Re: Organic Pig Worming
Dr. H. Michael Simmons (firstname.lastname@example.org)
Mon, 23 Nov 1998 08:06:55 -0500 (EST)
Black walnut (Juglans nigra L.) produces juglone (5
hydroxy-1,4-napthoquinone), an allelopathic chemical present in all its
parts which is a respiration inhibitor that deprives sensitive plants of
energy for metabolic activity. Affected plants exhibit wilting, foliar
yellowing, and eventual death. The highest concentrations of the chemical
occur in the buds, nut hulls, and roots. Although related tree species
(e.g., butternut, English walnut, pecan, shagbark hickory, and bitternut
hickory) also produce the chemical, they produce much more limited
quantities than the black walnut and rarely affect other plant growth.
Plants sensitive to juglone include: cabbage, eggplant, pepper, potato,
tomato, apple, blackberry, blueberry, autumn crocus, peony, alfalfa,
crimson clover, and tobacco. I am unaware of any research that shows that
the chemical is harmful to humans or pigs.
H. Michael Simmons, Ph.D.
Community Garden Project
Bloomington Parks and Recreation
P.O. Box 848
Bloomington, IN 47402
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