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The P&PDL Picture of the Week



Oak Anthracnose

Gail Ruhl, Senior Plant Disease Diagnostician,
Department of Botany and Plant Pathology

(Click on smaller image to view larger image.)

Photos by Gail Ruhl.

Oak Anthracnose Oak Anthracnose Close-up of Oak Anthracnose
Oak Anthracnose Infected Leaves Close-up of Oak Leaf Infected with Oak Anthracnose

Have you noticed any tannish-brown, irregular, discoloration on white oak leaves that appears to be occur along the midribs and veins and extends to the leaf margins? If so, you may be observing a fungal disease known as Oak anthracnose. This disease is caused by the fungus Apiognomonia quercina. The disease is most common on lower branches, following cool, wet, spring weather. The necrotic foliar tissue may cause leaf distortion. It is also possible for twigs to become infected, causing cankers and twig dieback.

Although we can't control the weather, there are some cultural practices that may help anthracnose management in landscape trees.

Please refer to pp 6-7 in BP-63 "Common Tree Diseases of Indiana" for a more thorough description of anthracnose of shade trees.


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Last updated: 2 July 2001/tlm.
The Plant & Pest Diagnostic Laboratory at Purdue University.