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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.
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 ...
Until July 2010 the disease was only known to the western United States where over the past decade it has been involved in several large scale die-offs of walnut, particularly black walnut, Juglans nigra. However, in late July 2010 a well-established outbreak of the disease was found in the Knoxville, Tennessee, area.
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(Juglans regia) Black walnut (Juglans nigra) J. regia originated in south eastern Europe, western/central Asia, and J. nigra originated in the eastern United States. The fruit is a pseudo-drupe with a green, semi-fleshy husk. [5]
This article is a list of diseases of black walnuts (Juglans nigra). Bacterial diseases. Bacterial diseases; Bacterial blight Xanthomonas juglandis: Fungal diseases
Image Genus Living species Cyclocarya Iljinsk.: Cyclocarya paliurus - wheel wingnut; Juglans L.: J. ailantifolia Carr. – Japanese walnut; J. mandshurica Maxim. – Manchurian walnut or Chinese walnut
Family Juglandaceae, genus Juglans sect. Rhysocaryon: Juglans nigra, the eastern black walnut, a species of flowering tree native to eastern North America. Juglans californica, California black walnut or Southern California black walnut. Juglans hindsii, the Northern California walnut or Hinds' black walnut. Juglans major, Arizona black walnut.