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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
Symphytum asperum rough comfrey plant herbaceous limited n/a (already in CA) CDFA
Synchytrium endobioticum Potato Wart/Select Agent disease fungus not present low EPPO
Syngrapha epigaea inscribed looper moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Syrmaticus reevesii Reeve’s pheasant vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Taeniatherum caput-medusae medusahead plant grass widespread n/a (already in CA) CDFA
Tagetes minuta wild marigold plant herbaceous not present moderate CDFA
Tamarix aphylla athel tamarisk plant woody limited n/a (already in CA) Cal-IPC list
Tamarix chinensis salt cedar plant woody limited n/a (already in CA) CO Weed List
Tamarix parviflora smallflower tamarisk plant woody widespread n/a (already in CA) Cal-IPC list
Tamarix ramosissima saltcedar plant woody widespread n/a (already in CA) Cal-IPC list
Tanacetum vulgare common tansy plant herbaceous limited n/a (already in CA) Cal-IPC list
Tarentola annularis Ringed wall gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Tarentola mauritanica Moorish gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Tenuivirus ewsmv European Wheat Striate Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tenuivirus mmcsv Maize Mottle/Chlorotic Stunt Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tenuivirus rwsv Rice Wilted Stunt Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Teredo barstschi Shipworm invertebrate aquatic mollusk, marine VALUE REQUIRED VALUE REQUIRED IMEAC
Tetragallus himalayensis Himalayan snowcock vertebrate bird VALUE REQUIRED VALUE REQUIRED Harmful U.S. NIS
Tetraleurodes spp. redbanded whitefly arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Tetranychus evansi red spider mite arthropod mite limited n/a (already in CA) CDFA (reg. B)
Thaumatotibia leucotreta False codling moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Thecaphora (Angiosorus) solani Potato smut disease fungus not present low EPPO
Threskiornis aetheopicus Sacred Ibis vertebrate bird not present high Cal Code 14:671
Thrips angusticeps cabbage thrips arthropod thrips not present high CDFA (reg. A)
Thrips florum banana flower thrips arthropod thrips not present high CDFA (reg. A)
Thrips palmi melon thrips arthropod thrips not present high CDFA (reg. A)
Thymelaea passerina spurge flax plant herbaceous not present moderate WA Weed List
Thyridopteryx ephemeraeformis bagworm arthropod butterfly, moth not present high CDFA (reg. A)
Tiaris olivacea Yellow-faced grassquit vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Tildenia gudmannella pepper flower bud moth arthropod butterfly, moth not present moderate CDFA (reg. A)
Tilletia (neovossia) indica Karnal bunt disease fungus limited n/a (already in CA) EPPO
Tilletia tritici (caries) Wheat smut disease fungus not present moderate EPPO
Tipula oleracea common crane fly arthropod fly not present low CDFA (reg. B)
Tipula paludosa European crane fly arthropod fly limited n/a (already in CA) CDFA (reg. B)
Tischeria marginata moth arthropod butterfly, moth not present low CDFA (reg. A)
Tomato Yellow Leaf Curl Sardinia Virus, TYLCSV Tomato Yellow Leaf Curl Sardinia Virus disease virus not present VALUE REQUIRED No list
Tombusviridae of unknown genus Chlorotic Ringspot Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tombusvirus galv Grapevine Algerian Latent Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tomicus piniperda pine shoot beetle arthropod beetle not present high CDFA (reg. A)
Torilis arvensis hedgeparsley plant herbaceous widespread n/a (already in CA) Cal-IPC list
Tospovirus cacv Capsicum chlorosis virus disease virus not present VALUE REQUIRED No list
Tospoviruses Tomato spot wilt virus disease virus limited VALUE REQUIRED APHIS OPIS
Toumeyella liriodendri tuliptree scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Toxoptera citricida Brown citrus aphid arthropod scale, aphid not present high CDFA (reg. A)
Toxotrypana curvicauda papaya fruit fly arthropod fly not present moderate CDFA (reg. A)
Trachemys scripta elegans Red-eared slider vertebrate reptile limited n/a (already in CA) Cal Code 14:671
Trachysphaera fructigena Mealy Pod Diseases of Cushy Gall Disease disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Trametes versicolor Wood decay disease fungus VALUE REQUIRED VALUE REQUIRED USDA pest
Tranes internatus macrozamia borer arthropod beetle limited n/a (already in CA) CDFA (reg. B)
Trapa bicornis water caltrap plant herbaceous not present low WA Weed List
Trapa natans water-chestnut plant herbaceous not present moderate AZ Weed List
Trialeurodes floridensis avocado whitefly arthropod scale, aphid not present high CDFA (reg. A)
Tribulus terrestris puncturevine plant herbaceous widespread n/a (already in CA) CDFA
Trichodinella epizootica Protozoic parasite of fish invertebrate nematode VALUE REQUIRED VALUE REQUIRED No list
Trichosurus vulpecula Brush-tailed possum vertebrate mammal not present low Lacey Act
Trichovirus aclsv Apple Chlorotic Leafspot Virus disease virus VALUE REQUIRED VALUE REQUIRED No list
Trichovirus crmv Cherry Rusty Mottle Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Trichovirus ginv Grapevine Berry Inner Necrosis Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Trichovirus pvt Potato Virus T disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Trichovirus spp Quince Stunt Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tridax procumbens coat buttons plant herbaceous not present low USDA Plant/Pest
Trifolium hirtum rose clover plant herbaceous widespread n/a (already in CA) Cal-IPC list
Trionyx spiniferus Spiny softshell vertebrate reptile VALUE REQUIRED n/a (already in CA) DFG Code 2118
Trioza erytreae African citrus psyllid arthropod scale, aphid limited n/a (already in CA) CDFA (reg. A)
Trioza tripunctata blackberry psyllid arthropod scale, aphid not present moderate CDFA (reg. A)
Triphragmiopsis laricinum Brown Needle Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tripleurospermum perforatum scentless false mayweed plant herbaceous not present low CO Weed List
Trogoderma granarium khapra beetle arthropod beetle not present moderate CDFA (reg. A)
Tropilaelaps clareae honeybee mite arthropod mite not present high USDA Plant/Pest
Tupinambis merianae Argentina giant tegu vertebrate reptile not present high Cal Code 14:671
Tussilago farfara coltsfoot plant herbaceous not present moderate OR Weed List
Tylenchulus semipenetrans citrus nematode invertebrate nematode widespread n/a (already in CA) CDFA (reg. C)
Tymovirus (?) Citrus sudden death n/a probably Tymovirus disease virus not present VALUE REQUIRED No list
Tymovirus aplv Andean Potato Latent Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tymovirus cymv Cocoa Yellow Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tymovirus dmv Dulcamara Mottle Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Tymovirus okmv Okra Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Typophorus nigritus viridicyaneus sweetpotato leaf beetle arthropod beetle not present moderate CDFA (reg. A)
Ulex europaeus gorse plant woody limited n/a (already in CA) CDFA
Ulmus pumila Siberian elm plant woody limited n/a (already in CA) Med. plants list
Umbravirus grv Groundnut Rosette Viruses disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unaspis citri citrus snow scale arthropod scale, aphid not present moderate CDFA (reg. A)
Unaspis euonymi euonymus scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Undaria pinnatifida wakame plant algae widespread n/a (already in CA) Cal-IPC list
Unknown pathogeic coronavirus- and arterivirus-like virus Yellowhead disease of shrimp disease virus VALUE REQUIRED VALUE REQUIRED No list
Unknown pathogenic bacterium Wheat Yellowing Stripe Bacterium disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 1 Apple Rubbery Wood Phytoplasma disease phytoplasma VALUE REQUIRED VALUE REQUIRED No list
Unknown pathogenic phytoplasma 10 Sweetpotato witches broom (little leaf) disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 11 Texas phoenix palm phytoplasma disease phytoplasma not present VALUE REQUIRED No list
Unknown pathogenic phytoplasma 2 Cotton virescence disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 3 Grapevine Vergelbungskrankheit disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 4 Groundnut witches broom disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 5 Palm Lethal Yellowing Phytoplasma disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 6 Potato Marginal Flavescence disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 7 Potato Purple Top Roll disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 8 Potato witches broom disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic phytoplasma 9 Stolbur disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic virus 1 Australian lymphoidal Parvo-Like Virus of fish disease virus VALUE REQUIRED VALUE REQUIRED No list
Unknown pathogenic virus 10 Hibiscus Leaf Curl Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Unknown pathogenic virus 11 Horsechestnut Variegation Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS