Hydrilla

"This may be an uphill battle for us, but we're starting it."

Army Corps of Engineers surveys the lake, looking for noxious weed.

Cayuga County Health Department officials went door-to-door in part of Genoa on Thursday to warn people to not swim in Cayuga Lake near their property until Friday.

In Tompkins County, educational activities and games were organized by FORCES, Friends of Recreation, Conservation and Environmental Stewardship.

In September, a class from Wells College was on Cayuga Lake, near Aurora, when someone noticed a non-native weed in the water. It was hydrilla, an…