2020 Hydrilla Eradication Efforts in the Cayuga Lake Watershed

June 2020 - Cayuga Inlet and Southwestern corner of the lake

Hydrilla (Hydrilla verticillata) was absent from Cayuga Inlet and Fall Creek from 2015-2018. However, in fall 2019, hydrilla patches were found in Cayuga Inlet and the southwestern corner of the lake. The patches offshore of Stewart Park and around the Merrill Sailing Center were treated in 2019 and are being monitored.

The U.S. Army Corps of Engineers Buffalo District (USACE Buffalo) proposes to apply the aquatic herbicides fluridone (Sonar® H4C) and chelated copper (Harpoon® Granular) within an approximately 51-acre project area along approximately 5,500 linear feet of shoreline along Stewart Park, the Cornell Community Sailing Center, and Cass Park on Cayuga Inlet (see larger version of the  Hydrilla Treatment Areas Map 2020.).

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The USACE Buffalo project is being closely coordinated with a project being completed by the Tompkins County Soil and Water Conservation District (TCSWCD) within the same vicinity on Cayuga Lake. The TCSWCD hydrilla project will address two areas, approximately 13.6 acres in size, north of Allan H. Treman State Marine Park (see map ).

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For the USACE Buffalo project, the initial application of Sonar® H4C  is targeted for the week of June 22, 2020, and a total of 10 treatments will occur between June and August. Additionally, if there is any significant re-establishment of hydrilla beds in the 51-acre project area, those beds may be spot treated with Harpoon® Granular, on or about the week of August 10, 2020. These spot treatment applications are not expected to exceed approximately 10 acres. Signs will be posted along the lake when the herbicide is applied.

For the TCSWCD project, the application schedule will be the same as the USACE project areas with initial application of Sonar H4C the week of June 22, 2020, and a total of 10 treatments between June and August.

There are no restrictions for fishing, swimming, or livestock/pet water consumption at the proposed application rates of Sonar® H4C and Harpoon® Granular. There are restrictions for using water treated with Sonar® H4C for irrigation. There are also potable water restrictions for water treated with Sonar® H4C and Harpoon® Granular if treated water concentrations are above the thresholds indicated in Table 1, “Water Use Restrictions” (attached ).

Contact

Sharon Anderson
Environment Team Leader
ska2@cornell.edu
(607) 272-2292 ext. 156

Last updated June 17, 2020