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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
Satsuma dwarf virus, Sadwa virus SDV Satsuma dwarf virus disease virus not present VALUE REQUIRED No list
Sargassum muticum Sargassum muticum plant algae limited low Hoffman NOAA
Sargassum horneri Asian seaweed plant algae limited moderate Hoffman NOAA
Saponaria officinalis bouncingbet plant herbaceous limited n/a (already in CA) Cal-IPC list
Sapium sebiferum Chinese tallowtree plant woody limited n/a (already in CA) Cal-IPC list
Sannina uroceriformis persimmon borer arthropod butterfly, moth not present moderate CDFA (reg. A)
Sampaguita Yellow Ringspot Mosaic Agent Sampaguita Yellow Ringspot Mosaic Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Salvinia molesta giant salvinia plant herbaceous limited n/a (already in CA) Cal-IPC list
Salvinia herzogii giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia biloba giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia auriculata giant salvinia plant herbaceous not present low USDA Plant/Pest
Salvia virgata southern meadow sage plant herbaceous not present moderate CDFA
Salvia sclarea clary sage plant herbaceous not present moderate WA Weed List
Salvia pratensis meadow clary plant herbaceous not present moderate WA Weed List
Salvia aethiopis Mediterranean sage plant herbaceous limited n/a (already in CA) CDFA
Salsola vermiculata wormleaf salsola plant herbaceous not present low CDFA
Salsola tragus Russian-thistle plant herbaceous widespread n/a (already in CA) CDFA
Salsola soda oppositeleaf Russian thistle plant herbaceous limited n/a (already in CA) Cal-IPC list
Salsola paulsenii barbwire Russian-thistle plant herbaceous widespread n/a (already in CA) CDFA
Salsola collina spineless Russian thistle plant herbaceous not present high CDFA
Saimiri sciureus Squirrel monkey vertebrate mammal VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Sagittaria sagittifolia arrowhead plant herbaceous not present low USDA Plant/Pest
Sagittaria graminea grass-leaved arrowhead plant herbaceous not present high WA Weed List
Saccharum spontaneum wild sugarcane plant grass not present low USDA Plant/Pest
Saccharum ravennae ravennagrass plant grass limited n/a (already in CA) Cal-IPC list
Saccharicoccus sacchari pink sugarcane mealybug arthropod scale, aphid not present moderate CDFA (reg. A)
Rymovirus bstv Brome Streak Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Rupicapra rupicapra Chamois vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Rumex crispus curly dock plant herbaceous widespread n/a (already in CA) Cal-IPC list
Rumex acetosella red sorrel plant herbaceous widespread n/a (already in CA) Cal-IPC list
Rubus moluccanus wild raspberry plant woody not present low USDA Plant/Pest
Rubus armeniacus Himalaya blackberry plant woody widespread n/a (already in CA) CDFA
Rotylenchulus reniformis Reniform Nematode invertebrate nematode not present moderate CDFA (reg. A)
Rottboellia cochinchinensis itchgrass plant grass not present moderate USDA Plant/Pest
Rosellinia necratrix Dematophora Root Rot disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Rorippa sylvestris creeping yellow field cress plant herbaceous limited n/a (already in CA) CDFA
Rorippa austriaca Austrian field cress plant herbaceous limited n/a (already in CA) CDFA
Robinia pseudoacacia black locust plant woody limited n/a (already in CA) Cal-IPC list
Ricinus communis castorbean plant herbaceous widespread n/a (already in CA) Cal-IPC list
Rhynchophorus ferrugineus red palm weevil arthropod beetle not present high CDFA (reg. A)
Rhyacionia frustrana Nantucket pine tip moth arthropod butterfly, moth limited n/a (already in CA) CDFA (reg. B)
Rhyacionia buoliana European pine shoot moth arthropod butterfly, moth not present high CDFA (reg. A)
Rhopalomyzus poae grass aphid arthropod scale, aphid widespread n/a (already in CA) CDFA (reg. B)
Rhizotrogus majalis European chafer arthropod beetle not present moderate CDFA (reg. A)
Rhagoletis suavis walnut husk fly arthropod fly not present moderate CDFA (reg. A)
Rhagoletis spp. exotic fruit fly arthropod fly unknown moderate CDFA (reg. A)
Rhagoletis pomonella apple maggot arthropod fly widespread n/a (already in CA) CDFA (reg. B)
Rhagoletis mendax blueberry maggot arthropod fly not present moderate CDFA (reg. A)
Rhagoletis juglandis walnut husk fly arthropod fly not present moderate CDFA (reg. A)
Rhagoletis indifferens western cherry fruit fly arthropod fly limited n/a (already in CA) CDFA (reg. A)
Rhagoletis fausta black cherry fruit fly arthropod fly not present moderate CDFA (reg. A)
Rhagoletis cingulata cherry fruit fly arthropod fly not present moderate CDFA (reg. A)
Rhagoletis cerasi European cherry fruit fly arthropod fly not present low CDFA (reg. A)
Rhagoletis boycei walnut husk fly arthropod fly not present moderate CDFA (reg. A)
Rhadinovirus aihv-1 Alcelaphine herpesvirus 1 disease virus VALUE REQUIRED VALUE REQUIRED Chavarria NRDC
Rhacodiella vitis Chestnut rot disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Rhacodiella vitis Sterenberg fungus disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Rhabdovirus aev Alfalfa Enation Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Rhabdoscelus obscurus New Guinea sugarcane weevil arthropod beetle not present moderate USDA Plant/Pest
Retama monosperma bridal broom plant woody limited n/a (already in CA) CDFA
Reoviridae-related pathogenic virus (REO-III, REO-IV) Reo-like viruses disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Rattus rattus Ship rat vertebrate mammal widespread n/a (already in CA) Cal Code 14:671
Rattus norvegicus Norway rat vertebrate mammal widespread n/a (already in CA) Cal Code 14:671
Rattus exulans Polynesian rat vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Raphanus sativus radish plant herbaceous widespread n/a (already in CA) Cal-IPC list
Raphanus raphanistrum wild radish plant herbaceous widespread n/a (already in CA) Weeds of CA
Raoiella indica Red Palm Mite    arthropod mite not present high CDFA (reg. A)
Ranunculus repens creeping buttercup plant herbaceous widespread n/a (already in CA) Cal-IPC list
Ranunculus acris tall buttercup plant herbaceous limited n/a (already in CA) MT Weed List
Rana clamitans Green frog vertebrate amphibian VALUE REQUIRED VALUE REQUIRED Witmer et al
Rana catesbeiana American bullfrog vertebrate amphibian widespread n/a (already in CA) Cal Code 14:671
Rana berlandieri Rio Grande leopard frog vertebrate amphibian VALUE REQUIRED VALUE REQUIRED DFG Code 2118
Ramphotyphlops braminus Brahminy blind snake vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Ralstonia solanacearum race 3 biovar 2 Geranium Bacterial Wilt/Select Agent disease bacterium not present VALUE REQUIRED NAPPO
Ralstonia solanacearum Bacterial wilt disease bacterium not present VALUE REQUIRED NAPPO
Raffaelea lauricola Laurel Wilt Disease disease fungus not present moderate National IS Info
Radopholus similis Burrowing Nematode invertebrate nematode not present moderate CDFA (reg. A)
Quince Yellow Blotch Agent Quince Yellow Blotch Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Quince Sooty Ringspot Agent Quince Sooty Ringspot Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Quelea quelea Red-billed quelea vertebrate bird not present low Cal Code 14:671
Quadrastichus erythrinae Erythrnia gall wasp arthropod bee, wasp not present high FL Dept. of Ag
Quadraspidiotus ostreaeformis European fruit scale arthropod scale, aphid not present high CDFA (reg. A)
Python molurus Burmese python vertebrate reptile not present moderate Cal Code 14:671
Pyricularia grisea Rice Blast disease fungus limited n/a (already in CA) APSNet
Pyracantha crenulata pyracantha plant woody limited n/a (already in CA) Cal-IPC list
Pyracantha coccinea pyracantha plant woody limited n/a (already in CA) Cal-IPC list
Pyracantha angustifolia pyracantha plant woody limited n/a (already in CA) Cal-IPC list
Pycnonotus jocosus Red-whiskered bulbul vertebrate bird limited n/a (already in CA) CDFA Vert List
Pycnonotus caferi Red-vented bulbul vertebrate bird VALUE REQUIRED VALUE REQUIRED ISSG 100WorstIAS
Pulvinaria urbicola urban soft scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Pulvinaria psidii green shield scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Pueraria montana var. lobata kudzu plant herbaceous not present moderate OR Weed List
Pucciniastrum areolatum Cherry-Spruce Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pucciniastrum actinidae Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Puccinia striiformis Wheat stripe rust disease fungus widespread n/a (already in CA) National IS Info
Puccinia mccleanii Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Puccinia horiana Chrysanthemum White Rust disease fungus limited n/a (already in CA) CACASA
Puccinia graminis f. sp. tritici Wheat stem rust (Uganda 99 strain)/Black rust disease fungus not present moderate National IS Info
Pteropus spp. Flying fox vertebrate mammal not present low Cal Code 14:671
Pterocles exustus Chestnut-bellied sandgrouse vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al