Invasive Species

The Wellesley Park & Tree Division is monitoring several invasive pests and diseases threatening our local trees and plants. Here are three significant concerns residents should be aware of:

Spotted Lanternfly

The Spotted Lanternfly (SLF) was discovered in Wellesley in 2023 near Carisbrooke Reservation. This quarter-sized insect has gray wings with black spots and distinctive red underwings visible during flight. First found in Pennsylvania in 2014, SLF feeds on plant sap, damaging over 100 species including maples, fruit trees, and grapevines. Their feeding produces sticky "honeydew" that promotes black sooty mold growth on surfaces below. SLF spreads primarily by hitchhiking on vehicles. Please report sightings to MDAR at mass.gov/spotted-lanternfly. 

Emerald Ash Borer

The Emerald Ash Borer (EAB) is a metallic green beetle approximately ½ inch long that threatens all ash trees. While not yet confirmed in Wellesley, it has been detected in surrounding communities. These beetles lay eggs on ash bark, and the resulting larvae tunnel beneath the bark, disrupting the tree's vascular system. Infested trees typically die within 3-5 years, identifiable by D-shaped exit holes, canopy dieback, and increased woodpecker activity.

Beech Leaf Disease

Beech Leaf Disease (BLD) is a newer threat affecting American beech trees, caused by microscopic nematodes that infect leaf tissue. The disease creates distinctive dark bands between leaf veins and eventually leads to leaf curling, reduced foliage, and tree mortality. First detected in Massachusetts in 2020, BLD can kill younger trees within 2-7 years and is particularly concerning as beech trees are already struggling with beech bark disease.

What You Can Do

Early detection is crucial for all these invasive threats. Monitor your trees and report suspicious findings to Wellesley's Park & Tree Division. When traveling, check vehicles and outdoor equipment for hitchhiking pests before returning home.

For more information or to report sightings, contact the Park & Tree Division at (781) 235-7600 ext.3330