Arundo Control and Restoration Project

Arundo (Arundo donax) is a non-native invasive grass that grows up to 25 feet tall along the edges of sloughs and canals in the Sacramento-San Joaquin Delta and is also abundant in the Sacramento and San Joaquin River watersheds. Arundo restricts shoreline access, consumes and wastes water, obstructs flood control channels, creates fire hazards along sloughs and rivers, and displaces native plants and associated wildlife.

The Delta Conservancy and the Department of Water Resources identified the need to address Arundo in the Delta and to restore the areas overrun by the grass with native vegetation. The Delta Conservancy established the Arundo Control and Restoration Project first to map and prioritize areas of Arundo in the legal Delta and then to control Arundo and restore native habitat.

Arundo within Cache Slough Complex

Arundo within Cache Slough Complex (Photo courtesy of Delta Conservancy staff)

Arundo

Arundo within Cache Slough Complex (Photo courtesy of Delta Conservancy staff)

With funding from the Department of Water Resources, the Delta Conservancy is working with the Sonoma Ecology Center to map Arundo sites in the Delta and also prioritized those sites according to their restoration value. The Delta Conservancy is also working with the U.S. Department of Agriculture – Agricultural Research Service’s Delta Region Areawide Aquatic Weed Project in identifying potential sites for biological control of Arundo.

Map

Map of Arundo donax sites in the Delta (Photo courtesy of Sonoma Ecology Center)

Also with DWR funding, the Delta Conservancy is contracting with the Solano Resources Conservation District and Sonoma Ecology Center on a pilot project of Arundo control and habitat restoration in the Cache Slough Complex. Implementation of this project is ongoing since 2015 and will be followed by three years of maintenance and monitoring.

The Delta Conservancy is seeking additional funding sources and collaborative partners to develop sites for further implementation and monitoring of Arundo control projects in the Delta.

Crane

Chemical treatment of Arundo (Photo courtesy of Sonoma Ecology Center)

Treated Arundo

Chemically treated Arundo on the left, residual riparian vegetation on the right (Photo courtesy of Delta Conservancy staff)

Websites for Arundo Control and Restoration Project Partners: