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Black walnut is susceptible to thousand cankers disease, which provoked a decline of walnut trees in some regions. Black walnut is allelopathic, releasing chemicals from its roots and other tissues that may harm other organisms and give the tree a competitive advantage, but there is no scientific consensus that this is a primary competitive factor.
The allelopathic effects of walnut trees on other plants were observed as far back as the 1st century CE. [2] Juglone itself was first isolated from black walnut in 1856, and was identified as the compound responsible for its allelopathic effects in 1881.
Plants can cause reactions ranging from laminitis (found in horses bedded on shavings from black walnut trees), anemia, kidney disease and kidney failure (from eating the wilted leaves of red maples), to cyanide poisoning (from the ingestion of plant matter from members of the genus Prunus) and other symptoms.
Myth: You Can't Grow Anything Near a Black Walnut Tree. Truth: While the roots of black walnut (Juglans nigra) do release an allelopathic chemical known as juglone that inhibits the growth of some ...
Leaf spot Mycosphaerella juglandis Cylindrosporium juglandis [anamorph] Nectria canker Nectria galligena: Phytophthora root rot Phytophthora citricola Phytophthora cinnamomi. Seedling shoot dieback Phomopsis arnoldiae = Phomopsis elaeagni. Thousand cankers disease: Geosmithia fungus Walnut bunch Phytoplasma organism White mold Microstroma juglandis
Thousand cankers is a recently described disease and its involvement in tree mortality apparently is also recent. The first published note involving black walnut die-offs that likely can be attributed to TCD occurred in the Espanola Valley of northern New Mexico in 2001.
The plant's toxicity has led to the U.S. FDA officially declaring it to be unsafe. Arum maculatum: cuckoo-pint, lords and ladies, jack-in-the-pulpit, wake robin, wild arum, devils and angels, cows and bulls, Adam and Eve, bobbins, starch-root Araceae: All parts of the plant are highly toxic to humans and most animals.
Juglans hindsii, commonly called the Northern California black walnut and Hinds's black walnut, is a species of walnut tree native to the western United States (California and Oregon). [ 1 ] [ 2 ] [ 3 ] It is commonly called claro walnut by the lumber industry and woodworkers, and is the subject of some confusion over its being used as ...