Emerald ash borer, spongy moth, hemlock woolly adelgid, and Asian longhorned beetle are among the insects damaging trees in New York, along with spotted lanternfly in parts of the state. Homeowners can monitor and limit caterpillars with traps and sticky trunk bands, while borers and adelgids usually call for a licensed professional, since some systemic insecticides sold elsewhere are not available for sale in New York.

Why are New York trees under pressure from invasive pests?

Because many of these insects arrived from other continents on firewood, nursery stock, or shipping materials. Without the predators and resistant trees that hold them in check at home, their numbers can climb quickly.

How are spongy moth and other caterpillars limited?

By catching moths and blocking caterpillars on the trunk. During the summer mating season, a TreeHelp Spongy Moth Trap baited with its pheromone lure is hung near host trees to catch male moths before they mate, since each mated female can produce up to 1,000 caterpillars the following spring. To stop caterpillars climbing to the canopy, the TreeHelp Bug Band is fastened around the trunk in late fall and again in early spring.

How are ash and hemlock protected in New York?

With systemic treatments, usually applied by a licensed arborist. Ash borers and hemlock adelgids feed where sprays cannot reach, and some homeowner systemic products are restricted in the state.

Frequently Asked Questions

Which trees does spongy moth strip?

Oak, crabapple, and poplar, among hundreds of other trees and shrubs.

Does spotted lanternfly kill trees?

It weakens them by feeding on sap, and heavy feeding stresses young or already struggling trees.

Can firewood spread these pests?

Yes. Moving untreated firewood is one of the main ways invasive insects reach new areas.

What should happen if an Asian longhorned beetle is spotted?

It should be reported to state officials, since infested trees are removed to stop its spread.