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CISAC has compiled the list below of over 1,700 species known to be invasive in California or a potential threat for introduction to the state. Please use the comment form below to let us know about: taxa that should be added or removed; species information that you would change; and species that you think should be a high priority for having a scorecard completed (choose Review Scorecards to see the list of scorecards already drafted). Make sure to click Save. Previous comments are displayed at the bottom of the page.

Download Species List (.csv) (to open in a Spreadsheet program)
This data download is provided to aid in the review of the draft invasive species list. We discourage other use of this data until it has been revised and finalized.

Scientific Namesort icon Common Name Type Subtype Extent Risk of Introduction First Source
Spodoptera littoralis Egyptian cottonworm arthropod butterfly, moth not present high CDFA (reg. A)
Spodoptera latifascia lateral lined armyworm arthropod butterfly, moth not present high CDFA (reg. A)
Spodoptera exempta nutgrass armyworm arthropod butterfly, moth not present high CDFA (reg. A)
Spodoptera eridania southern armyworm arthropod butterfly, moth not present high CDFA (reg. A)
Spodoptera dolichos armyworm arthropod butterfly, moth not present high CDFA (reg. A)
Spiroplasma citri Citrus stubborn disease disease spiroplasma limited VALUE REQUIRED CACASA
Sphenophorus maidis maize billbug arthropod beetle not present moderate CDFA (reg. A)
Sphaeropsis sapinea Diplodia Shoot Blight disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Sphaerophysa salsula Austrian peaweed plant herbaceous limited n/a (already in CA) CDFA
Sphaeroma quoyanum Isopod invertebrate crustaceans and tunicates VALUE REQUIRED VALUE REQUIRED NISIC
Sphaerodactylus elegans Ashy gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Sphaerodactylus argus Ocellated gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Spermophilus parryii Arctic ground squirrel vertebrate mammal widespread n/a (already in CA) Witmer et al
Spermacoce alata winged false buttonweed plant herbaceous not present low USDA Plant/Pest
Spartium junceum Spanish broom plant woody widespread n/a (already in CA) Cal-IPC list
Spartina patens saltmeadow cord grass plant grass limited n/a (already in CA) Cal-IPC list
Spartina densiflora dense-flowered cordgrass plant grass limited n/a (already in CA) Cal-IPC list
Spartina anglica common cordgrass plant grass limited n/a (already in CA) Cal-IPC list
Spartina alterniflora x foliosa hybrids smooth cordgrass and hybrids plant grass limited n/a (already in CA) Cal-IPC list
Spartina alterniflora smooth cordgrass and hybrids plant grass limited n/a (already in CA) Cal-IPC list
Sparganium erectum exotic bur reed plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Soybean Dwarf Virus Soybean Dwarf Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Sorghum propinquum sorghum plant grass not present low NV Weed List
Sorghum halepense johnsongrass plant grass widespread n/a (already in CA) WA Weed List
Sorghum bicolor perennial sweet Sudan plant grass limited n/a (already in CA) NV Weed List
Sorghum almum Columbus grass plant grass not present moderate NV Weed List
Sonchus oleraceaus common sowthistle plant herbaceous widespread n/a (already in CA) Weeds of CA
Sonchus arvensis perennial sowthistle plant herbaceous limited n/a (already in CA) CDFA
Soliva sessilis lawnweed plant herbaceous widespread n/a (already in CA) WA Weed List
Solenopsis saevissima red imported fire ant arthropod bee, wasp not present moderate CDFA (reg. A)
Solenopsis richteri X Solenopsis invicta hybrid hybrid fire ant arthropod bee, wasp not present high CDFA (reg. A)
Solenopsis invicta red imported fire ant arthropod bee, wasp limited n/a (already in CA) CDFA (reg. A)
Solenopsis geminata tropical fire ant arthropod bee, wasp not present high CDFA (reg. A)
Solanum viarum tropical soda apple plant herbaceous not present low USDA Plant/Pest
Solanum torvum turkeyberry plant woody not present low USDA Plant/Pest
Solanum tampicense wetland nightshade plant woody not present low USDA Plant/Pest
Solanum rostratum buffalobur plant herbaceous limited n/a (already in CA) ID Weed List
Solanum physalifolium hoe nightshade plant herbaceous widespread n/a (already in CA) Weeds of CA
Solanum nigrum black nightshade plant herbaceous widespread n/a (already in CA) Weeds of CA
Solanum marginatum white-margined nightshade plant woody limited n/a (already in CA) CDFA
Solanum lanceolatum lanceleaf nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum elaeagnifolium silverleaf nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum dimidiatum Torrey's nightshade plant herbaceous limited n/a (already in CA) CDFA
Solanum carolinense Carolina horsenettle plant herbaceous limited n/a (already in CA) CDFA
Solanum cardiophyllum heartleaf nightshade plant herbaceous not present low CDFA
Sogatodes orizicola rice delphacid arthropod scale, aphid not present moderate CDFA (reg. A)
Sobemovirus rymv Rice Yellow Mottle Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Sobemovirus cnmov Cynosurus Mottle Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Sobemovirus cmmv Cocksfoot Mild Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Sminthurus viridus lucerne flea arthropod springtail not present low USDA Plant/Pest
Sminthopsis spp. Narrow-footed marsupial mouse vertebrate mammal VALUE REQUIRED VALUE REQUIRED OR ISC Worst 100
Sitodiplosis mosellana wheat midge arthropod fly limited n/a (already in CA) CDFA (reg. A)
Siteroptes graminum grass mite arthropod mite limited n/a (already in CA) CDFA (reg. B)
Sisymbrium irio London rocket plant herbaceous widespread n/a (already in CA) Cal-IPC list
Sirococcus clavigignenti-juglandacearum Butternut Canker disease fungus not present low ISSG Global InvS
Sirex noctilio sirex woodwasp arthropod bee, wasp not present moderate CDFA (reg. A)
Sinoxylon anale dunnage beetle arthropod beetle not present high CDFA (reg. A)
Singhiella simplex Fig whitefly arthropod scale, aphid not present moderate FL Dept. of Ag
Sinapis arvensis wild mustard plant herbaceous widespread n/a (already in CA) Cal-IPC list
Silybum marianum blessed milkthistle plant herbaceous widespread n/a (already in CA) Cal-IPC list
Silene latifolia ssp. alba bladder campion plant herbaceous limited n/a (already in CA) WA Weed List
Sicalis flaveola Saffron finch vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Setaria viridis green bristlegrass plant grass widespread n/a (already in CA) Weeds of CA
Setaria pumila ssp. pallidefusca cattail grass plant grass not present moderate USDA Plant/Pest
Setaria pumila yellow foxtail plant grass widespread n/a (already in CA) Weeds of CA
Setaria faberi giant foxtail plant grass widespread n/a (already in CA) CDFA
Sesbania punicea red sesbania plant woody limited n/a (already in CA) Cal-IPC list
Sesamia cretica durra stalk borer arthropod butterfly, moth not present moderate CDFA (reg. A)
Serrasalminae Piranha vertebrate fish not present high FL FWCC NNS List
Serinus mozambicus Yellow-fronted canary vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Serinus canaria Common canary vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Septoria melanosa Elenk fungus disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Senna obtusifolia sicklepod plant herbaceous limited n/a (already in CA) CDFA
Senecio vulgaris old-man-in-the-spring plant herbaceous widespread n/a (already in CA) Weeds of CA
Senecio squalidus Oxford ragwort plant herbaceous not present low CDFA
Senecio madagascariensis Madagascar ragwort plant herbaceous not present moderate USDA Plant/Pest
Senecio linearifolius narrowleaf ragwort plant herbaceous not present low CDFA
Senecio jacobaea tansy ragwort plant herbaceous limited n/a (already in CA) CDFA
Senecio inaequidens South African ragwort plant woody not present low USDA Plant/Pest
Selenothrips rubrocinctus redbanded thrips arthropod thrips not present high CDFA (reg. A)
Selenaspidus articulatus rufous scale arthropod scale, aphid not present moderate CDFA (reg. A)
Secale cereale cereal rye plant grass widespread n/a (already in CA) WA Weed List
Scrobipalpa ocellatella surgarbeet crown borer arthropod butterfly, moth not present low CDFA (reg. A)
Scotinophara lurida rice stinkbug arthropod scale, aphid not present high CDFA (reg. A)
Scolymus hispanicus golden thistle plant herbaceous limited n/a (already in CA) CDFA
Sclerophthora rayssiae var. zeae Brown Stripe Downy Mildew of Maize disease fungus not present moderate APHIS OPIS
Sciurus vulgaris Red squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Sciurus niger Fox squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED ISSG 100WorstIAS
Sciurus carolinensis Gray squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED ISSG 100WorstIAS
Sciurus aureogaster Mexican red-bellied squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Sciurus aberti Abert’s squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Scirtothrips dorsalis (Hood) Chilli thrips arthropod thrips not present high NAPPA Phyto
Schlerophthora rayssiae var zeae Brown Stripe Downy mildew of corn/Select Agent disease oomycete not present VALUE REQUIRED No list
Schizoporella unicornis Single horn bryozoan invertebrate other limited n/a (already in CA) IMEAC
Schismus barbatus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Schismus arabicus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Schinus terebinthifolius Brazilian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Schinus molle Peruvian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Scardinius erythropthalmus Rudd vertebrate fish not present high Harmful U.S. NIS
Scapteriscus borellii southern mole cricket arthropod grasshopper, cricket limited n/a (already in CA) CDFA (reg. B)