Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide


Pueraria montana var. lobata



Pueraria montana var. lobata (kudzu)


  • Last modified
  • 19 November 2018
  • Datasheet Type(s)
  • Invasive Species
  • Pest
  • Host Plant
  • Preferred Scientific Name
  • Pueraria montana var. lobata
  • Preferred Common Name
  • kudzu
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Plantae
  •     Phylum: Spermatophyta
  •       Subphylum: Angiospermae
  •         Class: Dicotyledonae
  • Summary of Invasiveness
  • P. montana, formerly known as P. lobata, is widely known in the USA as ‘kudzu’ is native to East Asia. However, it does not appear to be a significant problem anywhere except in south-eastern USA where...

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Kudzu covering trees and roadside. Near Horn Lake, Mississippi, USA.
TitleRoadside infestation
CaptionKudzu covering trees and roadside. Near Horn Lake, Mississippi, USA.
CopyrightNathan Schiff/U.S.D.A Forest Service
Kudzu covering trees and roadside. Near Horn Lake, Mississippi, USA.
Roadside infestationKudzu covering trees and roadside. Near Horn Lake, Mississippi, USA.Nathan Schiff/U.S.D.A Forest Service
Kudzu in flower. Wenfu Town, China.
TitleFlowering plant
CaptionKudzu in flower. Wenfu Town, China.
CopyrightNathan Schiff/U.S.D.A Forest Service
Kudzu in flower. Wenfu Town, China.
Flowering plantKudzu in flower. Wenfu Town, China.Nathan Schiff/U.S.D.A Forest Service
Mature kudzu flowers with developing seed pods.
TitleMature flowers
CaptionMature kudzu flowers with developing seed pods.
CopyrightNathan Schiff/U.S.D.A Forest Service
Mature kudzu flowers with developing seed pods.
Mature flowers Mature kudzu flowers with developing seed pods. Nathan Schiff/U.S.D.A Forest Service
Young kudzu tuber. Anhui Province, China.
TitleYoung tuber
CaptionYoung kudzu tuber. Anhui Province, China.
CopyrightNathan Schiff/U.S.D.A Forest Service
Young kudzu tuber. Anhui Province, China.
Young tuberYoung kudzu tuber. Anhui Province, China.Nathan Schiff/U.S.D.A Forest Service
Bee, Megachile sculpturalis, pollinating kudzu. Bai Shaling, China.
CaptionBee, Megachile sculpturalis, pollinating kudzu. Bai Shaling, China.
CopyrightNathan Schiff/U.S.D.A Forest Service
Bee, Megachile sculpturalis, pollinating kudzu. Bai Shaling, China.
PollinatorBee, Megachile sculpturalis, pollinating kudzu. Bai Shaling, China.Nathan Schiff/U.S.D.A Forest Service
Gregarious sawfly larvae on the underside of a kudzu leaf. Jiuhua Mountains, China.
TitleNatural enemy
CaptionGregarious sawfly larvae on the underside of a kudzu leaf. Jiuhua Mountains, China.
CopyrightNathan Schiff/U.S.D.A Forest Service
Gregarious sawfly larvae on the underside of a kudzu leaf. Jiuhua Mountains, China.
Natural enemyGregarious sawfly larvae on the underside of a kudzu leaf. Jiuhua Mountains, China.Nathan Schiff/U.S.D.A Forest Service


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Preferred Scientific Name

  • Pueraria montana var. lobata (Willd.) Maesen & Almeida S.M. Almeida ex Sanjappa & Predeep

Preferred Common Name

  • kudzu

Other Scientific Names

  • Dioclea odorata Montrouzier 1860
  • Dolichos hirsutus Thunb. 1794
  • Dolichos japonica hort. nom. nud., Bailey 1924
  • Dolichos lobatus Willd. 1802
  • Dolichos trilobus Houtt 1779
  • Neustanthus chinensis Benth. 1861
  • Pachyrhizus thunbergianus Siebold & Zuccarini 1846
  • Phaseolus trilobus (L.) 1789
  • Pueraria argyi Lévl and Vaniot 1908
  • Pueraria bodinieri Lévl and Vaniot 1908
  • Pueraria caerulea Lévl and Vaniot 1908
  • Pueraria harmsi Rech. 1910
  • Pueraria hirsuta (Thunb.) Matsumura non Kurz 1902
  • Pueraria koten Lévl and Vaniot 1908
  • Pueraria lobata (Willd.) Ohwi 1965
  • Pueraria lobata var. lobata Ohwi
  • Pueraria neo-caledonica Harms 1906
  • Pueraria novo-guineensis Warburg 1891
  • Pueraria pseudo-hirsuta Tang & Wang nom. nud., Hu & Hsun 1955
  • Pueraria thunbergiana (Sieb. & Zucc.) Benth. 1867
  • Pueraria triloba (Houtt.) Makino in Iinuma 1912
  • Pueraria triloba (Lour.) Backer in Heyne 1927
  • Pueraria triloba Makino ex Backer 1963
  • Pueraria volkensii Hosokawa 1938

International Common Names

  • Spanish: kudzo ordinario; kudzu; kudzu comun
  • French: koudsou; koudzou; kudzu; kudzu du Japon; vigne japonaise

Local Common Names

  • China: fen ge teng; gue; ko; ko t'eng; koten
  • Fiji: aka; wa-yake; yaka
  • Germany: Kopoubohne
  • Indonesia: bitok; ngu lok; tebi; tobi
  • Italy: pueraria
  • Japan: daisumame; fusi maki kadsura; in ken maki; katsi maki; kudzu; kuzu; saitzu mame
  • Korea, DPR: cheulk; chik; chuk
  • New Caledonia: magnana rkerku; quechoc
  • Papua New Guinea: goruma; gosima; hgedafo; kagomba; kenangia; kohena; ko'pitu; korono; mapumb; mudja; muntamagana; nggaoka; nggondumu; ngko'ahi; ngko-ko; oka mapumb; oka moi; op; owitu; sifu; so'onea; wowitu
  • Philippines: baai; tahaunon
  • Solomon Islands: lebu
  • Thailand: tum yaa krua
  • Tonga: aka; fue alpuaka; fue'ae puaka
  • USA: Japanese arrowroot; ko-hemp; kudzu bean; kudzu vine; Mason-Dixon vine; Thunberg kudzu vine
  • Vietnam: cu nang; cu san day

EPPO code

  • DOLTR (Dolichos trilobus)
  • PUELO (Pueraria lobata)

Summary of Invasiveness

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P. montana, formerly known as P. lobata, is widely known in the USA as ‘kudzu’ is native to East Asia. However, it does not appear to be a significant problem anywhere except in south-eastern USA where it was extensively planted in the 1930s and 1940s for erosion control. Seed dispersal appears to be minor but vegetative growth in subtropical areas can be substantial, up to 18 m per growing season. It is a climbing vine and kills vegetation by completely smothering it, and it will also entirely cover telegraph poles and buildings if left to itself. Once introduced it is difficult to control, especially in forest and marginal habitats. There are three varieties, although only var. lobata is so far known to be invasive, in the USA.

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Plantae
  •         Phylum: Spermatophyta
  •             Subphylum: Angiospermae
  •                 Class: Dicotyledonae
  •                     Order: Fabales
  •                         Family: Fabaceae
  •                             Subfamily: Faboideae
  •                                 Genus: Pueraria
  •                                     Species: Pueraria montana var. lobata

Notes on Taxonomy and Nomenclature

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The genus Pueraria has been revised twice, first with nine species by Bentham (1867) and later with 17 species by van der Maesen (1985). The widely dispersed species commonly known as ‘kudzu’ corresponds to van der Maesen's Puerarialobata. It is a very variable species that has been described many times resulting in extensive synonymy and many common names. Van der Maesen found it convenient to separate three varieties largely on the basis of size; P.lobata (Willd.) Ohwi var. lobata Ohwi, P.lobata (Willd.) Ohwi var. montana (Lour.) Maesen, and P.lobata var. thomsonii (Benth.) Maesen later revised to P.lobata var. chinensis (Ohwi) Maesen & Almeida. All three varieties are quite widespread in their native South-East Asia but van der Maesen (1985) suggests that var. lobata was the only variety to be widely exported outside its natural range. Although Puerarialobata (Willd.) Ohwi has been the commonly used Latin name for several decades, in the early 1990s the name Puerariamontana (Lour.) Merr. started to appear occasionally. There was some confusion until Ward (1998) wrote a clarifying note in which he explained that van der Maesen inexplicably chose the epithet lobata (1802) for kudzu even though montana (1790) had priority. Thus the correct scientific name for kudzu is Puerariamontana (Lour.) Merr. var. lobata (Willd.) Maesen & Almeida (1988). Many vernacular names are also given by van der Maesen (1985). This datasheet thus covers the entire species, but much of the information on it as an invasive in USA deal in large part only with the variety lobata.


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Kudzu is a perennial climbing vine that produces very large tubers up to 2 m long and 18-45 cm wide that can weigh as much as 180 kg on old plants. Stems or branches are strong, approximately 0.6-2.5 cm in diameter and up to 30 m in length. They can grow up to 25 cm per day or 18 m per growing season, and produce root crowns where nodes contact soil. Leaves are pinnately trifoliate, 8-20 cm long and 5-19 cm wide with leaflets ovate to orbicular and unlobed to trilobed. Leaves are pale green above and light to greyish green below. Purple to blue flowers, that smell of grapes, are borne on a mostly unbranched inflorescence 10-25 cm long. Seeds are borne in golden-haired, brown, flattened, oblong pods, 4-13 cm long and 0.6-1.3 cm wide. The seeds, visible through the pod, are flattened, ovoid and reddish brown with a black mosaic pattern. They are approximately 4-5 mm long by 4 mm wide and 2 mm thick (van der Maesen, 1985). For a more detailed description and a key to the three varieties, see van der Maesen (1985).

Plant Type

Top of page Broadleaved
Seed propagated
Vegetatively propagated
Vine / climber


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There appears to be some confusing surround the exact limits of the native range. The three varieties of Puerariamontana have overlapping but not identical distributions. Var. lobata is the most widespread, presumed to be native to China, Japan and other parts of South-East Asia, it has spread or been introduced to many tropical regions including Oceania, Central Europe, Central and South America and the continental USA where it is an aggressive and noxious weed. Var. montana and var. thomsonii have more limited ranges in China, Myanmar, Laos, Philippines, Taiwan, Thailand and Vietnam; with var. montana also in Japan (the Ryukyu Archipelago) and var. thomsonii in India, Bhutan and Hawaii (introduced). Kudzu is probably much more widespread in South and Central America but, as it is not considered a pest there, records are not widely reported. The distribution list refers to records of all the varieties and accepts a wider native range than noted by any single source, for example, accepting ILDIS (2007) noting a native range as far south as Queensland, Australia and as far west as Tonga and the Solomon Islands, apparently based on van der Maesen (1985).

Distribution Table

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The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

Continent/Country/RegionDistributionLast ReportedOriginFirst ReportedInvasiveReferenceNotes


BhutanPresentNativeILDIS, 2007
ChinaPresentEPPO, 2014
-AnhuiPresentNative Not invasive van der Maesen, 1985
-FujianPresentNative Not invasive van der Maesen, 1985; EPPO, 2014
-GuangdongPresentNative Not invasive van der Maesen, 1985
-GuangxiPresentNative Not invasive van der Maesen, 1985
-GuizhouPresentNative Not invasive van der Maesen, 1985
-HainanPresentNative Not invasive van der Maesen, 1985
-HebeiPresentNative Not invasive van der Maesen, 1985
-HeilongjiangPresentNative Not invasive van der Maesen, 1985
-HenanPresentNative Not invasive van der Maesen, 1985
-Hong KongPresentNative Not invasive van der Maesen, 1985; ILDIS, 2007
-HubeiPresentNative Not invasive van der Maesen, 1985
-HunanPresentNative Not invasive van der Maesen, 1985
-JiangsuPresentNative Not invasive van der Maesen, 1985
-JilinPresentNative Not invasive van der Maesen, 1985
-LiaoningPresentNative Not invasive van der Maesen, 1985
-ShandongPresentNative Not invasive van der Maesen, 1985
-ShanxiPresentNative Not invasive van der Maesen, 1985
-SichuanPresentNative Not invasive van der Maesen, 1985
-YunnanPresentNative Not invasive van der Maesen, 1985
-ZhejiangPresentNative Not invasive van der Maesen, 1985
IndiaPresentIntroducedILDIS, 2007
-Arunachal PradeshPresentIntroducedILDIS, 2007
-DelhiPresentIntroducedILDIS, 2007
-GujaratPresentIntroducedILDIS, 2007
-KarnatakaPresentIntroducedILDIS, 2007
-MaharashtraPresentIntroducedILDIS, 2007
-ManipurPresentIntroducedILDIS, 2007
-MeghalayaPresentIntroducedILDIS, 2007
-NagalandPresentIntroducedILDIS, 2007
-SikkimPresentIntroducedILDIS, 2007
-West BengalPresentIntroducedILDIS, 2007
IndonesiaPresentILDIS, 2007; EPPO, 2014
-Irian JayaPresent Not invasive Verdcourt, 1979
-JavaPresent Not invasive van der Maesen, 1985; ILDIS, 2007
JapanPresentEPPO, 2014
-HokkaidoPresentNative Not invasive van der Maesen, 1985
-HonshuPresentNative Not invasive van der Maesen, 1985
-KyushuPresentNative Not invasive van der Maesen, 1985
-Ryukyu ArchipelagoPresentNative Not invasive van der Maesen, 1985; ILDIS, 2007
Korea, DPRPresentNative Not invasive van der Maesen, 1985; EPPO, 2014
Korea, Republic ofPresentNative Not invasive van der Maesen, 1985; EPPO, 2014
LaosPresentNativeILDIS, 2007
MalaysiaPresentEPPO, 2014
-Peninsular MalaysiaPresentNative Not invasive van der Maesen, 1985; ILDIS, 2007
-SarawakPresentNative Not invasive van der Maesen, 1985
PakistanPresentNative Not invasive Ali, 1977; ILDIS, 2007; EPPO, 2014
PhilippinesPresentNative Not invasive van der Maesen, 1985; ILDIS, 2007; EPPO, 2014
TaiwanPresentNative Not invasive van der Maesen, 1985; ILDIS, 2007
ThailandPresentNative Not invasive van der Maesen, 1985; ILDIS, 2007; EPPO, 2014
VietnamPresentNative Not invasive van der Maesen, 1985; ILDIS, 2007; EPPO, 2014


Sierra LeonePresentIntroduced Not invasive Hepper, 1958; ILDIS, 2007; EPPO, 2014

North America

BermudaPresentIntroducedSchotman, 1989; EPPO, 2007; EPPO, 2014
MexicoPresentIntroduced Invasive PIER, 2007
USARestricted distributionEPPO, 2014
-AlabamaWidespreadIntroduced Invasive van der Maesen, 1985; EPPO, 2014
-ArkansasWidespreadIntroduced Invasive USDA-NRCS, 2002; USDA-NRCS, 2007
-ConnecticutPresentIntroduced Not invasive USDA-NRCS, 2002
-DelawarePresentIntroduced Not invasive USDA-NRCS, 2002; USDA-NRCS, 2007
-District of ColumbiaPresentIntroducedUSDA-NRCS, 2012
-FloridaWidespreadIntroduced Invasive van der Maesen, 1985
-GeorgiaWidespreadIntroduced Invasive van der Maesen, 1985; EPPO, 2014
-HawaiiPresentIntroducedUSDA-NRCS, 2012
-IllinoisPresentIntroduced Invasive van der Maesen, 1985
-IndianaPresentIntroducedUSDA-NRCS, 2007; USDA-NRCS, 2012
-KansasPresentIntroduced Invasive USDA-NRCS, 2002; USDA-NRCS, 2007
-KentuckyPresentIntroduced Invasive USDA-NRCS, 2012
-LouisianaWidespreadIntroduced Invasive USDA-NRCS, 2002; USDA-NRCS, 2007
-MarylandPresentIntroduced Not invasive USDA-NRCS, 2002; USDA-NRCS, 2007
-MassachusettsPresentIntroduced Not invasive Sorrie and Perkins, 1988
-MississippiWidespreadIntroduced Invasive van der Maesen, 1985; EPPO, 2014
-MissouriPresentIntroduced Invasive van der Maesen, 1985
-NebraskaAbsent, formerly presentIntroduced Not invasive McKee and Stephens, 1943
-New JerseyPresentIntroduced Not invasive Snyder, 1987
-New YorkPresentIntroduced Not invasive Frankel, 1989
-North CarolinaPresentIntroduced Invasive van der Maesen, 1985
-OhioPresentIntroduced Invasive USDA-NRCS, 2002; USDA-ARS, 2007
-OklahomaPresentIntroduced Invasive van der Maesen, 1985
-OregonPresentIntroduced Not invasive Colquhoun, 2000
-PennsylvaniaPresentIntroduced Not invasive van der Maesen, 1985
-South CarolinaPresentIntroduced Invasive van der Maesen, 1985
-TennesseeWidespreadIntroduced Invasive van der Maesen, 1985
-TexasWidespreadIntroduced Invasive van der Maesen, 1985
-VirginiaWidespreadIntroduced Invasive van der Maesen, 1985
-WashingtonPresentIntroduced Invasive USDA-NRCS, 2012
-West VirginiaPresentIntroduced Invasive USDA-NRCS, 2002; USDA-NRCS, 2007

Central America and Caribbean

Dominican RepublicPresentIntroduced Not invasive Liogier, 1985; ILDIS, 2007; EPPO, 2014
JamaicaPresentIntroduced Not invasive Howard and Proctor, 1957; EPPO, 2014
PanamaPresentIntroduced Not invasive D'Arcy, 1987; ILDIS, 2007; EPPO, 2014

South America

BrazilPresentIntroduced Not invasive Morel, 2003; EPPO, 2014
ParaguayPresentIntroduced Not invasive Morel, 2003; EPPO, 2014


ItalyPresent, few occurrencesEPPO, 2007; EPPO, 2014
Russian FederationPresentPresent based on regional distribution.
-Russian Far EastPresentNativeUSDA-ARS, 2007
SwitzerlandPresent, few occurrencesIntroduced Not invasive Swiss Commission for Wild Plant Conservation, 2003; EPPO, 2007; EPPO, 2014


American SamoaPresentEPPO, 2014
AustraliaPresentILDIS, 2007; EPPO, 2014
-Australian Northern TerritoryPresentIntroducedRoyal Botanic Gardens Sydney, 2007
-New South WalesPresentIntroduced Not invasive Hnatiuk, 1990
-QueenslandPresentIntroduced Not invasive van der Maesen, 1985; ILDIS, 2007
-VictoriaPresentRoyal Botanic Gardens Sydney, 2007
FijiPresentIntroduced Not invasive van der Maesen, 1985; ILDIS, 2007; EPPO, 2014
French PolynesiaPresentIntroduced Invasive PIER, 2007
Micronesia, Federated states ofPresentIntroduced Not invasive van der Maesen, 1985; PIER, 2007; EPPO, 2014
New CaledoniaPresentIntroduced Not invasive van der Maesen, 1985; ILDIS, 2007; EPPO, 2014
New ZealandPresentEPPO, 2007; EPPO, 2014
NiuePresentIntroduced Not invasive Sykes, 1970; ILDIS, 2007; EPPO, 2014
Norfolk IslandPresentIntroduced Invasive PIER, 2007
PalauPresentNativePIER, 2007
Papua New GuineaPresentIntroduced Not invasive van der Maesen, 1985; ILDIS, 2007; EPPO, 2014
SamoaPresentIntroduced Not invasive van der Maesen, 1985; PIER, 2007
Solomon IslandsPresentIntroduced Not invasive van der Maesen, 1985; EPPO, 2014
TongaPresentIntroduced Not invasive van der Maesen, 1985; ILDIS, 2007; EPPO, 2014
VanuatuPresentIntroducedvan der Maesen, 1985; ILDIS, 2007; EPPO, 2014
Wallis and Futuna IslandsPIER, 2007

History of Introduction and Spread

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Van der Maesen (1985) suggests that kudzu was introduced to Papua New Guinea, New Caledonia and surrounding areas from the Orient in ancient times and that it was an important food source before yams, taro and sweet potatoes became dominant. However, in the distribution list, a broader native range of P. montana, based on ILDIS (2007), is accepted in this datasheet. Introduction of kudzu to the USA is much more recent, and can be traced to the Japanese Pavilion of the Philadelphia Centennial Exposition of 1876 where it was distributed as an ornamental vine, and then again at the New Orleans Exposition in 1883 (Shurtleff and Aoyagi, 1977). In the early 1900s, kudzu began to be used as a fodder crop. It was promoted and distributed by Mr CE Pleas, a Florida farmer, who noticed that it was both easy to grow and that many farm animals would eat it (Shurtleff and Aoyagi, 1977). Due to its incredible growth rate (up to 18 m per growing season) and the ability to produce new roots where nodes come into contact with the ground, it was selected for erosion control in the 1930s and 1940s. It was actively promoted and planted throughout south-eastern USA by the Agricultural Stabilization and Conservation Service in conjunction with the Soil Conservation Service and the Civilian Conservation Corps (Tabor and Susott, 1941; Stevens, 1976). During this period the Soil Erosion Service paid farmers up to US $8 per acre ($20 per hectare) to plant more than 1.2 million acres (3 million hectares) of kudzu to stabilize southern soils (Miller and Edwards, 1983; Britton et al., 2002). Unchecked by natural enemies, it was developing into a weedy pest by the 1950s. Unsuccessful attempts to eliminate it from land to be used for grazing prompted its removal in 1953 from the list of permissible cover plants under the Agricultural Conservation Program (Miller and Edwards, 1983). Eventually, the US Congress listed it as a Federal Noxious Weed in 1998 (Britton et al., 2002).

Currently, kudzu is a serious pest in south-eastern USA, extending as far north as New York, New Jersey, New England, Massachusetts, Pennsylvania and Illinois, and as far west as Texas, Oklahoma and Nebraska (McKee and Stephens, 1943; Shurtleff and Aoyagi, 1977; Snyder, 1987; Sorrie and Perkins, 1988; Frankel, 1989; Mitich, 2000). In Florida it has begun to invade the everglades (Virginia Native Plant Society, 1999) and small outbreaks have been reported in Oregon (Colquhoun, 2000).

Risk of Introduction

Top of page Kudzu is widely established in eastern USA. It could be dispersed as seeds in soil or as an ornamental plant through mail order. A few small infestations have been eradicated in Oregon (Colquhoun, 2000) and kudzu is a quarantine-restricted plant for that state (USDA-NRCS, 2002).


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Kudzu is an opportunistic climbing vine that grows in numerous habitats including woods, plantation forests, along rivers and roads, on the borders of fields, in abandoned fields, on embankments and along fencerows. It is often seen draped over trees that it has killed, on telephone poles and wires, and on abandoned vehicles and buildings (USDA, 1976). Although kudzu grows well on many soil types including nutrient-poor, sandy and high clay soils, it is most suited to well-drained loamy soils. It does not favour very wet soils, perhaps explaining its absence from the Mississippi Delta, USA, nor soils with high pH (Mitich, 2000). In the USA, kudzu has a wide geographic and climatic range but grows best in areas with at least 1000 mm annual rainfall, mild winters (5-15°C) and hot summers (above 25°C). In China, kudzu is found on road embankments and in mountainous regions where cultivation of crops was not possible.

Habitat List

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Terrestrial – ManagedCultivated / agricultural land Present, no further details Harmful (pest or invasive)
Managed forests, plantations and orchards Present, no further details Harmful (pest or invasive)
Managed grasslands (grazing systems) Present, no further details Harmful (pest or invasive)
Disturbed areas Present, no further details Harmful (pest or invasive)
Disturbed areas Present, no further details Natural
Rail / roadsides Present, no further details Harmful (pest or invasive)
Urban / peri-urban areas Present, no further details Harmful (pest or invasive)
Buildings Present, no further details Harmful (pest or invasive)
Terrestrial ‑ Natural / Semi-naturalNatural forests Present, no further details Harmful (pest or invasive)
Natural forests Present, no further details Natural
Natural grasslands Present, no further details Harmful (pest or invasive)
Riverbanks Present, no further details Harmful (pest or invasive)
Riverbanks Present, no further details Natural

Hosts/Species Affected

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Kudzu kills plants by smothering, growing over them and blocking out all available light thus preventing photosynthesis. Kudzu kills all plants that it overgrows and is a significant pest in southern USA pine plantations.

Host Plants and Other Plants Affected

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Plant nameFamilyContext
Pinus sp. (pine)PinaceaeMain

Biology and Ecology

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Heider et al. (2007) found a high level of genetic variation between provenances of P. montana var. lobata in molecular RAPDs studies. An alloenzyme-based population genetics study of US populations showed unexpectedly high heterozygosity. This suggests that populations are the result of multiple introductions and that sexual reproduction probably occurs within populations (Pappert et al., 2000). Some populations with relatively few genotypes displayed an excess of heterozygotes suggesting selection for heterozygosity. A subsequent study showed that highly heterozygous individuals accumulated more biomass and leaf area than less heterozygous individuals (Pappert, 1998).

Physiology and Phenology

The dominant feature of kudzu is its ability to climb over other vegetation including trees. This allows it to maximize light capture for itself while shading its competitors. Kudzu's phenomenal growth is achieved by allocating more biomass to photosynthetic rather than structural tissues (Wechsler, 1974), and using diurnal leaf movements to modulate leaf temperatures, optimizing photosynthesis and reducing water loss (Forseth and Teramura, 1986; 1987). Although kudzu can be found underneath the canopy, it prefers open areas or edges where its photosynthetic rate is highest. Kudzu's climbing mechanism, twining, is adaptive for high light saturation conditions (Carter and Teramura, 1988a,b). When grown under increasing levels of carbon dioxide, kudzu produces more leaf biomass, has longer stems, more branches and the leaves expand sooner, suggesting that it will become even more dominant with increased atmospheric carbon dioxide (Sasek and Strain, 1988,1989).

Reproductive Biology

Most of the spread of kudzu in the USA is due to vegetative growth because seed production is poor. In fact, when kudzu was being planted for erosion control in 1935 it was necessary to import seed (160 kg) from Japan to satisfy the demand for seedlings (Tabor and Susott, 1941). Seed production is poor because flowers are limited to the vertically growing kudzu stems. When pods are formed, the seeds are often killed by native Hemiptera and, less commonly, by a naturalized Asian bruchid seed weevil, Borowiecius ademptus (Thornton, 2001).

In the USA, pollination appears to be adequate by native and naturalized Hymenoptera (Thornton, 2001). In Japan and China, a megachilid bee (Megachile sculpturalis) has been observed pollinating kudzu (Batra, 1998), which is now naturalized in the USA (Mangum and Brooks, 1997). In the 1930s, when seedlings were unavailable, farmers sold seed crowns, that formed wherever kudzu stem nodes contacted the soil, for US $5-7 per thousand (approximately $220 per hectare) (Tabor and Susott, 1941). Takahashi and Kikuchi (1986) noticed that kudzu was one of several species that repopulated Nanakita Hill (Honshu, Japan) after a forest fire. They showed that kudzu seeds germinated at a significantly higher rate than controls if they were soaked in hot water (90°C or 70°C) for 30 seconds.


Like many legumes, kudzu has a symbiotic relationship with nitrogen fixing bacteria. Erdman (1967) estimated that kudzu fixed 88 kg of nitrogen per hectare, a little less than half that fixed by lucerne (186 kg) and about twice the amount fixed by soyabeans (51 kg), groundnuts (42 kg) or Phaseolus vulgaris beans (40 kg). Nitrogen-fixing bacteria are functionally divided into seven groups. Kudzu is in the cowpea group with groundnuts, velvetbeans (Mucuna pruriens), lima beans (Phaseolus lunatus) and others (Erdman, 1967). Isolates from kudzu root nodules grown on YMA (Yeast Mannitol Agar), do not absorb Congo red and are Gram negative, all attributes consistent with Rhizobium spp. (AD Searle, Wake Forest University, North Carolina, USA, personal communication, 2002).



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C - Temperate/Mesothermal climate Preferred Average temp. of coldest month > 0°C and < 18°C, mean warmest month > 10°C
Cf - Warm temperate climate, wet all year Preferred Warm average temp. > 10°C, Cold average temp. > 0°C, wet all year
Cs - Warm temperate climate with dry summer Preferred Warm average temp. > 10°C, Cold average temp. > 0°C, dry summers
Cw - Warm temperate climate with dry winter Preferred Warm temperate climate with dry winter (Warm average temp. > 10°C, Cold average temp. > 0°C, dry winters)


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ParameterLower limitUpper limitDescription
Mean annual rainfall00mm; lower/upper limits

Soil Tolerances

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Soil drainage

  • free

Soil reaction

  • acid
  • neutral

Soil texture

  • heavy
  • light
  • medium

Natural enemies

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Natural enemyTypeLife stagesSpecificityReferencesBiological control inBiological control on
Myrothecium verrucaria Pathogen USA (Louisiana)
Pseudomonas savastanoi pv. phaseolicola Pathogen Alabama

Notes on Natural Enemies

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Approximately 25 species of insect have been observed feeding on kudzu (Pemberton, 1988; Britton et al., 2002; and unpublished data from J DeLoach, ARS Grassland, Soil and Water Laboratory, Temple, Texas, USA; G Markin, USDA Forest Service, Bozeman Forestry Sciences, Montana, USA; NM Schiff, USDA Forest Service, Center for Bottomland Hardwoods Research, Stoneville, Mississippi, USA). Of these, seven species are not specific to kudzu (Deporaus sp., Alcidodes trifidus, Sagra femorata, Aristobia hispida, Paraleprodera diopthalma, Anomala corpulenta andEpicauta chinensis); the others are still under investigation and include sawflies, leaf beetles, weevils, longhorned beetles (Cerambycidae), scarab beetles (Scarabeidae) and flat headed borers (Buprestidae) (Britton et al., 2002). There are several reports of arthropods that can live on kudzu but are not considered potential control agents, including the soyabean looper Pseudoplusia includens [Chrysodeixis includens] (Kidd and Orr, 2001), the silver-spotted skipper Epargyreus clarus in the USA (Lind et al., 2001) and the velvetbean caterpillar Anticarsia gemmatalis (Fescemyer and Erlandson, 2003). In Japan, at least three Hemiptera, a parasitoid wasp and two mites develop on or are associated with kudzu (Takasu and Hirose, 1986;Tayutivutikul and Yano, 1989,1990; Shimoda et al., 1997).

In the USA, seeds are eaten by native Hemiptera and a naturalized Asian bruchid seed weevil, Borowiecius ademptus (Thornton, 2001).

Six fungal pathogens have been isolated from kudzu in Anhui Province, China, and may have potential for use as biological control agents for kudzu in the USA (Jiang et al., 2000). A common disease called 'imitation rust' is caused by the fungus Synchytrium puerariae. This pathogen can infect all plant tissues including leaves, stems, flowers and seedpods. Other pathogens included Pseudocercospora puerariicola, the cause of angular leafspot, Cercospora puerario-thomsona, the cause of brown spot, and Phomopsis sp., Colletotrichum lindemuthianum and Colletotrichum sp., causal agents of anthracnose. Virus disease such as leaf mottling and mosaic disease were also found in some parts of China (Jiang et al., 2000).

Soyabean rust (Phakopsora pachyrhizi) is common on kudzu in areas close to soyabean fields in Brazil and Paraguay (Poolpol and Pupipat, 1985; Morel, 2003). A Phytophthora species was isolated from infected root and foliar parts of kudzu in the Korea Republic (YW Lee, Department of Agricultural Biology and Research Center for New Biomaterials in Agriculture, College of Agriculture and Life Sciences, Seoul National University, Suwon, Korea Republic, personal communication, 2003).


Means of Movement and Dispersal

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Dispersal of kudzu is primarily by man. Kudzu was introduced to the USA as an ornamental, then encouraged for livestock fodder, and finally actively planted for erosion control throughout the south-east. It is possible that it can be dispersed as seeds either via animals or by moving contaminated soil but these effects would be swamped by the earlier human aided dispersal. Kudzu has also been introduced to Central and South America but it was not as widely planted as in the USA and has not attained pest status.

Pathway Vectors

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VectorNotesLong DistanceLocalReferences
Mail Yes
Soil, sand and gravel Yes

Plant Trade

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Plant parts liable to carry the pest in trade/transportPest stagesBorne internallyBorne externallyVisibility of pest or symptoms

Impact Summary

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Crop production Negative
Cultural/amenity Negative
Economic/livelihood Negative
Environment (generally) Positive and negative
Forestry production Negative
Livestock production Positive
Native flora Negative

Economic Impact

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It is difficult to measure the economic impact of kudzu because of its non-direct effect of taking land out of production. Recent estimates of the kudzu infestation in south-eastern USA range from 809,000 to 3.2 million hectares (Everest et al., 1991; Corley et al., 1997). At 2002 prices a 25-year-old pine plantation in the southern USA is worth approximately US $1430 per hectare, and whereas costs of eliminating kudzu vary, they are not cost effective in forestry plantations (Britton et al., 2002).

Environmental Impact

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Kudzu is typically a pest of disturbed habitats but when it does encroach on natural areas it kills trees and plants by growing over them. Kudzu is associated with nitrogen-fixing bacteria (Erdman, 1967) and improves the soil (Robertson, 1997) but once land is infested with kudzu nothing else can grow there without costly kudzu removal (Britton et al., 2002). Sharkey and Loreto (1993) studied isoprene emission in kudzu because the large acreage made it a source comparable to tree species. Isoprene contributes to the blue haze over some forests (Went, 1960) and its breakdown in the presence of nitrous oxide leads to ozone formation (Trainer et al., 1987). Sharkey and Loreto (1993) found that kudzu isoprene emission was more variable than that of oak or aspen and suggested it might complicate construction of isoprene emission inventories. They speculated that isoprene emission was adaptive for kudzu, even though it led to ozone formation, because it might help plants cope with stressful conditions.

Impact: Biodiversity

Top of page There is very little information on specific impacts of kudzu on biodiversity. There is obvious potential for damage because few plants can survive once smothered by kudzu and small ecosystems could be radically altered, however, most kudzu was planted in habitats that were already disturbed or eroded. Kudzu does invade National Parks but a feasibility study for its eradication and restoration of the habitat with native tree species for two parks in Tennessee, USA, did not mention impacts on biodiversity (Rosen, 1982).

Threatened Species

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Threatened SpeciesConservation StatusWhere ThreatenedMechanismReferencesNotes
Platanthera integrilabia (white fringeless orchid)NT (IUCN red list: Near threatened) NT (IUCN red list: Near threatened); USA ESA listing as threatened species USA ESA listing as threatened speciesAlabama; Georgia; Kentucky; South Carolina; Tennessee; VirginiaCompetition - monopolizing resourcesUS Fish and Wildlife Service, 2013
Sarracenia oreophila (green pitcherplant)CR (IUCN red list: Critically endangered) CR (IUCN red list: Critically endangered); USA ESA listing as endangered species USA ESA listing as endangered speciesAlabama; Georgia; North CarolinaCompetition (unspecified)Schnell et al., 2000
Sisyrinchium dichotomum (white irisette)USA ESA listing as endangered species USA ESA listing as endangered speciesNorth Carolina; South CarolinaCompetition - monopolizing resourcesUS Fish and Wildlife Service, 1995

Risk and Impact Factors

Top of page Invasiveness
  • Proved invasive outside its native range
  • Has a broad native range
  • Is a habitat generalist
  • Tolerates, or benefits from, cultivation, browsing pressure, mutilation, fire etc
  • Pioneering in disturbed areas
  • Long lived
  • Fast growing
  • Reproduces asexually
Impact outcomes
  • Damaged ecosystem services
  • Ecosystem change/ habitat alteration
  • Infrastructure damage
  • Modification of fire regime
  • Modification of hydrology
  • Modification of nutrient regime
  • Modification of successional patterns
  • Monoculture formation
  • Negatively impacts agriculture
  • Negatively impacts forestry
  • Negatively impacts livelihoods
  • Reduced amenity values
  • Reduced native biodiversity
  • Threat to/ loss of endangered species
  • Threat to/ loss of native species
Impact mechanisms
  • Competition - monopolizing resources
  • Competition - shading
  • Competition - smothering
  • Competition - strangling
  • Competition
  • Rapid growth
Likelihood of entry/control
  • Highly likely to be transported internationally deliberately
  • Difficult/costly to control


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In its native range in China and Japan, it is prized for its starch as a human food from the tubers and, as recently as 1977, Japanese production was approximately 338 tonnes annually (van der Maesen, 1985). However, the roots are laborious to collect and extract and a small starch factory in Anhui Province, China, failed in 1997 after only a few years' production although it is common in family gardens in many parts of China. Kudzu leaves, shoots and flowers can also be steamed or pickled and eaten as a vegetable (van der Maesen, 1985). Various parts of the plant are used as medicines and for the treatment of alcohol hangovers in China and Japan (Miller and Edwards, 1983; van der Maesen, 1985), and the tubers (or ‘radix’) are a common ingredient in Chinese herbal remedies.

As an exotic, kudzu was first introduced to the USA in 1876 as an ornamental plant for gardens (Shurtleff and Aoyagi, 1977). Later, kudzu was promoted as nutritious forage for livestock (Sturkie and Grimes, 1939; Dalal and Patnaik, 1963; Corley et al., 1997) but the yield is only 4-6 tonnes per hectare per year and it is difficult to cut and bale (Everest et al., 1991). In the 1930s and 1940s kudzu was actively planted as erosion control until it was recognized as a weed in the 1950s (Britton et al., 2002). However, when removed, soil nitrogen is higher than in uninvaded areas showing its ability as a green manure.

Uses List

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Animal feed, fodder, forage

  • Fodder/animal feed
  • Forage


  • Amenity
  • Erosion control or dune stabilization
  • Revegetation
  • Soil conservation
  • Soil improvement


  • Fuelwood

Human food and beverage

  • Flour/starch
  • Vegetable


  • Green manure
  • Wood/timber

Medicinal, pharmaceutical

  • Source of medicine/pharmaceutical
  • Traditional/folklore

Detection and Inspection

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Kudzu is widely established in eastern USA. It can be dispersed as seeds in soil or as an ornamental plant through mail order. A few small infestations have been eradicated in Oregon (Colquhoun, 2000) and kudzu is a quarantine-restricted plant for that state (USDA-NRCS, 2007). It has recently been recommended for phytosanitary measures in Europe as an A2 pest (EPPO, 2007), as small infestations have been noted from garden escapes in Switzerland. Also, there are concerns about potential future invasion in countries where it has been introduced but has not yet naturalised.

Similarities to Other Species/Conditions

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Kudzu is quite distinctive in the field in the USA. To separate kudzu from other species of Pueraria see van der Maesen (1985).

Prevention and Control

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The combination of extremely fast growth, ability to grow over other plants, root formation where nodes contact the ground, large storage tubers and few natural enemies in the USA makes kudzu a challenge to control. Treatment coverage is probably the most difficult problem. Due to the extreme growth rate, every root crown in the area must be killed or repopulation will occur (Miller and Edwards, 1983). Various cultural and chemical control methods have been attempted and, with intensive effort, it is possible to protect a limited area, however, the vast reservoir of kudzu on the edges of forests and marginal lands, where access is limited, makes it unlikely that kudzu will be permanently controlled by any means other than classical biological control.

Cultural control

Persistent application of cultural methods can be effective in certain situations. Monthly close mowing for two growing seasons effectively starving the roots, can be successful in flat open areas (Ball et al., 1979). Equally, heavy grazing by cows, pigs, horses or goats (Rhoden et al., 1991) can remove kudzu but there are associated problems: animals cannot eat vines growing over trees or in steep areas; they must be penned on the kudzu; watering holes must be provided; and there must be enough livestock to ensure 80% of the kudzu is continuously consumed (Ball et al., 1979; Miller and Edwards, 1983). Although kudzu is nutritious for livestock (Sturkie and Grimes, 1939; Dalal and Patnaik 1963; Corley et al., 1997), cattle do not favour it when it is trampled and horses need to become adapted to it (Hintz, 1993).

Combinations of cultural methods can be effective. The St Regis Paper Co. converted land in Stewart County, Georgia, USA which was partially overrun with kudzu, to a pine plantation in 1967 by burning the kudzu after it was killed by autumn frost, removing merchantable timber and knocking down unmarketable trees so kudzu couldn't grow over them, and then running cattle for 2 years until no kudzu remained on the flat areas. The kudzu that was growing in gullies where the cows could not reach it was chemically treated and loblolly pine (Pinus taeda) seedlings were planted in pasture areas. Yield from areas formerly covered by kudzu exceeded yield from adjacent areas that had no kudzu and soil samples from both areas showed that the kudzu soil was richer in organic matter and had higher levels of all elements tested except phosphorus (Robertson, 1997).

Mechanical control

Frequent close cutting will eventually exhaust the plants stored reserves leading to plant death (PIER, 2007).

Chemical control

Effective chemical control of kudzu is possible but it may require repeated application of herbicides over a period of 4-10 years (Nelson, 1997). Many herbicides have been tested against kudzu (Davis and Funderburk, 1964; Martin and Miller, 1981; Michael, 1982;Miller, 1982,1985,1986,1988; Miller and Edwards, 1983; Miller and True, 1986;Smith, 1988,1990; Kay and Hoyle, 1997). Selection of an appropriate treatment depends on several factors including age and vigour of the kudzu, roughness of the terrain, proximity to streams or ponds and the value of other crops or trees present on the site. As with cultural control, kudzu will return if even a single root crown is left untreated, though several procedures can improve the effectiveness of herbicide treatment. Prescribed burning early in the spring will kill small kudzu plants and sever stems draped over trees. It will also reveal application hazards, which can then be marked, and expose root crowns. The size of root crowns indicates the age of the kudzu patch. Typically, patches more than 10 years old require twice as much herbicide as younger patches (Miller, 1991). If possible, trees should be logged prior to treatment and draping stems should be severed. The recommended application technique includes outlining the area to be treated followed by back and forth overlapping swaths and then cross-wise spray swaths perpendicular to the initial swaths, and near streams, application should follow the stream shape using double overlapping swaths (Miller, 1991).

Biological control

Biological control is an important element of an integrated kudzu management system, and many pathogens have been isolated from kudzu and include microorganisms native and non-native to the USA. Those native to the USA include Pseudomonas syringae pv. phaseolicola [P. savastanoi pv. phaseolicola] which causes halo blight of legume plants such as beans and kudzu. The symptoms are described as small necrotic leaf spots surrounded by bright halos of chlorotic tissue. This pathogen was tested for its potential as a biological control agent of kudzu by Zidak and Backman (1996). They found it was capable of causing mortality on both young and old kudzu seedlings, however, secondary infections under dry conditions in the field were very limited.

Boyette et al. (2001,2002) tested the effectiveness of another US native fungus, Myrothecium verrucaria, as a biological control agent for kudzu. This fungus was isolated in 1997 from infected Senna obtusifolia, and showed dramatic potential for biological control of various weed species when formulated, even in the absence of environmental dew (Walker and Tilley, 1997). The USDA-ARS biological control team showed that M. verrucaria applied at a high spore rate of 2x108 conidia/ml caused greater than 90% mortality of both young and old kudzu seedlings. They also determined that the disease severity increased with an increase in temperature to 30-40°C, suggesting that this mycoherbicide could be very active in the summer in the southern USA. The virulence of M. verrucaria against kudzu was increased in formulation with an organosilicon surfactant to cause 100% mortality of kudzu in the greenhouse and in the field 2 weeks after spraying at a rate of 2x107. As fungal activity requires the surfactant, the risk of the fungus spreading beyond the sprayed field is minimal. Eight to ten toxic macrocyclic trichothecenes (Abbas et al., 2001,2002) were found in extracts of M. verrucaria, the specific number depending on the type of tissue used, growing conditions and type of growth medium (Abbas et al., 2001). In all cases at least two very potent toxins were produced, however, none of the mycotoxins were detected in target plant tissues (kudzu, Senna obtusifolia or soyabean) after spraying with M. verrucaria. The combination of surfactant-limited activity, high efficacy and lack of residual toxins add to the appeal of M. verrucaria as a potential biological central agent for kudzu. However, concerns about the toxicity of the macrocyclic trichothecenes to humans and livestock (Jarvis et al., 1985) and the high mammalian toxicity as noted by Abbas et al. (2002) indicate that extreme care should be exercised when handling mycelium, spores or any other type of formulation for field application. Further investigations may discover other strains and/or techniques for producing fungus inoculum free from potent toxins.

Some isolates of Colletotrichum gloeosporioides [Glomerella cingulata] are well established as biocontrol agents of various weeds including the mycoherbicide 'Collego' (Smith, 1986). A specific isolate of this fungus was obtained from kudzu in Houston County, Georgia, USA, and its virulence was increased by several selections for growth on a Czapek Dox medium amended with kudzu extract. This isolate showed dramatic effects on both leaves and vines and produced conidia in a pycnidium which could be used for secondary infection (Farris and Reilly, 2000). In the USA, several fungi, including Alternaria and Fusarium species, are being developed as potential biocontrol agents against a variety of weeds and have been tested against kudzu. In greenhouse and field experiments, kudzu seedling mortality has been achieved with preparations of A. helianthi, F. solani and F. polyphialidicum (Abbas et al., 1991; Abbas et al., 1995a,b,1996a,b; Abbas and Barrentine, 1995; Abbas and Boyette, 1996). Although an attempt was made to use the soyabean rust pathogen Phakopsora pachyrhizi for biological control of kudzu in the USA, there is a concern that it might affect soyabean crops (G Hartman, National Soybean Research Center, Urbana, Illinois, personal communication, 2003).


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Links to Websites

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GISD/IASPMR: Invasive Alien Species Pathway Management Resource and DAISIE European Invasive Alien Species Gateway source for updated system data added to species habitat list.
Global register of Introduced and Invasive species (GRIIS) source for updated system data added to species habitat list.


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28/11/2007 Updated by:

Nick Pasiecznik, Consultant, France

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