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Horizontal lines in bark

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From: Jesse Deckert
Neosho, WI
I've heard that when there are horizontal lines in the bark the tree's growth has slowed and it should be harvested. I was shown the lines on several 20+ dbh trees. Any truth to this?

Extension Message
From: Jay Hayek
Extension Specialist, Forestry
Department of Natural Resources and Environmental Sciences
Hi Jesse:

I'm going to assume you mean eastern black walnut (Juglans nigra) since this question was posted to the "All About Black Walnut" category.

I'm aware of the bark feature you speak of; however, I absolutely would not use that external feature as a guide to select which black walnut trees trees to mark for harvest. I don't know of any research or anecdotal evidence to back-up that claim.

Thanks for your question!

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