Lake Tahoe Basin Invasive Weed Coordinating Group

2009 LTBWCG Annual Report and Newsletter

El Dorado County Invasive Weed Management Group - 2008  

A Builder and Contractor's Guide to Preventing the Introduction and Spread of Invasive Weeds

A Landowner's Guide to Preventing the Introduction and Spread of Invasive Weeds

Selected Invasive Weeds of the Central Sierra Nevada - A Field Guide
4th Edition April 2007

Dont Plant A Pest Brochure - Sierra Foothills Region

Please Don't Plant A Problem! An invasive weed to watch for: Oblong Spurge Brochure 2009

Group 1 - These terrestrial species are: a) not currently found in El Dorado County, or b) documented as small, eradicable populations, or c) deemed controllable along a defined eastern leading edge to prevent spread into the Sierra Nevada Mountains. Encourage active control/eradication efforts and education in El DoradoCounty.

Yellow starthistle (Centaurea solstitialis); eradicate at 3500 ft. elevation and higher
Spotted knapweed (Centaurea maculosa)
Tall whitetop/perennial pepperweed (Lepidium latifolium)
Dalmatian toadflax (Linaria genistifolia ssp. dalmatica)
Oblong spurge (Euphorbia oblongata)
Tamarisk/saltcedar (Tamarix spp.)
Scarlet wisteria/rattlebox (Sesbania punicea)
Purple loosestrife (Lythrum salicaria)
Canada thistle (Cirsium arvense)
Diffuse knapweed (Centaurea diffusa)
Rush skeletonweed - control at 3500 ft. elevation and higher (Chondrilla juncea)
Hoary cress (Cardaria draba)
Lens-podded whitetop (Cardaria chalepensis)
Purple starthistle (Centaurea calcitrapa L.)
Russian knapweed (Acropition repens)
Stinkwort (Dittrichia graveolens)
Yellow toadflax (Linaria vulgaris)
Giant knotweed (Polygonum ssp.)
Sicilian starthistle (Centaurea sulphurea Willd.)
Meadow knapweed(Centaurea debeauxii ssp. thuilierii) 

Group 2 - Encourage the management/control of isolated populations of these species to prevent further spread in El DoradoCounty. 

Brooms (Scotch - Cytisus scoparius, French - Genista monspessulana and Spanish - Spartium junceum)
Arundo/Giant reed (Arundo donax)
Fennel (Foeniculum vulgare)

Group 3 - Other terrestrial species of concern; continue to increase public awareness and encourage control efforts on public and private lands.

Tree of Heaven (Ailanthus altissima)
Himalaya blackberry (Rubus discolor)
Puncture vine (Tribulus terrestris)
Pampasgrass (Cortaderia selloana)
Johnsongrass (Sorghum halepenses)
Yellow sweetclover (Melilotus officinalis (L.) Lam.
White sweetclover (Melilotus alba Medic.)
Medusahead (Taeniatherum caput-medusae)
Goatgrass (Aegilops triuncaialis)
Italian thistle (Carduus pycnocephalus)
Hedge parsley/Beggar's lice/Velcro stickers (Torilis nodosa)
Bull thistle (Cirsium vulgare)
Tocalote (Centaurea melitensis)
Klamathweed (Hypericum perforatum)
Yellow starthistle (Centaurea solstitialis); encourage control below 3500 ft. elevation 

Watch List - These terrestrial species are under consideration to be added to the Invasive Weed Priority List; more information is needed to evaluate their invasive characteristics and/or ability to growing in western El DoradoCounty. 

Rose campion (Lychnis coronaria)
Tree tobacco (Nicotiana glauca) 

Aquatic weeds too watch for:
Hydrilla (Hydrilla veticillata)
Sponge plant/smooth frogbit (limnobium laevigatum)
Eurasian watermilfoil (Myriophyllum spicaturm)