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Large pruning wounds, such as those left behind in trees after topping, may become entry points for pathogens and may result in extensive decay. Decay undermines, to greater or lesser extent, the long-term health and physical stability of trees; most notably in those species which compartmentalize decay less effectively. Should a tree survive ...
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.
Topping: Topping is a very severe form of pruning which involves removing all branches and growths down to a few large branches or to the trunk of the tree. When performed correctly it is used on very young trees, and can be used to begin training younger trees for pollarding or for trellising to form an espalier .
Some trees may be rejuvenated by pollarding – for example, Bradford pear (Pyrus calleryana 'Bradford'), a flowering species that becomes brittle and top-heavy when older. [ citation needed ] Oaks, when very old, can form new trunks from the growth of pollard branches; that is, surviving branches which have split away from the main branch ...
The fruit is a small black drupe 3 millimetres (0.12 in) diameter, and may be toxic to humans. [3] In the wild, the plant achieves a height of 1.2 to 1.8 metres (3.9 to 5.9 ft). [5] [6] It has golden leaves in the spring and an abundance of large bright green ones in the summer. [7]
All oak trees may display foliage marcescence, even species that are known to fully drop leaves when the tree is mature. [7] Marcescent leaves of pin oak (Quercus palustris) complete development of their abscission layer in the spring. [8] The base of the petiole remains alive over the winter. Many other trees may have marcescent leaves in ...
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