In 2020, beech leaf disease was identified in Bergen and Essex counties, responsible for the gradual deforestation of our communities; today the NJDEP reports the disease has been identified in an additional 10 counties.
Beech leaf disease was first detected in Bergen and Essex counties in summer 2020 and is now confirmed in 10 additional counties.
Beech leaf disease is an emerging forest health threat impacting native and ornamental beech trees, including American, European, and Oriental beech in the Northeast.
Initial visible symptoms are dark bands between leaf veins, which are best seen when holding a leaf up to a light source.
At first, symptoms may only be present on a few leaves within a single branch, making initial detection difficult.
As the disease progresses, more leaves become affected and additional symptoms, including browning leaf edges that begin to curl, leathery leaf texture, and early defoliation, may become apparent. Eventually, tree mortality will occur.
“The threat of losing yet another native tree species from our forests within a short period of time can exacerbate an already strained system that struggles with other stressors such as invasive plants, deer herbivory, drought, flooding and climate change,” said State Forester John Sacco. “We are experiencing the widespread loss of ash trees due to the emerald ash borer along with both the historic losses of American chestnut from chestnut blight and American elm from Dutch elm disease. Through individual observation and research, we can better understand beech leaf disease and work to keep beech trees in our forests and yards.”
Smaller understory beech trees appear to be most susceptible to beech leaf disease, but beech trees of all size classes can be affected.
The disease is progressive and causes severe decline to a tree’s health before the tree eventually succumbs, generally within two to seven years.
To date, beech leaf disease has been observed in Bergen, Burlington, Essex, Hunterdon, Mercer, Monmouth, Morris, Passaic, Somerset, Sussex, Union, and Warren counties.
Residents with questions or suspected beech leaf disease outside the aforementioned counties may contact the New Jersey Forest Service’s Forest Health Program by emailing email@example.com or calling (609) 292-2532.
Beech leaf disease was discovered in 2012 in Ohio. Its full cause and mechanism of spread remain unknown.
Symptoms are associated with a newly recognized subspecies of the anguinid nematode (Litylenchus crenatae mccannii), which is a non-segmented, microscopic worm.
Nematode infection mechanisms are not fully understood, but research indicates that the nematode is associated with buds and leaves of affected beech trees.
There is no known treatment for beech leaf disease, but research is ongoing. Best management practices, such as following Don’t Move Firewood guidelines and monitoring healthy beech trees in landscapes and forests, may be the best defense until beech leaf disease is better understood.
The New Jersey Forest Service is helping to support research efforts by establishing 12 long-term monitoring plots to measure and track beech leaf disease across New Jersey. This is part of a collaborative multi-state effort to collect data in hopes to detect trends and better understand beech leaf disease progression.
Beech is an important species within the hardwood forests of northern New Jersey. The USDA Forest Service’s Forest Inventory and Analysis Program estimate there to be more than 1.1 million metric tons of carbon stored within an estimated 12 million beech trees throughout New Jersey. Losing these trees would result in the release of stored carbon into the atmosphere as the trees decompose, contributing to the greenhouse gas emissions that cause climate change, as well as future loss of ongoing carbon sequestration.
Beech leaf disease is one of the many threats to New Jersey’s forests. American beech trees have previously been impacted by beech bark disease, which was first detected in New Jersey in the mid-1970s. American beech trees seen today are survivors of beech bark disease but do not appear to fare as well with beech leaf disease.
Additional forest health threats detected in New Jersey that pose the greatest threat include emerald ash borer, bacterial leaf scorch, spongy moth (formerly known as gypsy moth), jumping worms, southern pine beetle, and current drought conditions.
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