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Beech leaf disease is a newly discovered lethal disease of beech trees believed to be caused by the nematode Litylenchus crenatae mccannii. [1] The symptoms of the disease appear as a dark green, interveinal banding pattern on the lower canopy foliage, eventually spreading throughout the tree.
Litylenchus crenatae mccannii is a newly recognized nematode subspecies believed to be the cause of beech leaf disease. [2] [3] References
The disease has torn through a dozen states in little more than a decade, caused by a type of microscopic worm called a foliar nematode that eats the leaves of beech trees.
The USDA’s Animal and Plant Health Inspection Service, or APHIS, has allocated more than $108,000 for a research project studying the risks of beech leaf disease in several states.
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 ]
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The leaves of beech trees are entire or sparsely toothed, from 5–15 centimetres (2–6 inches) long and 4–10 cm (2–4 in) broad. The bark is smooth and light gray. The fruit is a small, sharply three-angled nut 10–15 mm ( 3 ⁄ 8 – 5 ⁄ 8 in) long, borne singly or in pairs in soft-spined husks 1.5–2.5 cm ( 5 ⁄ 8 –1 in) long ...
Two of my favorite spring plants, almost entirely based upon their progression from bud to leaf, are beech trees and false hellebore.