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Insect Management Services

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Tree & Shrub Insect Damage in Central NJ: What to Watch For

Insects can cause serious damage to trees and shrubs in Central New Jersey. The trouble is most infestations don’t show up right away. By the time you see damage, insects may have been feeding for weeks. Signs include yellow leaves, thin branches, and webbing.

Princeton Tree Care offers insect management as part of our plant health care programs. We check your trees regularly. We find problems early and treat them quickly. That last part matters more than most people think. Treat too late in the season, and you may have to wait a full year before conditions allow for effective treatment again. One thing worth knowing upfront: treatment helps control insects, but it may not remove all of them. That’s why regular monitoring and follow-up are a core part of what we do.

Insect Management Services
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Green leaves eaten by pests , have holes.
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Tree & Shrub Insect Treatment Services

Here are the common insect treatment services we offer in Central Jersey.

Boxwood Psyllid

Boxwood psyllid is a sap-feeding insect that attacks boxwood shrubs, one of the most popular plants in residential yards throughout Somerset County. If your boxwood leaves are cupping or curling, or if you notice small, white, cottony masses on the plant, psyllids are probably the cause. 

Repeated attacks weaken your shrubs and make them more prone to damage. Treatment works best between May and June when adults are most active. Annual follow-up keeps populations from bouncing back.

Spider Mites

Spider mites are tiny and very hard to see with the naked eye. Although small, they leave behind easy-to-spot damage. Stippled (tiny pale dots or speckles across the leaf surface) or discolored leaves are classic warning signs. They’re active all growing season and spread fast in hot, dry weather. That makes summer a high-risk window in Central NJ. Spider mite treatment options depend on timing and temperature, and we inspect annually to stay ahead of mite pressure before it gets out of hand.

Scale Insects

Scale insects don’t look like bugs; they look more like small bumps on bark or stems. But they feed on plant sap and can quietly weaken trees and shrubs over time. The earlier you catch them, the easier they are to treat. You can usually treat small infestations with foliar sprays. 

But once scale gets established on a larger tree, trunk injection is often the better route. We look at the size of the tree and how far the infestation has spread before choosing the right approach.

Bagworms

Bagworms build small protective cases out of plant material and hang from branches while they feed. They go after a wide range of trees and shrubs: arborvitae, juniper, and spruce are common targets in Central NJ yards. A heavy infestation can strip foliage fast.

When we can, we recommend manually removing the bags before treatment. Foliar sprays work well for early infestations. But as with scale, heavier or recurring pressure may call for trunk injection. Either way, acting early in the season gives you the best shot at protecting your trees.

Tent Caterpillars

Tent caterpillars are hard to miss. They build large, silky web nests in the forks of branches, usually showing up in early spring. They feed on leaves in groups, and a big colony can strip branches quickly. A healthy tree can often bounce back from one bad season, but repeated infestations take a real toll over time.

We target them early in their lifecycle, before serious feeding damage sets in. Catching them in spring is the key.

Hemlock Woolly Adelgid

Hemlock woolly adelgid is one of the most destructive insect pests in New Jersey. This invasive pest feeds on eastern hemlock trees and can kill them within 4 to 10 years without treatment. HWA has been active in New Jersey since the mid-1980s and remains a serious threat to hemlocks throughout Somerset County. There are no native predators here to keep it in check, which means it won’t go away on its own.

The clearest sign of an infestation is small white woolly masses at the base of the needles visible year-round, even after the insects are dead. Smaller trees are treated with foliar applications while larger ones require trunk injection. A follow-up visit is scheduled three to four months after treatment, and multiple seasonal applications are typically needed to keep the pest under control. Don’t leave them unaddressed; hemlock decline has been shown to reduce property values. Not just on the affected property, but on neighboring ones too.

Professional Insect Management Services in Central NJ

Every pest on this list has one thing in common: the earlier you treat it, the less damage it does. Waiting until things actually look bad limits what treatment can do for you and usually means more work down the road. Curious about treatment costs or how long it takes? Contact us for a personalized estimate and schedule that fits your needs.

Noticed changes in your trees or shrubs? If you’ve seen stippled or yellowing leaves, webbing on branches, white cottony insects, foliage thinning out, or anything that looks off, don’t wait to have it checked. Our ISA-certified arborists can see what’s going on and put together a treatment plan before the problem gets any worse.

Frequently Asked Questions

Here are some common questions customers ask us about insect management services.

How often do trees need to be treated for insects?

It depends on the type of insect and how bad the problem is. Some insects require multiple treatments within a single season, while others are managed with annual applications. 

The short answer: insect management isn’t a one-and-done service. Regular monitoring is what keeps small problems from turning into big ones. We build treatment schedules around your specific trees’ needs rather than a one-size-fits-all approach.

Can I treat tree insects myself?

Maybe more minor pest issues. You might be able to get away with store-bought treatments. But most of the insects we treat, especially hemlock woolly adelgid, scale, and bagworms, need professional-grade treatments applied at very specific times of year. 

Using the wrong product or treating outside the right window often does little more than waste money. Trunk injections, which are needed for larger trees and heavier infestations, require specialized equipment and can only be applied by a licensed professional.

How do I know if my tree has an insect problem?

The signs vary. Some things are worth looking for on any tree or shrub. Yellowing, stippled, or discolored leaves are a common early warning sign, so is thinning foliage. Webbing on branches, white cottony masses on stems or needles, small bumps on bark, or silky nests in branch forks are all red flags. The tricky part is that by the time these symptoms are obvious, the infestation has usually been going on for a while. If something looks off, it’s worth having a certified arborist at Princeton Tree Care take a look sooner rather than later.

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