Thursday February 22, 2024

California Department of Parks and Recreation

California State Parks’ Division of Boating and Waterways (DBW) today announced plans to control aquatic invasive plants in the west coast’s largest estuary, the Sacramento-San Joaquin Delta and its southern tributaries. Starting March 6 through Nov. 30, 2024, DBW crews will begin herbicide treatments onwater hyacinth, South American spongeplant, Uruguay water primrose, Alligator weed, Brazilian waterweed, curlyleaf pondweed, Eurasian watermilfoil, coontail, ribbon weed, and fanwort in the Delta. Depending on weather conditions and plant growth/movement, treatment dates may change. Select areas of the Delta with high infestations or coverage of water hyacinth will be controlled using mechanical harvesting efforts through December 2024.

DBW works with local, state, and federal entities to better understand the plants and implement new integrated control strategies to increase efficacy. These aquatic invasive plants have no known natural controls and negatively affectthe Delta’s ecosystem as they displace native plants. Continued warm temperatures help the plants proliferate at high rates. Plants are also known to form dense mats of vegetation creating safety hazards for boaters, obstructing navigation channels, marinas, and irrigation systems. Due to their ability to rapidly spread to new areas, itis likely that the plants will never be eradicated from Delta waters.Therefore, DBW operates a “control” program asopposed to an “eradication” program.

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