For Montclair homeowners who take pride in their tree-lined streets and shady backyards, a healthy canopy is part of what makes the neighborhood feel alive. But pests can change that fast. From emerald ash borers hollowing out beloved ash trees to spotted lanternflies coating patios with sticky residue, pest infestations often go unnoticed until serious damage is done. The good news? With early detection and professional care, most tree pest problems can be managed before they spread. That’s exactly what American Tree Experts, Inc. has been helping Montclair homeowners do since 1934: protect their trees with safe, science-backed pest management that keeps landscapes healthy and thriving year after year.
Why Montclair Trees Are Especially Vulnerable
Montclair’s dense, older neighborhoods offer the perfect mix of mature trees and close spacing, which is a dream for homeowners but also for invasive pests. Many of these insects, like the emerald ash borer and spotted lanternfly, thrive in urban and suburban environments where tree diversity is limited. Combine that with changing weather patterns and compacted soil, and it’s no surprise that infestations can spread quickly across yards and blocks.
The Most Common Tree Pests in Montclair, NJ
Below are the most frequent offenders local arborists see, and the warning signs to catch them before serious damage occurs.
1. Emerald Ash Borer (EAB)
This small, metallic green beetle has destroyed millions of ash trees across New Jersey.
Signs of Infestation:
- D-shaped exit holes in the bark.
- S-shaped tunnels under the bark (when peeled back)
- Top-to-bottom thinning of the canopy.
- Splitting bark and increased woodpecker activity
Act Fast: Once symptoms appear, damage progresses rapidly. Our experts at American Tree use targeted trunk injections and monitoring to protect valuable ash trees before infestations become fatal.
2. Asian Longhorned Beetle
Recognizable by its long black-and-white antennae, this pest attacks maples, elms, and willows, all common in Montclair yards.
Signs of Infestation:
- Yellowing or drooping leaves.
- Sawdust-like frass near the tree’s base.
- Round, pencil-sized exit holes in bark.
- Branch dieback.
Left untreated, these beetles can hollow out a tree from the inside, leading to structural failure or death.
3. Spotted Lanternfly
This invasive insect is a growing problem throughout Essex County. It feeds on sap from trees like maples, walnuts, and fruit trees.
What to Look For:
- Gray egg masses on tree trunks, fences, or even patio furniture.
- Sticky “honeydew” residue on leaves, railings, and cars.
- Sooty black mold forming on surfaces.
- Adults with spotted wings hopping around your yard in late summer.
While spotted lanternflies rarely kill trees outright, their feeding weakens plants and creates ideal conditions for disease and mold.
4. Gypsy Moth (Spongy Moth)
These destructive caterpillars are known for large-scale defoliation. They favor oaks and other hardwoods, both abundant in Montclair.
Warning Signs:
- Hairy caterpillars feed on leaves in late spring.
- Tan-colored egg masses on trunks or furniture.
- Bare branches with little to no foliage.
Repeated defoliation over consecutive years can kill even mature trees.
5. Japanese Beetle
These shiny green beetles are small but mighty. They devour soft leaf tissue, leaving a “skeletonized” pattern behind.
Spot the Damage:
- Lace-like leaf remains on ornamental trees and shrubs.
- Heavy activity on sunny days.
- Small groups of beetles feeding together in the form of clusters.
Japanese beetles often target linden, birch, and fruit trees, making them a frequent nuisance for Montclair gardeners.
6. Eastern Tent Caterpillar
Active early in spring, these caterpillars create the telltale silky “tents” in fruit and ornamental trees.
Indicators:
- Silken webs in branch forks.
- Small black or striped caterpillars are crawling on bark.
- Rapid leaf loss in affected areas.
Their feeding can severely stress young or newly planted trees, so prompt removal is key.
7. Aphids
They might be tiny, but aphids can cause major problems over time.
Common Signs:
- Sticky residue (honeydew) dripping from leaves.
- Curling or yellowing foliage.
- Black sooty mold growth.
- Ants clustering around trees (feeding on the honeydew).
These pests drain nutrients from leaves and can spread viral diseases among nearby plants.
How to Spot Tree Pest Damage Early
Early detection can mean the difference between saving and losing a tree. Here’s what homeowners should check for:
- Yellowing or wilting leaves occur when watering and soil conditions are normal.
- Holes, frass, or tunnels on the trunk or branches.
- Peeling or splitting bark, exposing galleries beneath.
- Reduced foliage density or uneven canopy growth.
- Sticky residue or mold on surfaces under your trees.
If you notice any of these signs, don’t guess; rather, have a certified arborist inspect the tree before it worsens.
What to Do If You Suspect an Infestation
Here’s the thing: DIY sprays and online “tree hacks” rarely solve the root issue. Some pests, like the emerald ash borer, live beneath the bark, where store-bought treatments can’t reach.
A professional pest management plan typically includes:
- Inspection & Diagnosis – Identifying the exact pest and stage of infestation.
- Targeted Treatment – Using safe, effective materials applied directly to problem areas.
- Ongoing Monitoring – Regular follow-ups to ensure pests don’t return.
- Nutrient Support – Strengthening trees with custom liquid injections to boost recovery.
American Tree Experts uses environmentally responsible methods, ensuring both the safety of your property and the long-term health of your trees.
Keep Montclair’s Tree Canopy Healthy
Montclair’s trees are part of what makes this community beautiful — but they can’t fight pests alone. Regular inspections and early action can save your landscape and prevent costly removals later.
If your trees show signs of infestation or decline, call the professionals who’ve been protecting Montclair’s greenery for nearly a century. For more information, call (973) 744-6091 or email am*******************@***il.com








