Oak Anthracnose

(Apiognomonia errabunda)

Conservation Status
Oak Anthracnose
 
  IUCN Red List

not listed

 
  NatureServe

not listed

 
  Minnesota

not listed

 
           
           
           
 
Description
 
 

Oak Anthracnose is a somewhat common but not especially harmful pest of oaks. It infects all oaks but is especially severe on white oak and bur oak. It appears in the spring and summer after a prolonged period of rainy, wet weather.

It first appears as irregular, water-soaked spots on young and wounded leaves of lower and inner branches. The spots soon turn black. When the spots dry out the infected part of the leaf is dead and turns tan or brown. Spots may coalesce into large brown areas. As leaf expansion continues around the dead or infected area, the leaf shape becomes deformed and often cupped.

An infection can cause complete defoliation but that is not fatal. Since the infection occurs early in the growing season, the tree will produce a second flush of leaves.

The fungus overwinters in leaf litter, on twigs and stems, and in cankers.

 
     
 

Similar Species

 
     
     
 
Habitat and Hosts
 
 

Oaks

 
     
 
Biology
 
 

Season

 
 

Spring and summer after wet weather

 
     
 
Distribution
 
 

Distribution Map

 

Sources

4, 7, 24, 26, 29, 30, 77.

Forest Insect and Disease Newsletter - Wet Summer 2017. Minnesota Department of Natural Resources

 
  6/19/2022      
         
 

Occurrence

 
 

Widespread and common

 
         
 
Taxonomy
 
  Kingdom Fungi (fungi)  
  Subkingdom Dikarya  
  Division Ascomycota (sac fungi)  
  Subdivision Pezizomycotina  
  Class Sordariomycetes  
  Subclass Sordariomycetidae  
  Order Diaporthales  
 

Family

Gnomoniaceae  
 

Genus

Apiognomonia  
       
 

Synonyms

 
 

Apiognomonia quercina

Apiognomonia tiliae

Discula umbrinella

Gloeosporidium tiliae

Gloeosporidium umbrinellum

Gloeosporium fagi

Gloeosporium fagi

Gloeosporium tiliae

Gloeosporium umbrinellum

Gnomonia errabunda

Gnomonia quercina

Gnomonia tiliae

Gnomonia veneta

Labrella fagi

Laestadia errabunda

Myxosporina fagi

Myxosporina tiliae

Sphaerella errabunda

Sphaeria errabunda

 
       
 

Common Names

 
 

Oak Anthracnose

 

 

 

 

 

 

 

 
 
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MinnesotaSeasons.com Photos
 
 

Oak Anthracnose on northern pin oak

 
    Oak Anthracnose   Oak Anthracnose  
           
    Oak Anthracnose   Oak Anthracnose  

 

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Other Videos
 
  Home Gardener - Oak Anthracnose
Hillside Garden Center
 
   
 
About

Uploaded on Jun 30, 2011

June 28th, 2011 - Every year different weather conditions allow for different diseases to flourish in plant populations. This year we have seen quite a few cases of Anthracnose in the Oak population. We take a look at where Anthracnose comes from and how to treat it.

   

 

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