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What to know about beech leaf disease, the ‘heartbreaking’ threat to forests along the East Coast

beech leaf

Topic: What to know about beech leaf disease, the ‘heartbreaking’ threat to forests along the East Coast

A mysterious parasitic worm that infests trees has experts concerned about forests along the East Coast. Beech leaf disease was the first detected in Ohio in 2012. How it got to the state is unclear, as is how it rapidly spread as far north as Maine, as far south as Virginia and to parts of all the states in between. It has also been found in Canada. Large numbers of foliar nematodes are the culprit behind the disease, which interferes with chlorophyll production and starves beech trees to death, according to the Providence Journal’s Alex Kuffner, part of the USA Today Network. The parasite, which is invisible to the naked eye, has also become more widespread in European cultivars often used for landscaping, including weeping beech, copper beech, fern-leaved beech and others. Considered a “foundational species” in northern hardwood forests and especially critical for black bears, American beech’s tall canopy and smooth gray trunk provides long-term habitat and sustenance for numerous types of birds, insects and mammals. The tree — which may live up to 400 years — produces a high-fat nut for bears and other animals to eat, a place for woodpeckers to forage, and homes for animals to nest and raise their young. “It’s heartbreaking,” University of Rhode Island plant scientist Heather Faubert told Kuffner. When diseased leaves are cut open and wet with a drop of water, thousands of nematodes are known to swim out, according to the Providence Journal. The worms overwinter in the long, cigar-shaped beech buds and attack leaves as they develop in the spring — which interrupts the tree leaves’ ability to photosynthesize and produce food. In the first year of infestation, the leaves will appear to have bands. By the second year, the leaves may be crinkled, thick and deformed, or they may not change in appearance at all. A previously healthy infested tree will often tap into its energy stores to generate a second round of smaller, thinner leaves, but it can only do this a few years in a row before it becomes depleted.

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Topic Discussed: What to know about beech leaf disease, the ‘heartbreaking’ threat to forests along the East Coast

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