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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.
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 ]
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.
Litylenchus crenatae mccannii is a newly recognized nematode subspecies believed to be the cause of beech leaf disease. [2] [3] References
Lingering trees may hold the key to the survival of New York's forests in the face of insects and disease.
The European beech (Fagus sylvatica) is the most commonly cultivated, although few important differences are seen between species aside from detail elements such as leaf shape. 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.
Fagus grandifolia is a large deciduous tree [6] growing to 16–35 metres (52–115 feet) tall, [7] with smooth, silver-gray bark.The leaves are dark green, simple and sparsely-toothed with small teeth that terminate each vein, 6–12 centimetres (2 + 1 ⁄ 4 – 4 + 3 ⁄ 4 inches) long (rarely 15 cm or 6 in), with a short petiole.