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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] It is sometimes used as an herbicide, as a dye for cloth and inks, and as a coloring agent for foods and cosmetics.
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 ...
When complete, the list below will include all food plants native to the Americas (genera marked with a dagger † are endemic), regardless of when or where they were first used as a food source. For a list of food plants and other crops which were only introduced to Old World cultures as a result of the Columbian Exchange touched off by the ...
Deciduous shrubs and trees with unisexual flowers and loose bark, usually with lenticels, horizontal ruptures that allow gas exchange. The wood of birch and alder is used to make furniture and musical instruments. [19] [33] Fagales [33]
Walnut (Juglans) Eastern black walnut (Juglans nigra) Common walnut (Juglans regia) Wenge (Millettia laurentii) Panga-panga (Millettia stuhlmannii) Willow (Salix) Black willow (Salix nigra) Cricket-bat willow (Salix alba 'Caerulea') White willow (Salix alba) Weeping willow (Salix babylonica) Zingana, African zebrawood (Microberlinia ...
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Instead, in TCD the bark remains firmly attached to the canker face making the necrotic areas very difficult to observe. Branch cankers usually are not visible until the outer bark is shaved to expose the beetle tunnels, although during late stages of the disease a dark amber stain may form on the bark surface in association with the cankers.