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Beech bark disease is a disease that causes mortality and defects in beech trees in the eastern United States, Canada and Europe. [ 1 ] [ 2 ] [ 3 ] In North America , the disease occurs after extensive bark invasion by Xylococculus betulae and the beech scale insect , Cryptococcus fagisuga . [ 4 ]
Aleurodiscus oakesii on tree bark. Aleurodiscus oakesii is the most common fungi to cause “smooth patch disease” on the nonliving outer bark of trees. This fungal infection can lead to trees shedding and leaving smooth and lighter patches of bark on the tree, giving “smooth patch” its meaning.
Pages in category "Tree diseases" The following 33 pages are in this category, out of 33 total. ... Foamy bark canker; Forest pathology; H. Helicotylenchus dihystera;
Trees have natural chemicals that keep most fungi at bay, but climate change could be making trees more vulnerable, researcher says. Citizen scientists to study this tree disease found in ...
The tree reaches 10–15 metres (33–49 feet), rarely 25 m (82 ft), in height. The bark is usually very distinctive, unlike other junipers, hard, dark gray-brown, cracked into small square plates superficially resembling alligator skin; it is however sometimes like other junipers, with stringy vertical fissuring.
Alstonia scholaris is a glabrous tree and grows up to 40 m (130 ft) tall. Its mature bark is grayish and its young branches are copiously marked with lenticels.A unique feature of this tree is that in some places, such as New Guinea, the trunk is three-sided (i.e. it is triangular in cross-section).
It is caused by phytoplasmas which infect the phloem (inner bark) of the tree. [2] Similar phytoplasmas, also known confusingly as 'Elm yellows', also occur in Europe. [3] Infection and death of the phloem effectively girdles the tree and stops the flow of water and nutrients. The disease affects both wild-growing and cultivated trees.
The bark on young trees is smooth, grey, and with resin blisters (which tend to spray when ruptured), becoming rough and fissured or scaly on old trees. The leaves are flat and needle-like, 15 to 30 mm ( 5 ⁄ 8 to 1 + 1 ⁄ 8 in) long, dark green above often with a small patch of stomata near the tip, and two white stomatal bands below, and a ...
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