black stain and small slice wound on oak tree

Asked July 8, 2014, 3:44 PM EDT

looks like tree blew small slit open and oozed black tar out. What could this be and what to do?

Lincoln County South Dakota trees and shrubs

1 Response

This may be a bleeding canker disease. There are bacterial and fungal organisms that can cause this problem. Knowing the tree species can help determine which plant pathogen it is. I would recommend you contact your local Iniversisty Extension office for further information on this problem. A sample may be taken and disease organism diagnosed through your Univeristy Extension Plant Pathology lab.
Paula Dinius, Urban Horticulturist
WSU Extension