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The Hydrilla Menace: Twin Lakes group buoyed by DEEP’s assault on invasive hydrilla in 2025
May 05, 2025
A detail of a whorl of hydrilla pulled from the shallow waters at O’Hara’s Landing Marina in fall of 2024.
Photo by Debra A. Aleksinas
SALISBURY — The Twin Lakes Association is taking an earlier and more aggressive approach to fighting the spread of invasive hydrilla in East Twin Lake by dosing the whole northeast bay, from May through October, with low-level herbicide treatments instead of spot treatments.
The goal, said Russ Conklin, the TLA’s vice president of lake management, is to sustain herbicide concentration over the 2025 growing season.
That plan of attack will continue over a period of 60 to 90 days beginning May 21, Conklin explained during the association’s April 30 membership meeting via Zoom which drew 60 attendees.
TLA officials were encouraged by the chance to stop the spread and hopefully destroy the thick mats of the unyielding invasive plant hydrilla verticillata, referred to as the Connecticut River variant, after two years of chasing new growth around the lake’s north bay.
Dense patches were first discovered in the summer of 2023 in shallow waters around O’Hara’s Landing Marina and the nearby state boat launch and the plant has since migrated further into East Twin, following a pattern of boat traffic.
Past treatment efforts were hampered by delayed permits from the state Department of Energy and Environmental Protection to treat the hydrilla with herbicides in an area where a rare plant had been identified.
This year, the TLA was granted an exception by DEEP, said Conklin, as any protected plant species in the path of hydrilla would likely not survive anyway.
“It is not dead now, but it is going to be if we don’t do something about the hydrilla.”
“This is a big year for us,” Conklin said. “Hydrilla is a real threat to the lake, and we did treat it this past year, but the permits only applied to the plant, so we spot treated it … and were always chasing it.”
The course of action this year, he said, is to treat the entire northeast bay with the herbicide Sonar in both liquid and crystal form at a very low levels so that the herbicide’s contact time with hydrilla will be extended for a longer period over 60 to 90 days.
“We know from past experience that it is much easier to kill the plant when it’s small,” Conklin explained. The goal, he said, is to attack the stringy, green weed before August when it crowns and splits into numerous growing points that are capable of growing at the rate of an inch a day.
During the hour-long meeting, discussion also focused on a pilot program for enhanced cyanobacteria monitoring at Twin Lakes to be headed by TLA director Jessica Swartz, a resident of West Twin Lake and biotech executive with Pfizer.
“It’s very visibly challenging to identify cyanobacteria blooms,” Swartz explained, as it can easily be confused with pollen on the surface of the water, dead vegetation or different types of algae.
Cyanobacteria, also known as blue-green algae, are natural, important phytoplankton in lake ecosystems. Dense blooms, which release toxins, occur when there is an abundance of sunlight, elevated phosphorus levels and warm temperatures.
Given the current escalation in overly-nutrient rich waterbodies and rising temperatures due to global climate change, the frequency of cyanobacteria blooms is increasing, said Swartz, and Twin Lakes has occasionally experienced localized blooms.
As a result, the association will be implementing a pilot testing program with greater frequency and at more locations than currently conducted by the TLA’s limnologist, George Knoecklein. The goal of the pilot program is to work out the process of collecting reliable data over time that helps inform whether cyanobacteria blooms are occurring, where they are most frequently found, and assess the level of risk.
Sample test kits have been ordered for five or six testing sites across East and West Twin, including at the private Salisbury School.
TLA president Grant Bogle invited Swartz to give an update at the association’s upcoming June 14 membership meeting at Camp Isola Bella.
Despite rising lake management costs projected at $500,000 this year, Bogle reported that the TLA is in strong shape financially heading into the 2025 season, as it received another $75,000 grant from DEEP and $25,000 from the Bates Foundation to support the Watershed Study.
Also, the town of Salisbury has earmarked $75,000 for Twin Lakes this season, said Bogle, and the TLA membership has “responded generously” contributing more than $300,000 since August 2024 when the group started its 2025 fundraising campaign.
Bogle also encouraged members to attend the May 12 public meeting of the Salisbury Inland Wetlands & Watercourses Commission, which is expected to address proposed changes to the Upland Review Area encompassing the town’s lakes.
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Frederick Wright Hosterman
Apr 30, 2025
KENT — Frederick Wright Hosterman passed away peacefully in his home in Kent on April 16, 2025. Born in 1929 in Auburn, Nebraska, he was the son of farmers. He attended a one-room schoolhouse just outside of Brownville, Nebraska, adjacent to his family’s farm. The little brick schoolhouse is still standing! After graduating from high school, Fred attended the University of Nebraska (Lincoln), eventually earning a master’s degree in agronomy. He took a job with Monsanto in Buffalo, New York, where the company was a pioneer in applying biotechnology to agricultural sciences. In Buffalo, Fred met his future wife, Dorothy. Fred and Dorothy moved to New York City for several years in the early 1960s, before settling down in Norwalk. In Norwalk, Fred and Dorothy had three children. The family later moved to Kent. In 1980, Fred and Dorothy divorced, and Fred bought a large tract of land on Carter Road in Kent. He built a house there, largely by himself, which he maintained until his death at age 95. After taking early retirement, he spent the following decades working on his property, adding various buildings, woodcrafting, landscaping, and spending time with his children and grandchildren.
Fred had a jovial and close relationship with many of his neighbors, who he saw daily, all willing to share a cup of coffee or receive various bits of wisdom from Fred on any number of projects.
Fred was predeceased by his parents; Helen and Arch Hosterman, step-mother Cassie Hosterman, sisters Ruth and Esther Marie, brother Richard, and former wife Dorothy. He is survived by his three children and their spouses; John and his husband Eric of Northfield, Minnesota, Tracy and her partner, Sam, of Amenia, New York, and Catherine and her husband, Josh, of Cornwall. He is also survived by his five grandchildren; Nicky, Dan, Ian, Zachary, and Eliza, and several nieces and nephews.
Fred loved to flirt with the ladies, even in his 90s, doing a little “dance” for almost anyone he met. Another of Fred’s favorite hobbies was chopping down trees on his land. Initially, this started out as a necessity for fueling his wood stoves. Later, tree-clearing projects were aimed at enhancing the magnificent view from his house high atop Carter Road. Even at age 95, Fred was frequently on his excavator moving boulders or building a retaining wall, as he was strong, healthy and witty until his final weeks.
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Eleanor Anne Sternlof
Apr 30, 2025
LIME ROCK — Eleanor Anne Sternlof (née de Guise) of White Hollow Road passed away on April 25, 2025 at Geer Village in North Canaan, Connecticut. She was 94 and the loving wife of the late Paul William Sternlof, who died on August 12, 2005.
Eleanor was born July 14, 1930 in Lowell, Massachusetts as the eldest child of the late George and Vera (née Gale) de Guise. Eleanor graduated from Chelmsford High School in 1948 and from Clark University in 1954. She met Paul as a fellow student at Clark and they married in May 1954.
Eleanor worked for Mohawk Airlines while Paul earned his MBA in Hospital Administration at Yale University. In 1958 they moved to Baltimore, Maryland, and started a family while Paul worked as Assistant Administrator at Baltimore General Hospital.
Their first two children, Karl and Kurt, were born in Baltimore. They moved to Sharon in 1962 when Paul became President of Sharon Hospital. Two more children followed, Mark and Erika, and the family settled on White Hollow Road in 1965.
Eleanor and Paul were together avid beekeepers, vegetable gardeners, brewers of mead and motorcycle enthusiasts. She was a skilled seamstress, doll maker, canner and general DIYer who learned carpentry taking adult-ed classes at Housatonic Valley Regional High School. In 1977, while her two middle boys were students there, Eleanor took a job in the Superintendent’s Office and quickly became notorious for riding her motorcycle to work. She retired in 1992.
In 1995, Eleanor and Paul bought a winter home on Fripp Island in South Carolina and made many new friends. She volunteered for years there as a teaching aide in the public schools and sang alto in the island choir. Eleanor moved back to White Hollow full time in June 2020 and finally to Geer Village in October 2021.
After Paul passed, Eleanor focused on fulfilling her lifelong dreams of world travel by visiting Peru, Cuba, Egypt, Turkey, Greece, Finland, Hungary, Albania, Russia and more with a close-knit band of fellow adventurers. She delighted in telling stories of her travels, such as her tangle with a decrepit rope bridge in the Amazon and caravanning by camel in Egypt.
Eleanor is survived by her children, Karl Sternlof (Kerin Woods) of New London, Connecticut, Kurt Sternlof of Newton, Massachusetts, Mark Sternlof of Pittsfield, Massachusetts, and Erika Sternlof of Bath, Maine; her grandchildren, Emma Sternlof (Michael Conlin) of Durham, North Carolina, Nora Sternlof of Chicago, Illinois and Erik Sternlof of Newton, Massachusetts; her great grandchild Brian Conlin and her sister Evelyn Webber of Rochester, New York.
Memorial activities will be announced at a later date. The Kenny Funeral Home has care of all arrangements.
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