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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.
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.
This article is a list of diseases of black walnuts (Juglans nigra). Bacterial diseases. Bacterial diseases; ... Walnut bunch Phytoplasma organism White mold
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 ...
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.
Walnut (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]
Thousand cankers disease, which affects economically important black walnut (Juglans nigra) populations in North America, is caused by Geosmithia morbida. [3] Species in the genus are generally similar to those in Penicillium, but can be distinguished from them by forming cylindrical conidia from rough-walled phialides.
It is a plant pathogen infecting black walnut (Juglans nigra). It was first described as a species of Corticium by Christiaan Hendrik Persoon in 1797. Mordecai Cubitt Cooke transferred it to Peniophora in 1879. [1] It is found in Asia and North America. [2]
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