Inyo County Seal
Mono County Seal

Inyo and Mono Counties

Agricultural Commissioner's Office

Eastern Sierra Weed

Management Area

Mission Statement

To facilitate, coordinate and promote the establishment of an integrated weed management program directed toward the eradication and control of noxious weeds in the Eastern Sierra Weeds Management Area (ESWMA). Boundaries of the management area extend south to Nine Mile Canyon (Kennedy Meadows Road), east to Owens Lake, north to include the crest if the Inyo and White Mountains, the California/Nevada border to Bridgeport, then west to include the crest of the Sierra Nevada Mountains down to Nine Mile Canyon. Although, the ESWMA working group feels these are manageable boundaries, they also remain flexible so that is a noxious weed population requires treatment outside these boundaries and the group agrees this is a priority project, then the project will be considered.


The Eastern Sierra Weed Management Area was officially formed in 1998 and was entered into by the California Department of Food and Agriculture (CDFA), Inyo/Mono Counties' Agricultural Commissioner's Office, Los Angeles Department of Water and Power (LADWP), Inyo County Water Department, Bureau of Land Management Bishop Field Office (BLM), Inyo National Forest (USFS), Toiyabe National Forest (USFA), California Department of Forestry, Natural Resource Conservation Service, Inyo/Mono Conservation District, Inyo/Mono Counties' Cattleman's Association, and the California Department of Transportation District 9 (Caltrans).

The Inyo/Mono Counties’ Agricultural Commissioner’s office operates a noxious weed program as well as administering the Eastern Sierra Weed Management Area. The ESWMA includes public and private entities that aid in local weed issues. In 2006, this program was responsible for controlling about 118 net acres of weeds that covered over 35,000 gross acres of range and cropland. The weed program is also involved with controlling and preventing weed spread in the newly re-watered LORP area.

What is and exotic species? There are invasive weeds that present a serious threat to lands in Inyo and Mono Counties. Weeds take over native environments and cause many problems, such as increased erosion fire danger and water consumption, decreased wildlife habitat and biodiversity, and losses in recreational opportunities and crop destruction. Some weedy species are even toxic to livestock and humans.

Some of the serious weedy invaders that occur locally include Perennial pepperweed, Dalmatian toadflax, Halogeton, Russian knapweed, Spotted knapweed, Canada thistle and Scotch thistle. All of these weeds have the potential to spread explosively. Perennial perpperweed has taken over other areas in the Eastern Sierra, such as Reno, NV and Susanville, CA, where there is no longer hope that it can be controlled. Russian knapweed, Spotted thistle, and Canada thistle have taken over many rangeland areas in the western US and destroyed the environment and agricultural usability of the land. Scotch thistle has created dense stands in many parts of northern California that not even cattle can walk through. If invasive weed threats are not taken seriously, these scenarios could be repeated here in Inyo and Mono Counties.

Pepperweed before

Perennial pepperweed before treatment

            Perennial pepperweed after treatment

Pepperweed after

Noxious Weed Location Form

Annual Reports

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