Black Walnut Trees Produce A Natural Insecticide

Marilyn Pokorney

The black walnut tree manufactures a substance that is a natural insecticide according to experts at the Texas State University in Austin. American black walnut tress contain a tannic acid chemists call juglone. The reddish yellow substance leaches from leaves, and some believe exudes from roots, or transfers from branches and foliage to the roots. Tree physiologists agree that roots of other plants that come in contact with those black walnut tree roots die--even other black walnut seedlings. Juglone is sometimes washed out of the still green walnuts during late summer or even autumn rains.

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