ROTTERDAM & BALLSTON -- Portions of the Plotterkill Preserve in Rotterdam and Anchor Diamond Park in Ballston will be temporarily closed for treatment of hemlock trees against the invasive hemlock wooly adelgid.
Anchor Diamond Park, at Middle Line Road and Route 50, was closed for treatment on Thursday with signs in the parking lot explaining the restricted public access. Some infestation was found there in 2018, and a 10-acre area is being treated. The closure will last until the treatment is completed.
The Plotterkill Preserve, where 250 trees were treated in 2017 after the insects were found, will be closed for treatment from April 29-May 3. About as many trees are expected to be treated this time, according to the Capital Mohawk Partnership for Regional Invasive Species Management.
Certified pesticide applicators from the state Department of Environmental Conservation will apply a mix of two pesticides, dinotefuram and imidicloprid, to the lower portion of hemlock tree trunks, the partnership said.
Schenectady County recently became the first county in the state to adopt a long-term hemlock wooly adelgid management plan. The larger goal is to prevent the spread of the insect, which in the long-term can be fatal to hemlocks, from spreading to the Adirondacks.