The U.S. Army Corps of Engineers is ramping up efforts to control the spread of hydrilla, an aggressive invasive aquatic plant, across several key waterways in Western New York this summer.
Beginning the week of June 23, the Buffalo District launched a series of weekly treatments in Cayuga Lake at Aurora and in the Cayuga Inlet at Ithaca. These applications—set to continue through late August—are taking place once a week in each location, with Wednesdays scheduled for Aurora and Thursdays for Ithaca. In case of rain, treatments will be postponed by a day.
Hydrilla treatments are also slated for the Erie Canal on July 23 and 24. If weather interferes, those sessions will be delayed by one week.
The Corps is using a combination of granular and liquid herbicides approved by the New York State Department of Environmental Conservation and the U.S. Environmental Protection Agency. Treatment strategies are tailored for each location, with strict adherence to environmental safety standards. While the herbicides are considered safe, some temporary restrictions on water use may apply. These guidelines are communicated via pamphlets and posted signs at all public access points in affected areas.
Hydrilla, a fast-growing plant native to Eurasia, forms thick underwater mats that outcompete native vegetation and disrupt ecosystems. “Hydrilla can alter water chemistry, cause dramatic swings in dissolved oxygen levels, increase water temperatures, and affect the diversity and abundance of fish populations,” the Corps stated.
Beyond ecological damage, hydrilla poses economic risks. Dense infestations interfere with boating and fishing, hurt tourism, and can clog infrastructure like hydropower facilities and flood systems. The plant’s spread is often aided by fragments attached to recreational boats and trailers—just a small piece can start a new infestation.
The Buffalo District has been tracking hydrilla growth since 2012 and implementing targeted treatments since 2013. These efforts are part of the Aquatic Plant Control Research Program, authorized under Section 104 of the River and Harbor Act of 1958.
Photos and videos of the treatment program are available online at Flickr and YouTube.
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