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  2. Tree topping - Wikipedia

    en.wikipedia.org/wiki/Tree_topping

    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 ...

  3. Raspberry leaf spot - Wikipedia

    en.wikipedia.org/wiki/Raspberry_leaf_spot

    A raspberry leaf spot infection initially causes dark green circular spots on the upper side of young leaves, which will eventually turn tan or gray. [3] These spots are typically 1–2 millimetres (0.039–0.079 in) in diameter, but can get as big as 4–6 millimetres (0.16–0.24 in). [4] These spots can also fall out, causing a shot effect.

  4. Boxwood blight - Wikipedia

    en.wikipedia.org/wiki/Boxwood_blight

    The blight initially presents as dark or light brown spots or lesions on leaves. The leaves typically turn brown or straw color, then fall off. [10] The stems develop dark brown or black lesions. [11] The disease is often fatal to young plants. The spores remain viable for five years in fallen boxwood leaves, [12] and are dispersed by wind and ...

  5. Pollarding - Wikipedia

    en.wikipedia.org/wiki/Pollarding

    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 ...

  6. Leaf spot - Wikipedia

    en.wikipedia.org/wiki/Leaf_spot

    Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]

  7. Pruning - Wikipedia

    en.wikipedia.org/wiki/Pruning

    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 .

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