Control & Management of Invasive Species in New York How to control and manage invasive species in the St. Lawrence – Eastern Lake Ontario region of New York. Swallow-wort, purple loosestrife, giant hogweed, water chestnut, glossy buckthorn, Eurasian water milfoil, Eurasian frog-bit, Didymo (rock snot), Japanese knotweed Sleloinvasives.org~Site InfoWhoisTrace RouteRBL Check