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Canker (or anthracnose) is
a general terms used to indicate a large number of different plants
diseases that causes localized necrotic lesion to the bark, root,
stem or branch. |
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Cankers is an imprecise term for a number of
different plant diseases characterised by broadly similar
symptoms: the appearance of small discoloured, often
sunken areas of dead tissue arising (in woody plants) from the
death of cambium tissue outside the xylem cylinder or (in
non-woody plants) by the formation of sharply delineated, dry,
necrotic, localized lesions on the stem.
Cankers usually grow slowly, often over a period of years, but
sometimes limited in extent by host reactions which can result
in more or less massive overgrowth of surrounding tissues.
Some cankers are of only minor consequence, but others are
ultimately lethal, and of major economic importance in
agriculture and horticulture. Canker causing organisms sometimes
exist in some sort of a balance with the host, never killing
enough tissue to cause death. Cankers tend to weaken plants at
the points where they are growing causing the plant to
eventually break.
Different cankers and anthracnoses are caused by a wide range of
pathologic organisms, including fungi, bacteria,
mycoplasmas and
viruses. |
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