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Juglans nigra, the eastern American black walnut, is a species of deciduous tree in the walnut family, Juglandaceae, native to central and eastern North America, growing mostly in riparian zones. Black walnut is susceptible to thousand cankers disease , which provoked a decline of walnut trees in some regions.
It is an isomer of lawsone, which is the active dye compound in the henna leaf. Juglone occurs naturally in the leaves, roots, husks, fruit (the epicarp), and bark of plants in the Juglandaceae family, particularly the black walnut (Juglans nigra), and is toxic or growth-stunting to many types of plants. [1]
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
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 ...
“Eastern Black Walnut Tree is a beautiful shade tree with a very unique dark side–its root system produces a natural herbicide that hinders the growth of other plants surrounding it,” says ...
flame lily, climbing lily, gloriosa lily, fire lily Colchicaceae: The plant is toxic enough to cause human and animal fatalities if ingested. Every part of the plant is poisonous, especially the tuberous rhizomes. As with other members of the Colchicaceae, this plant contains high levels of colchicine, a toxic alkaloid. It also contains the ...
0.01% Nicotine was reported from leaves, but identity of the plant was not certain; [66] claims of DMT and NMT in the plant [67] require verification or a proper reference Acacia rigidula 0.025% alkaloids from leaves, including N-methyl-phenethylamine and N-methyl-tyramine (both tentatively identified). [ 14 ]
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.