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Contents (this page):
Overview
Distribution
Symptoms
Signs
Back to:
Anthracnose Diseases
Foliar Diseases of Hardwoods
Plant Disease Profiles
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Glossary
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Dogwood Anthracnose
Dogwood is used extensively as a landscape
plant both for its flowers and fall colors.
Dogwood in its natural habitat adds to
the spring and fall seasons and its fruit is utilized by a
variety of wildlife including several species
of birds, squirrels, deer and bear.
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In the late 1970s a disease, later named
dogwood anthracnose, was reported in Oregon and Washington on Pacific flowering
dogwood (left) and on flowering dogwood (right) in the northeastern U.S.
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In 1987 (Georgia) and 1989 (NC) the disease
was reported in the Southern Appalachians and the Great Smoky Mountain
National Forest. Dogwood anthracnose is caused by the fungus Discula
destructiva Redlin. |
Dogwood anthracnose distribution United States
and Canada - 1994
The blue signifies
the range of flowering dogwood and the green signifies the
range of pacific dogwood.
The red signifies dogwood anthracnose occurrence.
Dogwood anthracnose distribution Southeastern
U.S. - 1994
Green signifies confirmation of dogwood anthracnose
prior to 1994,
and red signifies confirmation in 1995.
Symptoms
of Dogwood Anthracnose
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Initial symptoms may be a leaf spot or
a blotch on the margin or internal portion of the leaf; leaf necrosis soon
follows.
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Eventually the fungus grows into the
twigs causing a sparse crown and dieback.
A canker develops as the fungus colonizes
the cambium of larger branches
and stems, eventually killing the tree.
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Water sprouts (sprouts from adventitious
buds) are induced around the canker. These sprouts are very susceptible
to infection.
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This is spot anthracnose on dogwood -
not to be confused with dogwood anthracnose.
This fungus does not get into the woody portions
of the tree but remains in the leaf.
Signs
of Dogwood Anthracnose
Acervuli are produced on infected leaves
and twigs. Spore tendrils may also be produced. Acervuli produced on dead
overwintered twigs and leaves serve as inoculum in the spring.
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Conidia of Discula destructiva
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This website was prepared by Becky Bernard.
Last updated on 04 February 2008 by M.J. Munster
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