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Dibotryon morbosum or Apiosporina morbosa is a plant pathogen, which is the causal agent of black knot. [1] [2] It affects members of the Prunus genus such as; cherry, plum, apricot, and chokecherry trees in North America. The disease produces rough, black growths that encircle and kill the infested parts, and provide habitat for insects.
One black locust leaf showing 13 leaflets. The roots of black locust contain nodules that allow it to fix nitrogen, as is common within the pea family.Trees reach a typical height of 12–30 metres (40–100 feet) with a diameter of 0.61–1.22 m (2–4 ft). [8]
Tree bark is corky and spongy. Black ash is a medium-sized deciduous tree reaching 15–20 metres (49–66 ft) (exceptionally 26 metres (85 ft)) tall with a trunk up to 60 cm (24 inches) diameter, or exceptionally to 160 cm (63 inches). The bark is grey, thick and corky even on young trees, becoming scaly and fissured with age. The winter buds ...
Burrs on a tree trunk in Norfolk, England. A burl (American English) or burr (British English) is a tree growth in which the grain has grown in a deformed manner. It is commonly found in the form of a rounded outgrowth on a tree trunk or branch that is filled with small knots from dormant buds. Burl formation is typically a result of some form ...
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 such as their roots or on the lower branches.
The Latin specific epithet nigra means "black", and refers to the deeply dark colour of the berries. [11] The English term for the tree is not believed to come from the word "old", but from the Anglo Saxon æld, meaning fire, because the hollow stems of the branches were used as bellows to blow air into a fire. [12]