Beech Leaf Disease - July 2025
Beech leaf disease (BLD) is an emerging plant pathogen responsible for the decline and mortality of native and introduced beech trees. It is associated with a microscopic nematode (Litylenchus crenatae) that feeds on beech leaves and buds, leading to distinctive striping, curling, and thinning of leaves. Symptoms were first observed in New York City around 2020, and BLD has since spread to all five boroughs. The American beech is an integral component of our forest ecosystems, making BLD a serious concern. This month, help track its continued impact by making observations of infected beech trees in natural areas throughout the city.
How to Get Started
- Download the iNaturalist app or register at iNaturalist.org.
- Photograph infected beech trees anywhere in New York City.
- Upload your observations to iNaturalist.
- Respect wildlife (do not touch, feed, or disturb animals, and keep a safe distance).