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Noxious Weeds Program Risk Assessments

PPQ conducts weed risk assessments (WRA) as part of its process for safeguarding U.S. agriculture and natural resources from weeds and invasive plants. A weed risk assessment is a science-based evaluation of the potential of a plant species to establish, spread, and cause harm in the United States. PPQ may initiate an assessment for any number of reasons, including: evaluation of commodity import requests, detection of a new weed in the United States, and petitions for listing from stakeholders.

Below is a list of all of the available WRAs that PPQ has conducted. They are provided for interested stakeholders and may be useful in setting local policies or informing resource managers. While most of the risk assessments were prepared by PPQ using the current weed risk assessment process [Guidelines Coming Soon], others were prepared using an older process (prior to 2010). We continue to provide these for interested stakeholders. Below, species are listed alphabetically by their scientific name. If a species has a common name, it is provided. New entries to this website are also indicated. Listings may be associated with one or two designations, noted below, that describe their current regulatory status.

  • FNW – The species is currently regulated as a Federal Noxious Weed. For a complete list of all species regulated as Federal Noxious Weeds, see the FNW program home page.
  • NAPPRA – The species is currently Not Authorized (import) Pending Pest Risk Analysis. For a complete list of all pest plant species listed under this category see the NAPPRA web page.


Reference Files

  • APHIS-PPQ Weed Risk Assessment Guidelines: (Check back to this web page for guidelines.)
  • Summary of WRA results (except old formats): (MS Excel - 4.9 MB or PDF - 18 Kb)


Weed Risk Assessments

Scientific Name Common Name PDF (Kb) FNW NAPPRA Date Posted
(YYYY-MM-DD)
Acacia nilotica Thorny acacia 92 FNW 2014-06-06
Acalypha australis Asian copperleaf 279 2014-06-06
Achyranthes japonica Japanese chaff flower 321 2014-06-06
Ageratina riparia Mistflower 62 FNW 2014-06-06
Althaea armeniaca Marshmallow 346 2014-06-06
Anubias barteri (none) 181 2014-06-06
Araujia sericifera Cruel plant 308 2014-06-06
Arctotheca calendula Capeweed 94 FNW 2014-06-06
Ardisia crenata Coralberry ardisia 291 2014-06-06
Arundo donax Giant reed 439 2014-06-06
Austroderia richardii New Zealand pampas 337 2014-06-06
Bacopa australis (none) 204 2014-06-06
Cardiospermum grandiflorum Balloon vine 295 2014-06-06
Carex breviculmis Short-stem sedge 531 2014-06-06
Carex pendula Pendulous sedge 483 2014-06-06
Caulerpa taxifolia Killer algae, Mediterranean strain 726 FNW 2014-06-06
Cestrum laevigatum Inkberry 250 2014-06-06
Chrysanthemoides monilifera Boneseed, Bitou bush 461 2014-06-06
Chrysopogon aciculatus Golden false beardgrass 814 FNW 2014-06-06
Colophospermum mopane Mopane 1,110 2014-06-06
Cordia curassavica Black sage 428 NAPPRA 2014-06-06
Cortaderia jubata Jubata grass 342 2014-06-06
Cortaderia selloana Pampas grass 310 2014-06-06
Crassula helmsii Swamp stonecrop 272 2014-06-06
Delairea odorata Cape ivy 271 2014-06-06
Dittrichia graveolens Stinkwort 309 2014-06-06
Dolichandra unguis-cati Cat's-claw 299 2014-06-06
Echinochloa pyramidalis Antelope grass 303 NAPPRA 2014-06-06
Echinodorus uruguayensis Uruguay sword plant 227 2014-06-06
Euphorbia terracina False caper 62 FNW 2014-06-06
Falcaria vulgaris Sickleweed 403 2014-06-06
Geranium lucidum Shining cranesbill 325 2014-06-06
Gladiolus undulatus Wavy gladiolus 571 2014-06-06
Gymnocoronis spilanthoides Senegal tea plant 250 2014-06-06
Hakea gibbosa Rock hakea 315 2014-06-06
Hakea salicifolia Finger hakea 275 NAPPRA 2014-06-06
Hakea sericea Bushy needlewood 267 NAPPRA 2014-06-06
Homeria spp Cape tulip 36 FNW (only 5 species) 2014-06-06
Hedychium gardnerianum Kahili ginger lily 370 2014-06-06
Heliotropium europaeum European  heliotrope 364   2014-11-17
Impatiens parviflora Smallflower touch-me-not 494 NAPPRA 2014-06-06
Inula britannica British elecampane 180 2014-06-06
Ipomoea aquatica Chinese water-spinach 953 2014-06-06
Iris pseudacorus Yellow flag iris 277 2014-06-06
Leptochilus pteropus Java fern 230 2014-06-06
Ligustrum sinense Chinese privet 299 2014-06-06
Limnobium laevigatum South American spongeplant 681 NAPPRA 2014-06-06
Luziola subintegra Tropical American watergrass 346 2014-06-06
Lygodium flexuosum Maidenhair-creeper 669 FNW 2014-06-06
Lygodium japonicum Japanese climbing fern 669 2014-06-06
Lygodium microphyllum Old world climbing fern 669 2014-06-06
Mikania micrantha Mile-a-minute 297 FNW 2014-06-06
Mimosa pudica Sensitive plant 463 2014-11-17
Nassella neesiana Chilean needlegrass 425 2014-06-06
Neptunia oleracea Water mimosa 255 2014-06-06
Nymphoides cristata Crested floating heart 306 NAPPRA 2014-06-06
Nymphoides indica Water snowflake 213 2014-06-06
Nymphoides peltata Yellow floating heart 225 2014-06-06
Onopordum acaulon Stemless thistle 53 FNW 2014-06-06
Onopordum illyricum Illyrian thistle 57 FNW 2014-06-06
Oplismenus hirtellus subsp. undulatifolius Wavyleaf basketgrass 380 2014-06-06
Persicaria chinensis Chinese knotweed 444 2014-06-06
Phyllanthus maderaspatensis Canoe weed 490 NAPPRA 2014-06-06
Phyllostachys aurea Golden bamboo 495 2014-06-06
Phyllostachys aureosulcata Yellow groove bamboo 342 2014-06-06
Pilea hyalina (none) 247 2014-06-06
Pistacia chinensis Chinese pistache 532 2014-06-06
Praxelis clematidea Praxelis 293   2014-11-17
Rottboellia cochinchinensis Itch grass 86 FNW 2014-06-06
Rumex sagittatus Climbing dock 305 NAPPRA 2014-06-06
Sagittaria sagittifolia Arrowhead 189 FNW 2014-06-06
Senecio angulatus Cape ivy 287 NAPPRA 2014-06-06
Senecio inaequidens South African ragwort 278 FNW 2014-06-06
Senecio madagascariensis Madagascar ragwort 278 FNW 2014-06-06
Sideritis montana Mountain ironwort 455 2014-06-06
Solanum sisymbriifolium Sticky nightshade 345 2014-06-06
Solanum viarum Tropical soda apple 528 FNW 2014-06-06
Thymelaea passerina Spurge flax 966 2014-06-06
Toona sinensis Chinese toon 426 2014-06-06
Tridax procumbens Coat buttons 264 2014-06-06
Triplaris melaenodendron Long John 245 2014-06-06
Vitex rotundifolia Beach vitex 1,131 2014-06-06
Wikstroemia indica Tiebush 259 NAPPRA 2014-06-06
Xanthoceras sorbifolium Yellowhorn 213 2014-06-06

 

For information on weed risk assessments contact:
Anthony L. Koop, Ph.D.
Weed Risk Assessment Lead / Botanist, Ecologist
Telephone: (919) 855-7429
Email: Anthony.L.Koop@aphis.usda.gov

- Or -

Barney P. Caton, Ph.D.
Assistant Lab Director / Ecologist
Telephone: (919) 855-7504
Email: Barney.P.Caton@aphis.usda.gov

For information on FNW policies contact:
Jonathan Jones
National Policy Manager / Botanist
Telephone: (301) 851-2128
E-mail: Jonathan.M.Jones@aphis.usda.gov

For information on plants for planting listed under NAPPRA contact:
Al Tasker, Ph.D.
Regulatory Specialist / Weed Scientist
Telephone: (301) 851-2224
E-mail: Alan.V.Tasker@aphis.usda.gov



Additional Information