tel:860-337-4850Caterpillar infestations can quickly defoliate and stress even the healthiest trees, reducing vigor and leaving them vulnerable to further pest and disease issues. At ArborActive, we specialize in identifying and treating caterpillar outbreaks with targeted, eco-conscious solutions. In this post, we’ll focus on two particularly damaging pests in our region: spongy moths (formerly known as gypsy moths) and the relatively new arrival, winter moth. We’ll also discuss the best timing for treatment and outline biorational and organic options that protect your trees without harming the environment.

Spongy Moth: A Persistent Defoliator

Spongy moths (Lymantria dispar) have plagued Northeastern landscapes for decades. These voracious feeders target a wide variety of deciduous trees, including oaks, maples, and birches. Heavy infestations can strip trees bare in a matter of days.

Lifecycle Timing:

• Egg masses hatch in late April to early May, depending on spring temperatures.

• Caterpillars feed for 6–8 weeks, reaching peak feeding in June.

• By mid-July, the feeding phase is complete, and the adult moths emerge.

Winter Moth: A New and Sneaky Threat

The winter moth (Operophtera brumata), originally from Europe, has spread into parts of the Northeast. This pest is particularly damaging to maples, oaks, and fruit trees. What makes winter moths tricky is their early start: they hatch while trees are still leafing out, often going unnoticed until damage is extensive.

Lifecycle Timing:

• Adult moths emerge in late fall, mate, and lay eggs on tree bark.

• Eggs overwinter and hatch in late March to early April.

• Larvae feed heavily on young, tender leaves through May.

Biorational and Organic Treatment Options

At ArborActive, we offer a suite of targeted, environmentally responsible treatments that minimize harm to beneficial insects, pollinators, and the surrounding ecosystem.

Protect Your Trees the Smart Way

Proactive treatment is the key to preventing long-term damage. At ArborActive, we emphasize early detection, precision application, and eco-friendly methods. Our team will work with you to create a customized plan that targets pests effectively while preserving the health of your trees and your landscape.

Don’t wait until your trees are already under attack—schedule your consultation today to prepare for the upcoming caterpillar season.

Need Help with Caterpillars?
Call ArborActive at 860-337-4850 or contact us online to request a site visit. We’re here to help your trees thrive—naturally.