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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 Name Common Namesort icon Type Subtype Extent Risk of Introduction First Source
Dreissena polymorpha Zebra mussels invertebrate aquatic mollusk, freshwater limited n/a (already in CA) CAISMP
Cataenococcus olivaceus yucca mealybug arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Lomentaria hakodatensis yendo plant algae VALUE REQUIRED VALUE REQUIRED Hoffman NOAA
Alyssum murale yellowtuft plant herbaceous not present moderate OR Weed List
Alyssum corsicum yellowtuft plant herbaceous not present moderate OR Weed List
Cirsium ochrocentrum yellowspine thistle plant herbaceous limited n/a (already in CA) CDFA
Unknown pathogeic coronavirus- and arterivirus-like virus Yellowhead disease of shrimp disease virus VALUE REQUIRED VALUE REQUIRED No list
Cichlasoma salvini Yellowbelly cichlid vertebrate fish not present low Cal Code 14:671
Gonatodes albogularis Yellow-headed gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Amazona oratrix Yellow-headed Amazon vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Serinus mozambicus Yellow-fronted canary vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Tiaris olivacea Yellow-faced grassquit vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Amazona ochrocephula Yellow-crowned Amazon vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Paroaria capitata Yellow-billed cardinal vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Linaria vulgaris yellow toadflax plant herbaceous limited n/a (already in CA) Cal-IPC list
Centaurea solstitialis yellow starthistle plant herbaceous widespread n/a (already in CA) CDFA
Hemileia vastatrix Yellow ring mosaic agent (assoc. with Jasminum) disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Conogethes punctiferalis yellow peach moth arthropod butterfly, moth not present moderate USDA Plant/Pest
Hieracium caespitosum yellow hawkweed plant herbaceous not present high ID Weed List
Parentucellia viscosa yellow glandweed plant herbaceous limited n/a (already in CA) Cal-IPC list
Setaria pumila yellow foxtail plant grass widespread n/a (already in CA) Weeds of CA
Nymphoides peltata yellow floating heart plant herbaceous limited n/a (already in CA) OR Weed List
Flavivirus 3 Yellow Fever disease virus VALUE REQUIRED VALUE REQUIRED CIDRAP
Hieracium x floribundum yellow devil hawkweed plant herbaceous not present moderate MT Weed List
Salsola vermiculata wormleaf salsola plant herbaceous not present low CDFA
Carthamus lanatus woolly distaff thistle plant herbaceous widespread n/a (already in CA) CDFA
Ceratocystis novae-zelandiae wood-staining disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Ophiostoma pluriannulatum Wood stain disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Ischnoderma rosulata Wood decay disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Phlebia chrysocrea Wood decay disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Trametes versicolor Wood decay disease fungus VALUE REQUIRED VALUE REQUIRED USDA pest
Striga asiatica witchweed plant herbaceous not present moderate CDFA
Striga spp. witchweed plant herbaceous not present high USDA Plant/Pest
Crinipellis perniciosa Witches Broom Fungus in cocoa disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Candidatus phytoplasma Witches broom disease of lime disease phytoplasma not present VALUE REQUIRED APHIS OPIS
Spermacoce alata winged false buttonweed plant herbaceous not present low USDA Plant/Pest
Brenneria salicis Willow Watermark Disease disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Saccharum spontaneum wild sugarcane plant grass not present low USDA Plant/Pest
Carthamus oxyacantha wild safflower plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Rubus moluccanus wild raspberry plant woody not present low USDA Plant/Pest
Raphanus raphanistrum wild radish plant herbaceous widespread n/a (already in CA) Weeds of CA
Panicum miliaceum wild proso millet plant grass limited n/a (already in CA) CO Weed List
Avena fatua wild oat plant grass widespread n/a (already in CA) Cal-IPC list
Sinapis arvensis wild mustard plant herbaceous widespread n/a (already in CA) Cal-IPC list
Tagetes minuta wild marigold plant herbaceous not present moderate CDFA
Allium vineale wild garlic plant herbaceous limited n/a (already in CA) CDFA
Mirabilis nyctaginea wild four o-clock plant herbaceous limited n/a (already in CA) WA Weed List
Anthriscus sylvestris wild chervil plant herbaceous not present high WA Weed List
Daucus carota wild carrot plant herbaceous widespread n/a (already in CA) WA Weed List
Carum carvi wild caraway plant herbaceous not present high CO Weed List
Erodium moschatum whitestem filaree plant herbaceous widespread n/a (already in CA) Weeds of CA
Carthamus leucocaulos whitestem distaff thistle plant herbaceous not present moderate CDFA
Orgyia leucostigma whitemarked tussock moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Naupactus spp. whitefringed beetles arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Naupactus leucoloma whitefringed beetle arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Lagopus leucurus White-tailed ptarmigan vertebrate bird VALUE REQUIRED VALUE REQUIRED No list
Lepus townsendii White-tailed jackrabbit vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Copsychus malabaricus White-rumped shama vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Nasua narica White-nosed coati vertebrate mammal VALUE REQUIRED VALUE REQUIRED CDFA Vert List
Geomyces sp. White-Nose Syndrome of bats disease fungus not present low National IS Info
Solanum marginatum white-margined nightshade plant woody limited n/a (already in CA) CDFA
Cacatua alba White-crested cockatoo vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Bactrocera albistrigata White Striped Fruit Fly arthropod fly not present low CDFA (reg. A)
Baculovirus complex WSBV White Spot Syndrome Baculovirus Complex of fish disease virus VALUE REQUIRED VALUE REQUIRED No list
Stereum hiugense White Rot disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Cronartium ribicola White pine blister rust disease fungus limited n/a (already in CA) ForestPests.org
Pseudaulacaspis pentagona white peach scale arthropod scale, aphid not present high CDFA (reg. A)
Marrubium vulgare white horehound plant herbaceous widespread n/a (already in CA) Cal-IPC list
Phyllophaga spp. white grubs arthropod beetle limited n/a (already in CA) USDA Plant/Pest
Phytalus spp. white grubs arthropod beetle limited n/a (already in CA) USDA Plant/Pest
Holotrichia mindanaona white grub arthropod beetle not present moderate USDA Plant/Pest
Bryonia alba white bryony plant herbaceous not present moderate WA Weed List
Morone chrysops White bass vertebrate fish limited n/a (already in CA) Cal Code 14:671
Unknown pathogenic bacterium Wheat Yellowing Stripe Bacterium disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Closterovirus wylv or Prosopis fiebrigii ? Wheat Yellow Leaf Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Prosopis fiebrigii or Closterovirus wylv ? Wheat Yellow Leaf Virus disease virus VALUE REQUIRED VALUE REQUIRED No list
Puccinia striiformis Wheat stripe rust disease fungus widespread n/a (already in CA) National IS Info
Puccinia graminis f. sp. tritici Wheat stem rust (Uganda 99 strain)/Black rust disease fungus not present moderate National IS Info
Tilletia tritici (caries) Wheat smut disease fungus not present moderate EPPO
Sitodiplosis mosellana wheat midge arthropod fly limited n/a (already in CA) CDFA (reg. A)
Solanum tampicense wetland nightshade plant woody not present low USDA Plant/Pest
Lacerta bilineata Western green lacerta vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Harrisina brillians western grapeleaf skeletonizer arthropod butterfly, moth widespread n/a (already in CA) CDFA (reg. B)
Diabrotica virgifera virgifera western corn rootworm arthropod beetle not present high CDFA (reg. A)
Rhagoletis indifferens western cherry fruit fly arthropod fly limited n/a (already in CA) CDFA (reg. A)
Flavivirus 2 West Nile Virus disease virus widespread n/a (already in CA) Iowa State Univ
Anastrepha obliqua West Indian fruit fly arthropod fly not present moderate CDFA (reg. A)
Gerstaeckeria nobilis weevil arthropod beetle not present moderate CDFA (reg. A)
Hyperoides humilis weevil arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Glyceria declinata waxy mannagrass plant grass limited n/a (already in CA) Cal-IPC list
Cirsium undulatum wavyleaf thistle plant herbaceous limited n/a (already in CA) CDFA
Gaura sinuata wavy-leaved gaura plant herbaceous limited n/a (already in CA) CDFA
Palea steindachneri Wattle-necked softshell vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Moniliophthora roreri Watery Pod Rot disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Erwinia salicis Watermark Disease disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Trapa natans water-chestnut plant herbaceous not present moderate AZ Weed List
Ludwigia peruviana water primrose plant herbaceous not present moderate CDFA
Eichhornia crassipes water hyacinth plant herbaceous widespread n/a (already in CA) Cal-IPC list
Trapa bicornis water caltrap plant herbaceous not present low WA Weed List
Lonchura malabarica Warbling silverbill vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al