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Date Posted: 10:19:41 08/23/07 Thu
Author: Bobbie
Subject: Re: Walnuts
In reply to: S. K. Dixon 's message, "Walnuts" on 09:58:00 08/23/07 Thu

I'm thinking you are asking about the outer covering, a "husk" I think it is called. I wish I could help with an answer but don't know for sure. Logic would say that flyers are exposed to the unhusked walnuts in nature but I cannot say how a domesticated flyer would respond to something she had never seen before and therefore had no past natural judgement to react with. I found an article that says; "The causal agent is a chemical called “juglone” (5 hydroxy-1,4-napthoquinone), which occurs naturally in all parts of the black walnut. Juglone has experimentally been shown to be a respiration inhibitor which deprives sensitive plants of needed energy for metabolic activity." This article is from Purdue University and refers to the plant life growing around the tree that dies. It does not answer the question of how it effects animals. I also find that I cannot eat the black walnut but can eat the "English" walnut, go figure. BTW the website is
http://www.ces.purdue.edu/extmedia/HO/HO-193.pdf

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