Tree Cankers

We have a huge oak that has apparently lost a large branch on the side of the trunk. It looks like a canker, although I see no fungus. What can I put on the open area to seal the wound?

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1 Comment To "Tree Cankers"

#1 Comment By Nikki On 05/05/2011 @ 12:42 pm

This article should help: https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-disease-identification-sooty-canker-fungus.htm ^[1]

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