Disease Du Jour (July 8)

Today’s disease photo comes courtesy of Dr. Dale Pollet. This is foamy canker (or alcoholic flux), a disease that occurs on a number of tree species, but is most commonly seen on elm, oak, sweet gum and Victorian box. The white frothy, foam that is characteristic of this disease has a slightly alcoholic or fermentative odor and occurs only briefly during warm weather. The disease is presumably caused by bacteria or yeasts that invade cracks, holes or other injuries to the bark of trees where they grow. In some cases, the cambium beneath will be decayed as well. The only suggested treatment for this is to remove the bark from the affected area to expose it to the air and allow it to heal normally. In severe cases, the tree needs to be removed.  

White frothy exudate characteristic of foamy canker.


About Don Ferrin

I am an associate professor and extension specialist in the Department of Plant Patholgy & Crop Physiology with the LSU AgCenter in Baton Rouge. I have statewide responsibility for issues and educational programs related to diseases of all horticultural crops in Louisiana.
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1 Response to Disease Du Jour (July 8)

  1. Robert Turley says:

    A spray mix of 1 part Chlorox and 2 parts water, sprayed on and in the flux and foam areas thoroughly will clean up the bacteria and yeast infections so the bark can began to heal over the wound.

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