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Various cultivars of Salix matsudana (Chinese willow) are now often included within Salix babylonica, treated more broadly, including: 'Pendula' is one of the best weeping trees, with a silvery shine, hardier, and more disease resistant. 'Tortuosa' is an upright tree with twisted and contorted branches, marketed as corkscrew willow.
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. Early signs of the disease are wilting or dried-out, dead leaves on intermittent branches throughout the tree's crown.
The fungus forms perennial fruiting bodies that rise as woody-hard, hoof or disc-shaped brackets from the bark of the infested living tree or dead log. The tree species is often willow but it may be commonly found on birch and alder and other broad leafed trees. The top is covered with a dark, often cracked crust, a stem is present only in its ...
Black willows are susceptible to diseases such as crown gall and cankers. Crown gall is caused by bacteria living in the soil where the black willow is present. When black willow are infected, the bacteria stimulate a quick burst in growth of plant cells. They cause the tree to form tumor-like growths, or "galls" on different parts of the tree ...
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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. The stems are straight and support few branches ...
Hypoxylon canker of shade trees is an ascomycete fungal disease. [7] [8] The fungal pathogen must take advantage of wounds in the host tree or unhealthy tree tissue to infect and colonize the host, as normal, robust trees are not very susceptible to infection. [7]
Salix × fragilis is cultivated as a fast-growing ornamental tree. The cultivar 'Russelliana' (syn. S. × fragilis var. russelliana) is by far the most common clone of crack willow in Great Britain and Ireland, very easily propagated by cuttings. It is a vigorous tree commonly reaching 20–25 m (66–82 ft) tall, with leaves up to 15 cm long.