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Salix discolor, the American pussy willow [2] or glaucous willow, [3] is a species of willow native to North America, one of two species commonly called pussy willow.. It is native to the vast reaches of Alaska as well as the northern forests and wetlands of Canada (British Columbia east to Newfoundland), and is also found in the northern portions of the contiguous United States (Washington ...
Brenneria salicis is a Gram-negative bacterium that is pathogenic on plants.. The bacterium is known to cause 'watermark disease' in willow (Salix ssp.) trees.Watermark disease affects infected trees by occluding the xylem vessels, impeding circulation.
Pussy willow is a name given to many of the smaller species of the genus Salix (willows and sallows) when their furry catkins are young in early spring. These species include (among many others): Goat willow or goat sallow (Salix caprea), a small tree native to northern Europe and northwest Asia.
A pathogen may slowly weaken a tree (beech bark disease) or it may cause rapid decline (chestnut blight). A pest may attack a specific species (hemlock woolly adelgid) or it may attack several species (emerald ash borer) or species across many genera (Asian long-horned beetle). [10] The impacts to the forest also differ depending on ...
Salix cinerea seeds on a birch tree branch. Grey willow grows in wetlands, moist depressions, ditches, embankments, banks of stagnant or slow-moving water bodies, and forest edges, where it encounters low-lying damp situations with waterlogged and nutrient-poor soils. S. cinerea is a pioneer species that rapidly colonizes disturbed sites. [8]
Salix scouleriana seed. Salix scouleriana is a deciduous shrub or small tree, depending on the environment, usually with multiple stems that reach 2 to 7 metres (6 + 1 ⁄ 2 to 23 ft) in height in dry, cold, high elevations, and other difficult environments, and 10 to 20 m (33 to 66 ft) or more in favorable sites.
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Salix caprea, known as goat willow, pussy willow or great sallow, ... It is a deciduous shrub or small tree, reaching a height of 8–10 m (26–33 ft), ...