Workers at The Nature Conservancy's Long Island, NY chapter are spreading the word about the recent discovery of established populations of an invasive water primrose (Ludwigia sp.) in the Peconic River. A smart biologist has already documented the invasion with photos (see below). As reported by the ISW back in 2003, water primrose is prime mosquito habitat. If you're in the area and you think you've spotted this plant, you can find contact information for TNC's Long Island office here. TNC is considering their options for eradication or management as they study the situation more closely.
(Thanks to Andy Senesac for granting permission to use his photos.)