California parks officials will begin another season of herbicide treatments in the Sacramento–San Joaquin Delta later this month, targeting invasive aquatic plants that clog waterways, threaten boaters and disrupt marinas and irrigation systems. Starting March 19, California State Parks’ Division of Boating and Waterways (DBW) plans to treat thousands of acres across the Delta and its southern tributaries as part of its 2026 control program. The invasive plants include water hyacinth, South American spongeplant, Uruguay water primrose, Alligator weed, Brazilian waterweed, curlyleaf pondweed, Eurasian watermilfoil, coontail, fanwort and ribbon weed. 

Other invasive species news:

• The Inyo Register (Bishop, Calif.): Warding off a mollusk apocalypse: Mono Supes on board with ordinance to keep out golden mussels
• The Stockton Record (Calif.): Photos: Water hyacinth has plagued the Delta over the years
• The Stockton Record (Calif.): Video: 3 invasive species endangering California Delta waterways, levees​