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Priority Invasives

Not all species pose threats to natural areas, agricultural crops, or the places and pursuits we care about. The FL-PRISM prioritizes which species are of major concern and necessary to map, monitor, and manage based on a variety of factors including capacity, available resources, potential impact, and likelihood of successful elimination. 

The FL-PRISM Priority Invasive Species list are those that are here or are approaching the region that are highly invasive. We are actively looking to prevent the spread and impact and manage infestations, if feasible, or provide guidance to others on management techniques. For a full list of species in the region, click here.

You can help protect our valuable resources: learn how to identify harmful invasive species in your community, spread the word about their negative impacts, and join the regional effort to put a stop to the growing threat invasive species pose to the your region- the beautiful Finger Lakes!.

Remember – Native species may resemble invasive species. Always confirm identification and learn about best management practices and permitting requirements before beginning any control program.

FL-PRISM Priority Invasive Species for Working Groups

Aquatic Working Group (AWG)

Priority invasives of concern:


  • Hydrilla verticillata, Hydrilla (fact sheet)
  • Water chestnut, Trapa natans (fact sheet)
  • Water lettuce, Pistia stratiotes



  • Starry stonewort, Nitellopsis obtuse



  • Bloody red shrimp, Hemimysis


Fish and Fish Diseases

  • Round goby, Neogobius melanostomus
  • Oriental weatherfish, Misgurnus anguillicaudatus(Cantor, 1842)


Connection to Harmful Algal Blooms (HABs)

  • Asian clam, Corbicula fluminea
  • Dreissenids (Zebra and Quagga mussels)


Terrestrial Working Group (TWG)

Priority invasives of concern:


  • Emerald ash borer, Agrilus planipennis
  • Giant hogweed, Heracleum mantegazzianum
  • Hemlock woolly adelgid, Adelges tsugae (fact sheet)
  • Japanese knotweed, Polygonum cuspidatumSiebold & Zucc.
  • Oriental bittersweet, Celastrus orbiculatus
  • Swallow-wort (pale and black), Cynanchum spp. (fact sheet)


High priority early detection invasive species:

  • Japanese stiltgrass, Microstegium vimineum
  • Mile-a-minute vine, Persicaria perfoliata
  • Slender falsebrome, Brachypodium sylvaticum (fact sheet)

Agricultural Working Group (AgWG)

Priority invasives of concern:



  • Autumn and Russian olive
  • Canada thistle
  • Field bindweed
  • Japanese knotweed
  • Johnson grass
  • Ragweed
  • Spotted knapweed
  • Swallow-wort
  • Velvet leaf
  • Wild parsnip



  • Basil downy mildew, Peronospora belbahrii
  • Grape crown gall, Agrobacterium tumefaciens
  • Late blight, Phytophthora infestans
  • Phytophthora blight, Phytophthora capsici
  • Plum pox virus, Potyvirus



  • BMSB (Halyomorpha halys)
  • Garlic bloat nematode (Ditylenchus dipsaci).
  • Golden nematode (Globodera rostochiensis) – not an insect but should be included
  • Spotted wing drosophila (Drosophila suzukii)
  • Swede Midge (Contarinia nasturtii)