removing mold from tree trunks - Knowledgebase Question

apollo, Pe
Question by dlray941
April 2, 2010
we have lived here for 8 1/2 years & for some reason this year most of our large oak tress & some cherry & apple trees have mold on the base of their trunks any reason why or how to remove thank u, d

Answer from NGA
April 2, 2010


Is it green mold or is it black slime? It makes a difference. Green mold can just indicate a wet winter and you can kill it with a spray of lime/sulfur (Bordeaux) or a copper based fungicide. If it is black, it could indicate a disease which is causing sap to flow from the bark of the tree. You may want to take close up pictures of the problem areas and show them to the staff at your local cooperative extension office for positive diagnosis. Contact Penn State University Cooperative Extension, 124 Armsdale Road, Kittanning, PA 16201 phone (724) 548-3447. Good luck with your trees.

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