease which led to the Great Irish Famine
  • Southern corn leaf blight, caused by the fungus
    Fungus

    A fungus is a Eukaryote organism that is a member of the Kingdom Fungi . The fungi are a monophyletic group, also called the Eumycota , that is phylogeny distinct from the morphologically similar slime molds and water molds ....
     Cochliobolus heterostrophus
    Cochliobolus heterostrophus

    Cochliobolus heterostrophus is a Fungus Plant pathology. It can cause list of maize diseases in Maize....
     (Drechs.) Drechs, anamorph Bipolaris maydis (Nisikado & Miyake) by the bacterium Erwinia amylovora (Burrill) Winslow et al., is the most severe disease of pear
    Pear

    The pear is an edible pome fruit produced by a tree of genus Pyrus . The pear is classified within Maloideae, a subfamily within Rosaceae. The apple , which it resembles in floral structure, is also a member of this subfamily....
     and also is found in apple
    APPLE

    This article is about the satellite APPLE. For the fruit apple, see Apple. For other uses see Apple .The Ariane Passenger PayLoad Experiment , was an experimental communication satellite with a C-Band transponder launched by Indian Space Research Organisation satellite on June 19, 1981 by Ariane 1, a launch vehicle of the European Spac...
     and raspberry
    Raspberry

    The raspberry is the edible fruit of a multitude of plant species in the subgenus Rubus#Scientific classification of the genus Rubus; the name also applies to these plants themselves....
    , among others.
  • Bacterial leaf blight of rice
    Rice

    Rice is a staple food for a large part of the world's human population, especially in tropical Latin America, and East Asia, South Asia and Southeast Asia, making it the second-most consumed cereal grain, after maize....
    , caused by the bacterium Xanthomonas oryzae
    Xanthomonas oryzae

    Xanthomonas oryzae is a species of proteobacteria. The major host of the bacteria is rice .The species contains two pathovars which are non-European: Xanthomonas oryzae pv....
     (Uyeda & Ishiyama) Dowson.
  • Early blight of potato and tomato, caused by species of the ubiquitous fungal genus Alternaria
    Alternaria

    Alternaria is a genus of Ascomycota fungi. Alternaria species are known as major Phytopathology. They are also common allergens in humans, growing indoors and causing hay fever or hypersensitivity reactions that sometimes lead to asthma....
  • 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
Leaf spot

Leaf Spots are round blemishes found on the Leaf of many species of plants, mostly caused by parasitic fungi or bacteria.A typical spot is "zonal", meaning it has a definite edge and often has a darker border....
 may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms.