Thank you!
Your support is sustaining the future of local news in our communities.

Years-long spongy moth epidemic fades

Years-long spongy moth epidemic fades

Spongy moth larvae feed on tree leaves, contributing to stress that could kill an ailing tree.

Provided

MILLBROOK — The spongy moth epidemic of eastern Dutchess and Columbia Counties and northwestern Connecticut appears to be receding after more than three years of infestation, based on forecasting work and early-summer land surveys undertaken at Millbrook’s Cary Institute.

The spongy moth epidemic has marked widespread defoliation, affecting trees particularly in the area of the New York–Connecticut border.

The current epidemic appeared in Dutchess and Columbia Counties and in Connecticut’s northwest corner in 2021 as a result of various regional ecological factors, combined with the spongy moths’ ability for rapid proliferation.

“The white-footed mouse, which preys on spongy moth [egg masses], is usually enough to keep the population under control,” said Clive Jones, a terrestrial ecologist at the Cary Institute. “If the mouse population collapses, as it did, then the spongy moth population can escape.” Populations of parasitic wasps and flies, which bring the population down to normal levels, can take a few years to grow enough to curb the spongy moth. During this time, when the moths have few significant predators, their population grows unchecked and they rapidly defoliate trees.

This year’s wet spring contributed to the counter-epidemic of both a virus and a fungus antagonistic to spongy moth larvae.

The Cary Institute, in its 2025 forecast of the spongy moth’s prevalence, estimated the outbreak would abate during the summer, leading to a negligible population of spongy moths in previously-affected areas. “We see the population collapse due to the fungus and the virus and due to the other natural enemies’ population growing because of the moth’s rise,” Jones said.

Given the passage of an appropriate period of time for natural mechanisms to control the moth population, “we knew at Cary that there was a very low probability of much defoliation by the spongy moth [in previously-affected areas] this year,” Jones said.

Jones and his colleagues at the Cary Institute compiled their forecast of the danger the spongy moth would pose to trees this summer through the collection of data at the Cary Institute’s own 1,924-acre arboretum, the observation of satellite imagery and through samples taken around the Hudson Valley and into Connecticut’s northwest corner.

Defoliation rarely kills trees directly, even if it occurs for years in a row. But defoliation in conjunction with other harmful factors does kill trees. “Many of the trees out there are fine… but quite a lot have succumbed due to the drought in 2022 and then defoliation in ‘23 and ‘24,” Jones said.

“Spongy moth flare-ups are not cyclical in the sense that they are regularly spaced,” Jones said. “You can fit a periodicity to spongy moth outbreaks which shows that they occur about every 10 years, but it’s no more than a very rough guideline and can be completely wrong.” Before the 2021 epidemic, the last spongy moth infestation occurred in Millbrook nearly

30 years prior, limiting the statistical measures which can be taken to forecast a future spongy moth epidemic.

Latest News

Fire hydrant

Fire hydrant
Cartoon by Natalia Zukerman

Let's hear it — June 11, 2026

Let's hear it — June 11, 2026

This Week

Assemblywoman Didi Barrett, who represents parts of Dutchess and Columbia counties, is facing a Democratic primary challenge from Sam Hodge. This is a race within one party, but the questions behind it are familiar to voters of any affiliation.

How much does experience matter? What about independence, new ideas or a willingness to challenge the system? What makes someone an effective representative for your community?

Keep ReadingShow less
Letters to the editor — Thursday, June 11

Misleading headline in The News confuses readers

The Our Towns article (MN date 5/28/26) about the Webutuck school budget vote was lacking in three respects: reporting, editing and headline writing.

The reporter said the vote was approved, but he failed to include the vote count. How is the voter to know if it was a squeaker or a ground swell of approval? The voter is entitled to know.

Keep ReadingShow less
google preferred source

Want more of our stories on Google? Click here to make us a Preferred Source.

Calligraphy lessons

Calligraphy lessons

Student members of the Olivet Academy calligraphy club prepare to demonstrate their skills and teach youngsters at the Amenia Free Library on Friday, June 5. Left to right are Ruby Yoon, 17; Sophia Tran, 16; Joel Wu, 16; and Ezra Yu, 18, who founded the club in January 2025. Yu continues to build on his five years of calligraphy experience and love for the art. The club has been creating Appreciation Cards as a school activity. Yu plans to enroll at the University of Chicago in the fall, pursuing Economics and Mathematics.

Town Board approves plan for Wassaic road closure for classic car show

Keeping raindrops from staying very long on his lava orange Porsche convertible, featured at the Flowers and Fenders car show event in Wassaic on May 31, 2026, Peter Smith of Sharon was tending to both his car and the “carsage” floral installation on the car’s rear. The floral decoration was the work of Floral and Field Consulting, bringing floral design to car show events.

Photo by Leila Hawken

AMENIA — Officials approved the closure of Main Street in Wassaic ahead of a car show and flower event.

Anticipating the classic car show and flower event to be held on Saturday, June 13, the Town Board unanimously approved a resolution to close Wassaic’s Main Street to accommodate the event and visitors. Hours of the closure will be from 8 a.m. until 12 noon. This will be the second year of the popular event that combines classic cars and floral displays in profusion.

Keep ReadingShow less
Washington Planning officials say no permit required for local CSA

Washington Town Hall

Archive photo

MILLBROOK — A private community-supported agriculture operation can continue after garnering support from Washington Planning Board members.

Mindy Yang and William Harris, the married duo behind Silverbrook Manor on Route 44 west of Millbrook, appeared before the board on Tuesday, June 2, after they received a letter from the town’s zoning enforcement officer noting complaints that the property’s use was noncompliant.

Keep ReadingShow less
google preferred source

Want more of our stories on Google? Click here to make us a Preferred Source.

google preferred source

Want more of our stories on Google? Click here to make us a Preferred Source.