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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
Pontederia cordata pickerelweed plant herbaceous not present moderate CDFA
Popillia japonica Japanese beetle arthropod beetle not present high CDFA (reg. A)
Popillia lewisi scarab beetle arthropod beetle not present high CDFA (reg. A)
Porcine herpesvirus 1 Swine pseudorabies disease virus not present VALUE REQUIRED Chavarria NRDC
Porphyrio porphyrio Purple Swamphen vertebrate bird not present high Cal Code 14:671
Portulaca oleracea common purslane plant herbaceous widespread n/a (already in CA) Weeds of CA
Potamocorbula amurensis Amur River Corbula Clam invertebrate aquatic mollusk, marine VALUE REQUIRED VALUE REQUIRED NISIC
Potamogeton crispus curlyleaf pondweed plant herbaceous widespread n/a (already in CA) Cal-IPC list
Potamopyrgus antipodarum New Zealand mudsnail invertebrate aquatic mollusk, freshwater limited n/a (already in CA) CAISMP
Potentilla recta sulfur cinquefoil plant herbaceous limited n/a (already in CA) CDFA
Potexvirus (?) or Potyvirus (?) Potato veinal necrosis virus (PVYN) disease virus VALUE REQUIRED VALUE REQUIRED No list
Potexvirus gcsv Groundnut Chlorotic Spotting Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Potos flavus Kinkajou vertebrate mammal VALUE REQUIRED VALUE REQUIRED CDFA Vert List
Potyvirus bcmv Azuki bean mosaic virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Potyvirus cdv Datura Colombian Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Potyvirus ddmv Datura Distortion Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Potyvirus demv Datura Enation Mosaic Virus disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Potyvirus ppv Plum Pox Virus disease virus not present high APHIS OPIS
Potyvirus pvv Potato Virus V disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Potyvirus pvy Potato Virus Y disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Potyviruses: Potyviridae Plum pox disease virus not present moderate APHIS OPIS
Pratylenchus coffeae root-lesion nematode invertebrate nematode unknown moderate CDFA (reg. C)
Prays endocarpa citrus pock caterpillar arthropod butterfly, moth not present low USDA Plant/Pest
Proboscidea louisianica unicorn-plant plant herbaceous widespread n/a (already in CA) WA Weed List
Proeulia spp. Proeulia spp. arthropod butterfly, moth not present low USDA Plant/Pest
Prosopis alpataco mesquite plant woody not present low USDA Plant/Pest
Prosopis argentina mesquite plant woody not present low USDA Plant/Pest
Prosopis articulata mesquite plant woody not present low USDA Plant/Pest
Prosopis burkartii mesquite plant woody not present low USDA Plant/Pest
Prosopis caldenia mesquite plant woody not present low USDA Plant/Pest
Prosopis calingastana cusqui plant woody not present low USDA Plant/Pest
Prosopis campestris mesquite plant woody not present low USDA Plant/Pest
Prosopis castellanosii mesquite plant woody not present low USDA Plant/Pest
Prosopis denudans mesquite plant woody not present low USDA Plant/Pest
Prosopis elata mesquite plant woody not present low USDA Plant/Pest
Prosopis farcta mesquite plant woody not present low USDA Plant/Pest
Prosopis ferox mesquite plant woody not present low USDA Plant/Pest
Prosopis fiebrigii mesquite plant woody not present low USDA Plant/Pest
Prosopis fiebrigii or Closterovirus wylv ? Wheat Yellow Leaf Virus disease virus VALUE REQUIRED VALUE REQUIRED No list
Prosopis hassleri mesquite plant woody not present low USDA Plant/Pest
Prosopis humilis mesquite plant woody not present low USDA Plant/Pest
Prosopis kuntzei mesquite plant woody not present low USDA Plant/Pest
Prosopis pallida mesquite plant woody not present low USDA Plant/Pest
Prosopis palmeria mesquite plant woody not present low USDA Plant/Pest
Prosopis reptans mesquite plant woody not present low USDA Plant/Pest
Prosopis rojasiana mesquite plant woody not present low USDA Plant/Pest
Prosopis ruizlealii mesquite plant woody not present low USDA Plant/Pest
Prosopis ruscifolia mesquite plant woody not present low USDA Plant/Pest
Prosopis sericantha mesquite plant woody not present low USDA Plant/Pest
Prosopis strombulifera creeping mesquite plant woody not present moderate USDA Plant/Pest
Prosopis torquata mesquite plant woody not present low USDA Plant/Pest
Prosopis velutina mesquite plant woody limited n/a (already in CA) USDA Plant/Pest
Prostephanus truncatus larger grain borer arthropod beetle not present moderate CDFA (reg. A)
Protaetia fusca mango flower beetle arthropod beetle not present moderate CDFA (reg. A)
Protaetia orientalis oriental flower beetle arthropod beetle not present moderate CDFA (reg. A)
Protopalina symphysodonis Protopalina symphysodonis infection of fish invertebrate nematode VALUE REQUIRED VALUE REQUIRED No list
Protopulvinaria pyriformis pyriform scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Prunus cerasifera cherry plum plant woody widespread n/a (already in CA) Cal-IPC list
Pseudacysta perseae avocado lace bug arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Pseudaonidia paeoniae peony scale arthropod scale, aphid not present high CDFA (reg. A)
Pseudaulacaspis cockerelli magnolia white scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. A)
Pseudaulacaspis pentagona white peach scale arthropod scale, aphid not present high CDFA (reg. A)
Pseudocercospora timorensis Sweet Potato leaf spot disease fungus VALUE REQUIRED VALUE REQUIRED USDA Plant/Pest
Pseudocheirus peregrinus Ring-tailed possum vertebrate mammal VALUE REQUIRED VALUE REQUIRED Lacey Act
Pseudococcus cryptus citriculus mealybug arthropod scale, aphid not present high CDFA (reg. A)
Pseudococcus dendrobiorum Orchid mealybug arthropod scale, aphid not present high CDFA (reg. A)
Pseudococcus elisae banana mealybug arthropod scale, aphid not present low CDFA (reg. A)
Pseudococcus importatus imported mealybug arthropod scale, aphid not present moderate CDFA (reg. A)
Pseudomonas avellanae Bacterial Canker of Hazelnut disease bacterium VALUE REQUIRED VALUE REQUIRED CACASA
Pseudomonas celebensis Blood disease bacterium of banana disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pseudomonas celebensis Freckle disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pseudomonas lignicola Bacterial Stain disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pseudomonas lignicola Potato Leaflet Stunt disease bacterium VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pseudoparlatoria parlatoriodes false paralatoria scale arthropod scale, aphid not present high CDFA (reg. A)
Pseudopezicula tracheiphila Rotbrenner disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Psila rosae carrot rust fly arthropod fly limited n/a (already in CA) CDFA (reg. B)
Psittacula krameri Ring-necked parakeet vertebrate bird VALUE REQUIRED VALUE REQUIRED FL FWCC NNS List
Pterandrus spp. fruit flies arthropod fly limited high USDA Plant/Pest
Pterocles exustus Chestnut-bellied sandgrouse vertebrate bird VALUE REQUIRED VALUE REQUIRED Witmer et al
Pteropus spp. Flying fox vertebrate mammal not present low Cal Code 14:671
Puccinia graminis f. sp. tritici Wheat stem rust (Uganda 99 strain)/Black rust disease fungus not present moderate National IS Info
Puccinia horiana Chrysanthemum White Rust disease fungus limited n/a (already in CA) CACASA
Puccinia mccleanii 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
Pucciniastrum actinidae Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pucciniastrum areolatum Cherry-Spruce Rust disease fungus VALUE REQUIRED VALUE REQUIRED APHIS OPIS
Pueraria montana var. lobata kudzu plant herbaceous not present moderate OR Weed List
Pulvinaria psidii green shield scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Pulvinaria urbicola urban soft scale arthropod scale, aphid limited n/a (already in CA) CDFA (reg. B)
Pycnonotus caferi Red-vented bulbul vertebrate bird VALUE REQUIRED VALUE REQUIRED ISSG 100WorstIAS
Pycnonotus jocosus Red-whiskered bulbul vertebrate bird limited n/a (already in CA) CDFA Vert List
Pyracantha angustifolia 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 crenulata pyracantha plant woody limited n/a (already in CA) Cal-IPC list
Pyricularia grisea Rice Blast disease fungus limited n/a (already in CA) APSNet
Python molurus Burmese python vertebrate reptile not present moderate Cal Code 14:671
Quadraspidiotus ostreaeformis European fruit scale arthropod scale, aphid not present high CDFA (reg. A)
Quadrastichus erythrinae Erythrnia gall wasp arthropod bee, wasp not present high FL Dept. of Ag
Quelea quelea Red-billed quelea vertebrate bird not present low Cal Code 14:671
Quince Sooty Ringspot Agent Quince Sooty Ringspot Agent disease virus VALUE REQUIRED VALUE REQUIRED APHIS OPIS