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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
Quince Yellow Blotch Agent Quince Yellow Blotch Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Radopholus similis Burrowing Nematode invertebrate nematode not present moderate CDFA (reg. A)
Raffaelea lauricola Laurel Wilt Disease disease fungus not present moderate National IS Info
Ralstonia solanacearum Bacterial wilt disease bacterium not present VALUE REQUIRED NAPPO
Ralstonia solanacearum race 3 biovar 2 Geranium Bacterial Wilt/Select Agent disease bacterium not present VALUE REQUIRED NAPPO
Ramphotyphlops braminus Brahminy blind snake vertebrate reptile VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Rana berlandieri Rio Grande leopard frog vertebrate amphibian VALUE REQUIRED VALUE REQUIRED DFG Code 2118
Rana catesbeiana American bullfrog vertebrate amphibian widespread n/a (already in CA) Cal Code 14:671
Rana clamitans Green frog vertebrate amphibian VALUE REQUIRED VALUE REQUIRED Witmer et al
Ranunculus acris tall buttercup plant herbaceous limited n/a (already in CA) MT Weed List
Ranunculus repens creeping buttercup plant herbaceous widespread n/a (already in CA) Cal-IPC list
Raoiella indica Red Palm Mite    arthropod mite not present high CDFA (reg. A)
Raphanus raphanistrum wild radish plant herbaceous widespread n/a (already in CA) Weeds of CA
Raphanus sativus radish plant herbaceous widespread n/a (already in CA) Cal-IPC list
Rattus exulans Polynesian rat vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Rattus norvegicus Norway rat vertebrate mammal widespread n/a (already in CA) Cal Code 14:671
Rattus rattus Ship rat vertebrate mammal widespread n/a (already in CA) Cal Code 14:671
Reoviridae-related pathogenic virus (REO-III, REO-IV) Reo-like viruses disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Retama monosperma bridal broom plant woody limited n/a (already in CA) CDFA
Rhabdoscelus obscurus New Guinea sugarcane weevil arthropod beetle not present moderate USDA Plant/Pest
Rhabdovirus aev Alfalfa Enation Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
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
Rhadinovirus aihv-1 Alcelaphine herpesvirus 1 disease virus VALUE REQUIRED VALUE REQUIRED Chavarria NRDC
Rhagoletis boycei walnut husk fly arthropod fly not present moderate CDFA (reg. A)
Rhagoletis cerasi European cherry fruit fly arthropod fly not present low CDFA (reg. A)
Rhagoletis cingulata cherry fruit fly arthropod fly not present moderate CDFA (reg. A)
Rhagoletis fausta black cherry fruit 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 juglandis walnut husk fly arthropod fly not present moderate CDFA (reg. A)
Rhagoletis mendax blueberry maggot arthropod fly not present moderate CDFA (reg. A)
Rhagoletis pomonella apple maggot arthropod fly widespread n/a (already in CA) CDFA (reg. B)
Rhagoletis spp. exotic fruit fly arthropod fly unknown moderate CDFA (reg. A)
Rhagoletis suavis walnut husk fly arthropod fly not present moderate CDFA (reg. A)
Rhizotrogus majalis European chafer arthropod beetle not present moderate CDFA (reg. A)
Rhopalomyzus poae grass aphid arthropod scale, aphid widespread n/a (already in CA) CDFA (reg. B)
Rhyacionia buoliana European pine shoot moth arthropod butterfly, moth not present high CDFA (reg. A)
Rhyacionia frustrana Nantucket pine tip moth arthropod butterfly, moth limited n/a (already in CA) CDFA (reg. B)
Rhynchophorus ferrugineus red palm weevil arthropod beetle not present high CDFA (reg. A)
Ricinus communis castorbean plant herbaceous widespread n/a (already in CA) Cal-IPC list
Robinia pseudoacacia black locust plant woody limited n/a (already in CA) Cal-IPC list
Rorippa austriaca Austrian field cress plant herbaceous limited n/a (already in CA) CDFA
Rorippa sylvestris creeping yellow field cress plant herbaceous limited n/a (already in CA) CDFA
Rosellinia necratrix Dematophora Root Rot disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Rottboellia cochinchinensis itchgrass plant grass not present moderate USDA Plant/Pest
Rotylenchulus reniformis Reniform Nematode invertebrate nematode not present moderate CDFA (reg. A)
Rubus armeniacus Himalaya blackberry plant woody widespread n/a (already in CA) CDFA
Rubus moluccanus wild raspberry plant woody not present low USDA Plant/Pest
Rumex acetosella red sorrel plant herbaceous widespread n/a (already in CA) Cal-IPC list
Rumex crispus curly dock plant herbaceous widespread n/a (already in CA) Cal-IPC list
Rupicapra rupicapra Chamois vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Rymovirus bstv Brome Streak Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Saccharicoccus sacchari pink sugarcane mealybug arthropod scale, aphid not present moderate CDFA (reg. A)
Saccharum ravennae ravennagrass plant grass limited n/a (already in CA) Cal-IPC list
Saccharum spontaneum wild sugarcane plant grass not present low USDA Plant/Pest
Sagittaria graminea grass-leaved arrowhead plant herbaceous not present high WA Weed List
Sagittaria sagittifolia arrowhead plant herbaceous not present low USDA Plant/Pest
Saimiri sciureus Squirrel monkey vertebrate mammal VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Salsola collina spineless Russian thistle plant herbaceous not present high CDFA
Salsola paulsenii barbwire 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 tragus Russian-thistle plant herbaceous widespread n/a (already in CA) CDFA
Salsola vermiculata wormleaf salsola plant herbaceous not present low CDFA
Salvia aethiopis Mediterranean sage plant herbaceous limited n/a (already in CA) CDFA
Salvia pratensis meadow clary plant herbaceous not present moderate WA Weed List
Salvia sclarea clary sage plant herbaceous not present moderate WA Weed List
Salvia virgata southern meadow sage plant herbaceous not present moderate CDFA
Salvinia auriculata giant salvinia plant herbaceous not present low USDA Plant/Pest
Salvinia biloba giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia herzogii giant salvinia plant herbaceous limited n/a (already in CA) USDA Plant/Pest
Salvinia molesta giant salvinia plant herbaceous limited n/a (already in CA) Cal-IPC list
Sampaguita Yellow Ringspot Mosaic Agent Sampaguita Yellow Ringspot Mosaic Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Sannina uroceriformis persimmon borer arthropod butterfly, moth not present moderate CDFA (reg. A)
Sapium sebiferum Chinese tallowtree plant woody limited n/a (already in CA) Cal-IPC list
Saponaria officinalis bouncingbet plant herbaceous limited n/a (already in CA) Cal-IPC list
Sargassum horneri Asian seaweed plant algae limited moderate Hoffman NOAA
Sargassum muticum Sargassum muticum plant algae limited low Hoffman NOAA
Satsuma dwarf virus, Sadwa virus SDV Satsuma dwarf virus disease virus not present VALUE REQUIRED No list
Scapteriscus borellii southern mole cricket arthropod grasshopper, cricket limited n/a (already in CA) CDFA (reg. B)
Scardinius erythropthalmus Rudd vertebrate fish not present high Harmful U.S. NIS
Schinus molle Peruvian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Schinus terebinthifolius Brazilian peppertree plant woody limited n/a (already in CA) Cal-IPC list
Schismus arabicus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Schismus barbatus mediterraneangrass plant grass widespread n/a (already in CA) Cal-IPC list
Schizoporella unicornis Single horn bryozoan invertebrate other limited n/a (already in CA) IMEAC
Schlerophthora rayssiae var zeae Brown Stripe Downy mildew of corn/Select Agent disease oomycete not present VALUE REQUIRED No list
Scirtothrips dorsalis (Hood) Chilli thrips arthropod thrips not present high NAPPA Phyto
Sciurus aberti Abert’s squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Sciurus aureogaster Mexican red-bellied squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Sciurus carolinensis Gray squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED ISSG 100WorstIAS
Sciurus niger Fox squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED ISSG 100WorstIAS
Sciurus vulgaris Red squirrel vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Sclerophthora rayssiae var. zeae Brown Stripe Downy Mildew of Maize disease fungus not present moderate APHIS OPIS
Scolymus hispanicus golden thistle plant herbaceous limited n/a (already in CA) CDFA
Scotinophara lurida rice stinkbug arthropod scale, aphid not present high CDFA (reg. A)
Scrobipalpa ocellatella surgarbeet crown borer arthropod butterfly, moth not present low CDFA (reg. A)
Secale cereale cereal rye plant grass widespread n/a (already in CA) WA Weed List
Selenaspidus articulatus rufous scale arthropod scale, aphid not present moderate CDFA (reg. A)
Selenothrips rubrocinctus redbanded thrips arthropod thrips not present high CDFA (reg. A)
Senecio inaequidens South African ragwort plant woody not present low USDA Plant/Pest