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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.
In 1926, instances of apple tree damage caused by both Juglans nigra and Juglans cinerea (butternut) trees were reported in northern Virginia. [4] Certain apple tree varieties displayed varying levels of resistance to walnut toxicity. In 1926, it was observed that walnut trees in alfalfa fields resulted in crop death, while grass remained ...
Walnut bunch Phytoplasma organism White mold Microstroma juglandis: White trunk rot Phellinus igniarius: Wood decay Schizophyllum commune Hypochnicium vellereum Trametes versicolor Phellinus gilvus Peniophora cinerea Hericium coralloides. Zonate leaf spot Grovesinia pyramidalis
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.
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 ...
Geosmithia morbida is a species of anamorphic fungus in the Bionectriaceae family that, together with the activity of the walnut twig beetle, causes thousand cankers disease in species of walnut trees (Juglans spp.). [1] It was described as new to science in 2010 from specimens collected in the southern United States.
Walnut trees are any species of tree in the plant genus Juglans, the type genus of the family Juglandaceae, the seeds of which are referred to as walnuts.All species are deciduous trees, 10–40 metres (33–131 ft) tall, with pinnate leaves 200–900 millimetres (7.9–35.4 in), with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnuts (Pterocarya), but not ...
Allelopathic interactions are an important factor in determining species distribution and abundance within plant communities, and are also thought to be important in the success of many invasive plants. For specific examples, see black walnut (Juglans nigra), tree of heaven (Ailanthus altissima), black crowberry (Empetrum nigrum), spotted ...