North Carolina State University


Contents (this page):
General Info
Anthracnoses of:
Ash
Dogwood (spot anthracnose)

Dogwood (dogwood anthracnose)

Elm

Sycamore

Maple

Birch

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Foliar Diseases of Hardwoods
Plant Disease Profiles
Related Links
Glossary
PP318 Home

Anthracnose Diseases of Hardwood Trees
Ash anthracnose
Dogwood spot anthracnose

Anthracnose is a disease of  leaves, succulent 
stems or fruit with a characteristic, limited, sunken, 
necrotic lesion or canker. 



 
      Generally, anthracnose diseases are caused by fungi that produce acervuli (sing.= acervulus) (Deuteromycota).  For some of these fungi the sexual stage is known and two scientific names are available.  Many of these fungi were formally classified in the genus Gloeosporium. acervulus

Common Anthracnose Diseases in the Southeast U.S.
Host Pathogen
Ash Discula fraxinea
Dogwood Elsinoe corni (spot anthracnose)
Discula destructiva (dogwood anthracnose)
Sycamore Discula platani
Maple Aureobasidium apocryptum
Elm Asteroma ulmeum
River birch Cryptocline betularum


Ash Anthracnose Caused by Discula fraxinea

Ash anthracnose
necrotic leaflets

Note the necrotic leaflets and blotching


Spot Anthracnose of Dogwood Caused by Elsinoe corni

spot anthracnosenote purplish spots

Note the purplish spots on the flowers and leaves.


note spots on fruit

The disease also causes spots to form on the fruit.


Dogwood Anthracnose Caused by Discula destructiva 

distribution of dogwood anthracnose

Distribution of dogwood anthracnose in the southeastern U.S. 
Blue indicates counties which had reports of D. destructiva prior to 1998 
Red indicates counties which have reported D. destructiva since 1998


leafspot
In addition to necrosis and leaf spots, Discula destructiva infection results in the formation of a canker on the stem of the tree and eventually tree mortality.
leafspot
formation of canker on the stem


acervuli
spore tendrils

Spores of the fungus form in acervuli (left). 
             When mature they may be produced in a spore tendril (also called a cirrhus).
Click here for additional details on dogwood anthracnose.



Elm Anthracnose Caused by Asteroma ulmeum

leafspot and chlorosis on elm

Note the leaf spots and chlorosis on the leaves.


Sycamore Anthracnose Caused by Discula platani

defoliation
necrosis of leaves

Symptoms of this disease are defoliation and necrosis.
 
note bud blasting and canker on stem

In addition to foliage symptoms, D. platani causes bud blasting and cankering on the stem.


Maple Anthracnose Caused by Aureobasidium apocryptum

necrosis of maple leaf

Note the necrosis following the major veins into the center of the leaf.


Birch Anthracnose Caused by Cryptocline betularum

leafspot and chlorosis of birch

Note the limited leaf spots and the chlorosis.  Defoliation is common. 
 

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This web site was prepared by Becky Bernard.
Last updated on 04 February 2008 by M.J. Munster