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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
Apamea apamiformis riceworm arthropod butterfly, moth not present moderate CDFA (reg. A)
Phlebovirus rvfv Rift Valley Fever disease virus VALUE REQUIRED VALUE REQUIRED CIDRAP
Morbillivirus RBOK Rinderpest virus disease virus not present VALUE REQUIRED Chavarria NRDC
Psittacula krameri Ring-necked parakeet vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Pseudocheirus peregrinus Ring-tailed possum vertebrate mammal VALUE REQUIRED VALUE REQUIRED Lacey Act
Tarentola annularis Ringed wall gecko 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
Bromus diandrus ripgut brome plant grass widespread n/a (already in CA) Cal-IPC list
Capreolus capreolus Roe deer vertebrate mammal VALUE REQUIRED VALUE REQUIRED Witmer et al
Leptographium truncatum Root Disease disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Phytophthora cinnamomi Root Rot disease oomycete VALUE REQUIRED VALUE REQUIRED No list
Pratylenchus coffeae root-lesion nematode invertebrate nematode unknown moderate CDFA (reg. C)
Macrodactylus subspinosus rose chafer arthropod beetle not present high CDFA (reg. A)
Trifolium hirtum rose clover plant herbaceous widespread n/a (already in CA) Cal-IPC list
Dasineura rhodophaga rose midge arthropod fly limited n/a (already in CA) CDFA (reg. B)
Pseudopezicula tracheiphila Rotbrenner disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Hypochaeris radicata rough catsear plant herbaceous widespread n/a (already in CA) Cal-IPC list
Symphytum asperum rough comfrey plant herbaceous limited n/a (already in CA) CDFA
Aeschynomene rudis rough jointvetch plant woody limited n/a (already in CA) CDFA
Littorina saxatilis Rough periwinkle invertebrate aquatic mollusk, marine limited n/a (already in CA) Exoticsguide
Cyrtopodion scabrum Rough-tailed gecko vertebrate reptile VALUE REQUIRED VALUE REQUIRED Witmer et al
Neogobius melanostomus Round goby vertebrate fish not present moderate NISIC
Phytoplasma rus Rubus stunt disease phytoplasma VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Scardinius erythropthalmus Rudd vertebrate fish not present high Harmful U.S. NIS
Gymnocephalus cernuus Ruffe vertebrate fish not present moderate Harmful U.S. NIS
Selenaspidus articulatus rufous scale arthropod scale, aphid not present moderate CDFA (reg. A)
Chondrilla juncea rush skeletonweed plant herbaceous limited n/a (already in CA) CDFA
Acroptilon repens Russian knapweed plant herbaceous widespread n/a (already in CA) MT Weed List
Halimodendron halodendron Russian salttree plant woody not present moderate CDFA
Elaeagnus angustifolia Russian-olive plant woody limited n/a (already in CA) Cal-IPC list
Salsola tragus Russian-thistle plant herbaceous widespread n/a (already in CA) CDFA
Puccinia mccleanii Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pucciniastrum actinidae Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Uromyces gladioli Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Uromyces nyikensis Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Uromycladium tepperianum Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Gymnosporangium asiaticum Rust: Pear and Juniper disease fungus not present VALUE REQUIRED APHIS OPIS
Orconectes rusticus Rusty crayfish invertebrate crustaceans and tunicates not present high NISIC
Threskiornis aetheopicus Sacred Ibis vertebrate bird not present high Cal Code 14:671
Sicalis flaveola Saffron finch vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Brassica tournefortii Saharan mustard plant herbaceous limited n/a (already in CA) Cal-IPC list
Polygonum sachalinense Sakhalin knotweed plant herbaceous limited n/a (already in CA) CDFA
Tamarix chinensis salt cedar plant woody limited n/a (already in CA) CO Weed List
Tamarix ramosissima saltcedar 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
Cervus unicolor Sambar deer vertebrate mammal VALUE REQUIRED n/a (already in CA) FL FWCC NNS List
Sampaguita Yellow Ringspot Mosaic Agent Sampaguita Yellow Ringspot Mosaic Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Parlatoria proteus sanseveria scale arthropod scale, aphid not present high CDFA (reg. A)
Anastrepha serpentina sapote fruit fly arthropod fly limited n/a (already in CA) CDFA (reg. A)
Sargassum muticum Sargassum muticum plant algae limited low Hoffman NOAA
Leucoma salicis satin moth arthropod butterfly, moth limited n/a (already in CA) CDFA (reg. B)
Satsuma dwarf virus, Sadwa virus SDV Satsuma dwarf virus disease virus not present VALUE REQUIRED No list
Callipepla squamata Scaled quail vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Anomala foraminosa scarab beetle arthropod beetle not present low CDFA (reg. A)
Anomala insitiva scarab beetle arthropod beetle not present low CDFA (reg. A)
Anomala luteipennis scarab beetle arthropod beetle not present low CDFA (reg. A)
Anomala undulata scarab beetle arthropod beetle unknown low CDFA (reg. A)
Popillia lewisi scarab beetle arthropod beetle not present high CDFA (reg. A)
Anthemis arvensis scentless chamomile plant herbaceous limited n/a (already in CA) CO Weed List
Tripleurospermum perforatum scentless false mayweed plant herbaceous not present low CO Weed List
Gremmeniella abietina Scleroderris Canker disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Cytisus scoparius Scotch broom plant woody widespread n/a (already in CA) CDFA
Cronartium flaccidum Scotch Pine Blister Rust disease fungus not present low USDA Plant/Pest
Onopordum acanthium Scotch thistle plant herbaceous limited n/a (already in CA) CDFA
Cochliomyia hominivorax screwworm arthropod fly not present low CDFA (reg. A)
Chionaspis furfura scurfy scale arthropod scale, aphid not present high CDFA (reg. A)
Didemnum vexillum Sea squirt invertebrate crustaceans and tunicates limited n/a (already in CA) Exoticsguide
Ficopomatus enigmaticus Sea worms invertebrate other limited n/a (already in CA) Exoticsguide
Fusarium fuliginosporum Seeding Disease/seedling rot of Deodar cedar disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Poicephalus senegalus Senegal parrot vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Lespedeza cuneata sericea lespedeza plant herbaceous not present moderate CO Weed List
Euphorbia serrata serrate spurge plant herbaceous not present moderate CDFA
Nassella trichotoma serrated tussock plant grass not present low USDA Plant/Pest
Alternanthera sessilis sessile joyweed plant herbaceous not present moderate USDA Plant/Pest
Kickxia elatine sharpleaf cancerwort plant herbaceous widespread n/a (already in CA) Weeds of CA
Hemicycliophora arenaria sheath nematode invertebrate nematode unknown n/a (already in CA) CDFA (reg. A)
Capripoxvirus sppv Sheep pox virus disease virus VALUE REQUIRED VALUE REQUIRED Chavarria NRDC
Capsella bursa-pastoris shepard's purse plant herbaceous widespread n/a (already in CA) Weeds of CA
Rattus rattus Ship rat vertebrate mammal widespread n/a (already in CA) Cal Code 14:671
Teredo barstschi Shipworm invertebrate aquatic mollusk, marine VALUE REQUIRED VALUE REQUIRED IMEAC
Hirschfeldia incana shortpod mustard plant herbaceous widespread n/a (already in CA) Cal-IPC list
Lophocateres pusillus Siamese grain borer arthropod beetle not present moderate CDFA (reg. A)
Ulmus pumila Siberian elm plant woody limited n/a (already in CA) Med. plants list
Centaurea sulphurea Sicilian thistle plant herbaceous limited n/a (already in CA) CDFA
Senna obtusifolia sicklepod plant herbaceous limited n/a (already in CA) CDFA
Cervus Nippon Sika deer vertebrate mammal VALUE REQUIRED VALUE REQUIRED Harmful U.S. NIS
Hypophthalmichthys molitrix Silver Carp vertebrate fish not present moderate Cal Code 14:671
Acacia dealbata silver wattle plant woody limited n/a (already in CA) Cal-IPC list
Cotoneaster pannosus silverleaf cotoneaster plant woody limited n/a (already in CA) Cal-IPC list
Solanum elaeagnifolium silverleaf nightshade plant herbaceous limited n/a (already in CA) CDFA
Schizoporella unicornis Single horn bryozoan invertebrate other limited n/a (already in CA) IMEAC
Sirex noctilio sirex woodwasp arthropod bee, wasp not present moderate CDFA (reg. A)
Ambrosia tomentosa skeletonleaf bursage plant herbaceous not present high ID Weed List
Mephitis mephitis Skunk vertebrate mammal widespread n/a (already in CA) Cal Code 14:671
Avena barbata slender wild oat plant grass widespread n/a (already in CA) Cal-IPC list
Najas minor slender-leaved naiad plant herbaceous not present moderate WA Weed List
Carduus tenuiflorus slenderflower thistle plant herbaceous widespread n/a (already in CA) CDFA
Amaranthus hybridus slim amaranth plant herbaceous widespread n/a (already in CA) Weeds of CA
Conotrachelus aguacatae small avocado seed weevil arthropod beetle not present high USDA Plant/Pest
Orobanche minor small broomrape plant herbaceous not present high OR Weed List