Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Datasheet

Galinsoga parviflora
(gallant soldier)

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Datasheet

Galinsoga parviflora (gallant soldier)

Summary

  • Last modified
  • 08 November 2018
  • Datasheet Type(s)
  • Invasive Species
  • Pest
  • Host Plant
  • Preferred Scientific Name
  • Galinsoga parviflora
  • Preferred Common Name
  • gallant soldier
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Plantae
  •     Phylum: Spermatophyta
  •       Subphylum: Angiospermae
  •         Class: Dicotyledonae
  • Summary of Invasiveness
  • G. parviflora is a cosmopolitan fast-growing annual herb with the capacity to invade agricultural and other disturbed areas in most temperate and subtropical regions of the world (

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Pictures

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PictureTitleCaptionCopyright
Growth habit.
TitleHabit
CaptionGrowth habit.
Copyright©Sheldon Navie
Growth habit.
HabitGrowth habit.©Sheldon Navie
Growth habit.
TitleHabit
CaptionGrowth habit.
Copyright©Sheldon Navie
Growth habit.
HabitGrowth habit.©Sheldon Navie
Flowers and leaves.
TitleFlowers
CaptionFlowers and leaves.
Copyright©Sheldon Navie
Flowers and leaves.
FlowersFlowers and leaves.©Sheldon Navie
Leaves simple-opposite, lower leaves with petioles, upper ones without. Leaf blade oval to oblong with sharp apex. Composite flowers 5-8 mm across, borne on long acillary peduncles. Each capitulum bears two types of flower: ligulate female white flowers at the margin and tubular hermaphrodite yellow flowers in the central disc.
TitleG. parviflora plants
CaptionLeaves simple-opposite, lower leaves with petioles, upper ones without. Leaf blade oval to oblong with sharp apex. Composite flowers 5-8 mm across, borne on long acillary peduncles. Each capitulum bears two types of flower: ligulate female white flowers at the margin and tubular hermaphrodite yellow flowers in the central disc.
CopyrightEduardo Leguizamon
Leaves simple-opposite, lower leaves with petioles, upper ones without. Leaf blade oval to oblong with sharp apex. Composite flowers 5-8 mm across, borne on long acillary peduncles. Each capitulum bears two types of flower: ligulate female white flowers at the margin and tubular hermaphrodite yellow flowers in the central disc.
G. parviflora plantsLeaves simple-opposite, lower leaves with petioles, upper ones without. Leaf blade oval to oblong with sharp apex. Composite flowers 5-8 mm across, borne on long acillary peduncles. Each capitulum bears two types of flower: ligulate female white flowers at the margin and tubular hermaphrodite yellow flowers in the central disc.Eduardo Leguizamon
Young seedling.
TitleSeedling
CaptionYoung seedling.
Copyright©Sheldon Navie
Young seedling.
SeedlingYoung seedling.©Sheldon Navie

Identity

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Preferred Scientific Name

  • Galinsoga parviflora Cav.

Preferred Common Name

  • gallant soldier

Other Scientific Names

  • Adventina parviflora (Cav.) Raf.
  • Baziasa microglossa Steud.
  • Galinsoga hirsuta Baker
  • Galinsoga laciniata Retz.
  • Galinsoga quinqueradiata Ruiz & Pav.
  • Sabazia microglossa DC.
  • Stemmatella sodiroi Hieron.
  • Vigolina acmella (Roth) Poir.
  • Wiborgia acmella Roth
  • Wiborgia parviflora (Cav.) Kunth

International Common Names

  • English: chickweed; French soldier; Peruvian daisy; quickweed; small-flower galinsoga
  • Spanish: boton de oro (Dominican Republic); chumica; escabiosa (Chile); moderna; soldado galante
  • French: Galinsoga à petites fleurs; piquant blanc
  • Chinese: niu xi ju
  • Portuguese: botao-de-ouro; erva-da-moda; picao-branco; picao-bravo

Local Common Names

  • Angola: okalume; onglo
  • Argentina: albahaca silvestre; Botón de oro; picao bravo; saetilla; small flower galinsoga
  • Australia: chick weed; potato weed; yellow weed
  • Brazil: botao de ouro; fazendeiro; picao branco
  • Canada: small-flowered galinsoga; yellow galinsoga
  • Chile: pacuyuyo
  • Colombia: guasco
  • Dominican Republic: yerba boba
  • Ethiopia: abadabbo
  • Germany: Franzosenkraut (Kleinblütiges); Galinzago; Gängelkraut; kleinblütiges Franzosenkraut; kleinblütiges Knopfkraut; Knopfkraut
  • Haiti: herbe aiguiles
  • India: marchia; pardesi
  • Indonesia: balakatjioet losih; bribel
  • Italy: galinsoga
  • Japan: hakidamegiku
  • Kenya: macdonaldi
  • Mexico: rosilla chica
  • Netherlands: knopkruid
  • Pakistan: khanna
  • Peru: chuminca
  • South Africa: quick weed
  • Sweden: tandgängel
  • Uganda: kofume
  • USA: littleflower quickweed
  • Venezuela: canilla de blanca
  • Zimbabwe: kew weed

EPPO code

  • GASPA (Galinsoga parviflora)

Summary of Invasiveness

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G. parviflora is a cosmopolitan fast-growing annual herb with the capacity to invade agricultural and other disturbed areas in most temperate and subtropical regions of the world (Holm et al., 1979). It is highly competitive and can spread quickly, often being the dominant species in a field. G. parviflora generates considerable economic impact on crop systems, greenhouses, gardens and nurseries. It is listed as an invasive and noxious weed in North America, Europe, Asia, Australia, and on islands in the Pacific Ocean (see Distribution Table for details). 

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Plantae
  •         Phylum: Spermatophyta
  •             Subphylum: Angiospermae
  •                 Class: Dicotyledonae
  •                     Order: Asterales
  •                         Family: Asteraceae
  •                             Genus: Galinsoga
  •                                 Species: Galinsoga parviflora

Notes on Taxonomy and Nomenclature

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The genus Galinsoga is named after M. M. Galinsoga, Head of Madrid Botanical Garden in 1880. The name Galinsoga parviflora is derived from the Latin parvu (little) and flore (flower). A revision of the genus Galinsoga (Compositae: Helianthae) was made by Canne (1977).

Although most authorities treat the closely related G. ciliata as a separate species, these two species are almost certain sometimes to be confused in the weed science literature. This account deals primarily with G. parviflora in the stricter sense, but some records or observations may relate more correctly to G. ciliata. See Similarities to Other Species for their distinguishing features.

Description

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G. parviflora is herbaceous, erect and 20-80 cm tall, depending on growing conditions. Leaves are simple-opposite, the lower leaves with petioles, the upper ones without petioles. Leaf blade oval to oblong with sharp apex. The inflorescence consists of typical Compositae/Asteraceae composite flowers, each 5-8 mm across, borne on long acillary peduncles. Each 'flower'/capitulum bears two types of flower: ligulate female white flowers at the margin and tubular hermaphrodite yellow flowers in the central disc (Kissmann and Groth, 1993). Two types of achenes are present: peripheral (1.5-2 x 0.4-0.7 mm) and central (1.1-1.5 x 0.4-0.5 mm). Both types are black. The dispersal units are achenes bearing pappus or parts of flower structures (involucral bractea and the two paleas) that can easily be transported by wind or animals.

Plant Type

Top of page Annual
Broadleaved
Herbaceous
Seed propagated

Distribution

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G. parviflora is an American weed, and its centre of origin is considered to be the mountainous area of Mesoamerica (i.e., Mexico and Central America; Vibrans, 2009). Because this species was first described from material collected in South America (a cultivated plant from Peru), it has been erroneously cited as native to this part of the world (Vibrans, 2009). Currently, G. parviflora is a cosmopolitan species widely distributed in North America, Europe, Africa, Asia and Australasia. It is considered a weed in at least 40 countries, mostly temperate and sub-tropical but also at higher altitudes in many tropical countries (Holm et al., 1979). 

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

Asia

AfghanistanPresent
ArmeniaPresentIntroduced Invasive USDA-ARS, 2014
AzerbaijanPresentIntroducedUSDA-ARS, 2014Casual alien
BhutanWidespreadParker, 1992; USDA-ARS, 2014
CambodiaPresentIntroduced Invasive Holm et al., 1979
China
-BeijingPresentIntroduced Invasive Wang et al., 2011
-GuangxiPresentIntroduced Invasive Liu et al., 2006Weed
-GuizhouPresentIntroduced Invasive Liu et al., 2006Weed
-HainanPresentIntroduced Invasive Liu et al., 2006Weed
-HebeiPresentIntroduced Invasive Liu et al., 2006Weed
-Hong KongPresentIntroduced Invasive Wu, 2001
-SichuanPresentIntroduced Invasive Liu et al., 2006Weed
-TibetPresentIntroduced Invasive Liu et al., 2006Weed
-YunnanPresentIntroduced Invasive Liu et al., 2006Weed
Georgia (Republic of)PresentIntroducedUSDA-ARS, 2014Naturalized
IndiaWidespreadNeogi and Rao, 1980; Nankar et al., 1981
-Arunachal PradeshPresentIntroduced Invasive Chandra, 2012
-Himachal PradeshPresentIntroduced Invasive Rana, 2002; Chandra, 2012Weed
-Jammu and KashmirPresentIntroduced Invasive Chandra, 2012
-KarnatakaPresent
-Madhya PradeshPresentParadkar et al., 2002
-ManipurPresentIntroduced Invasive Chandra, 2012
-MeghalayaPresentIntroduced Invasive Chandra, 2012
-MizoramPresentIntroduced Invasive Chandra, 2012
-NagalandPresentIntroduced Invasive Chandra, 2012
-SikkimPresentIntroduced Invasive Chandra, 2012
-TripuraPresentIntroduced Invasive Chandra, 2012
-Uttar PradeshPresentIntroduced Invasive Chandra, 2012
-UttarakhandWidespreadPandey et al., 2002; Chandra, 2012
-West BengalPresentIntroduced Invasive Chandra, 2012
IndonesiaPresentIntroduced Invasive Waterhouse, 1993
IranPresentIntroducedUSDA-ARS, 2014
IsraelPresentIntroducedUSDA-ARS, 2014Casual alien
JapanPresentIntroduced Invasive Usami, 1976; Mito and Uesugi, 2004
Korea, Republic ofWidespreadKang et al., 1996
LebanonPresent
MalaysiaPresentIntroduced Invasive Holm et al., 1979
NepalPresentIntroducedUSDA-ARS, 2014Naturalized
PakistanPresentIntroducedUSDA-ARS, 2014Naturalized
PhilippinesWidespreadIntroduced Invasive Waterhouse, 1993
Sri LankaPresentIntroducedUSDA-ARS, 2014Naturalized
TaiwanPresentIntroducedHsu, 1973; Holm et al., 1979; Sun and Huang, 1995
ThailandPresentIntroduced Invasive Waterhouse, 1993
TurkeyPresentEPPO, 2014; USDA-ARS, 2014
YemenWidespreadWalter, 1981; USDA-ARS, 2014

Africa

AngolaPresentIntroducedUSDA-ARS, 2014Naturalized
BotswanaPresentIntroducedUSDA-ARS, 2014Naturalized
BurundiPresentIntroducedUSDA-ARS, 2014Naturalized
CameroonPresentIntroducedUSDA-ARS, 2014Naturalized
Cape VerdePresentIntroducedUSDA-ARS, 2014Naturalized
CongoPresentNgongo and Lunze, 2000
Congo Democratic RepublicPresentIntroducedUSDA-ARS, 2014Naturalized
EgyptPresentIntroducedUSDA-ARS, 2014Naturalized
EritreaPresentIntroducedUSDA-ARS, 2014Naturalized
EthiopiaWidespreadTessema et al., 1999; EPPO, 2014; USDA-ARS, 2014
KenyaWidespreadWaithaka, 1976; Maina et al., 2001; USDA-ARS, 2014
LesothoPresentIntroducedUSDA-ARS, 2014
MadagascarPresentIntroducedUSDA-ARS, 2014Naturalized
MalawiPresentIntroducedTerry and Michieka, 1987; USDA-ARS, 2014Naturalized
MauritiusPresentIntroduced Invasive PIER, 2014
MozambiquePresent
NigeriaPresentIntroducedUSDA-ARS, 2014Naturalized
RéunionPresentIntroduced Invasive PIER, 2014
RwandaPresentIntroducedUSDA-ARS, 2014Naturalized
Saint HelenaPresentIntroducedUSDA-ARS, 2014Naturalized
SomaliaPresentIntroducedUSDA-ARS, 2014Naturalized
South AfricaWidespreadToit and Court-de-Billot, 1991; USDA-ARS, 2014
Spain
-Canary IslandsPresentIntroducedUSDA-ARS, 2014Naturalized
SudanPresentIntroducedUSDA-ARS, 2014; USDA-ARS, 2014
SwazilandPresentIntroducedUSDA-ARS, 2014Naturalized
TanzaniaWidespreadOwenya et al., 1987; Moyer et al., 1989; USDA-ARS, 2014
TunisiaRestricted distributionEPPO, 2014
UgandaPresentUgen et al., 2002; USDA-ARS, 2014
ZambiaPresentUSDA-ARS, 2014
ZimbabweWidespreadSchwerzel et al., 1979; USDA-ARS, 2014

North America

CanadaWidespreadCanne, 1977; Warwick and Sweet, 1983
-British ColumbiaPresentIntroduced Invasive USDA-ARS, 2014
-ManitobaPresentIntroduced Invasive USDA-ARS, 2014
-New BrunswickPresentIntroduced Invasive USDA-ARS, 2014
-OntarioPresentIntroduced Invasive USDA-ARS, 2014
-QuebecPresentIntroduced Invasive USDA-ARS, 2014Naturalized
MexicoWidespreadNativeMartinez et al., 1983; Amador Ramirez, 2002; USDA-ARS, 2014
USA
-AlabamaPresentIntroducedUSDA-NRCS, 2014
-ArizonaPresentIntroduced Invasive USDA-NRCS, 2014
-ArkansasPresentIntroducedUSDA-NRCS, 2014
-CaliforniaPresentIntroduced Invasive USDA-NRCS, 2014
-ColoradoPresentIntroduced Invasive USDA-NRCS, 2014
-ConnecticutPresentIntroduced Invasive USDA-NRCS, 2014
-District of ColumbiaPresentIntroducedUSDA-NRCS, 2014
-GeorgiaPresentIntroducedUSDA-NRCS, 2014
-HawaiiPresentIntroduced Invasive Wagner et al., 1999
-IllinoisPresentIntroduced Invasive USDA-NRCS, 2014
-IndianaPresentIntroducedUSDA-NRCS, 2014
-IowaPresentIntroducedUSDA-NRCS, 2014
-KansasPresentIntroducedUSDA-NRCS, 2014
-KentuckyPresentIntroducedUSDA-NRCS, 2014
-MainePresentIntroducedUSDA-NRCS, 2014
-MarylandPresentIntroducedUSDA-NRCS, 2014
-MassachusettsPresentIntroduced Invasive USDA-NRCS, 2014
-MichiganPresentIntroduced Invasive USDA-NRCS, 2014
-MinnesotaPresentIntroduced Invasive USDA-NRCS, 2014
-MissouriPresentIntroducedUSDA-NRCS, 2014
-NebraskaPresentIntroduced Invasive USDA-NRCS, 2014
-New HampshirePresentIntroduced Invasive USDA-NRCS, 2014
-New JerseyPresentIntroducedUSDA-NRCS, 2014
-New MexicoPresentIntroduced Invasive USDA-NRCS, 2014
-New YorkPresentIntroduced Invasive USDA-NRCS, 2014
-North CarolinaPresentIntroducedUSDA-NRCS, 2014
-North DakotaPresentIntroduced Invasive USDA-NRCS, 2014
-OhioPresentIntroducedGao et al., 1999
-OklahomaPresentIntroducedUSDA-NRCS, 2014
-OregonPresentIntroducedUSDA-NRCS, 2014
-PennsylvaniaPresentIntroduced Invasive USDA-NRCS, 2014
-Rhode IslandPresentIntroduced Invasive USDA-NRCS, 2014
-South CarolinaPresentIntroducedUSDA-NRCS, 2014
-TennesseePresentIntroducedUSDA-NRCS, 2014
-TexasPresentIntroduced Invasive USDA-NRCS, 2014
-VermontPresentIntroduced Invasive USDA-NRCS, 2014
-VirginiaPresentIntroducedUSDA-NRCS, 2014
-WashingtonPresentIntroduced Invasive USDA-NRCS, 2014
-West VirginiaPresentIntroducedUSDA-NRCS, 2014
-WisconsinPresentIntroducedUSDA-NRCS, 2014

Central America and Caribbean

Antigua and BarbudaPresentBroome et al., 2007Uncertain if native or introduced
Costa RicaPresentNativeDavidse et al., 2014
Dominican RepublicPresentNativeUSDA-ARS, 2014
El SalvadorPresentNativeDavidse et al., 2014
GuadeloupePresentAcevedo-Rodriguez and Strong, 2012
GuatemalaRestricted distributionBatra, 1979
HaitiPresentNativeUSDA-ARS, 2014
JamaicaPresentNativeUSDA-ARS, 2014
MartiniquePresentBroome et al., 2007Uncertain if native or introduced
NicaraguaPresentNativeDavidse et al., 2014
Puerto RicoPresentNativeUSDA-ARS, 2014

South America

ArgentinaPresent Invasive Cabrera and, 1963; Mitidieri and Bianchini, 1973; Nobile et al., 2002; USDA-ARS, 2014
BoliviaPresentUSDA-ARS, 2014Probably introduced. Now naturalized.
Brazil
-AcrePresentLorenzi, 1982
-AlagoasPresentLorenzi, 1982
-AmazonasPresentLorenzi, 1982
-BahiaPresentLorenzi, 1982
-CearaPresentLorenzi, 1982
-Espirito SantoPresentLorenzi, 1982
-Fernando de NoronhaPresentLorenzi, 1982
-GoiasPresentLorenzi, 1982
-MaranhaoPresentLorenzi, 1982
-Mato GrossoPresentLorenzi, 1982
-Mato Grosso do SulPresentLorenzi, 1982
-Minas GeraisPresentLorenzi, 1982; Laca-Buendia and Brandao, 1994
-ParaPresentLorenzi, 1982
-ParaibaPresentLorenzi, 1982
-ParanaWidespreadLorenzi, 1982; Zagonel et al., 2000; Mondin, 2014
-PernambucoPresentLorenzi, 1982
-PiauiPresentLorenzi, 1982
-Rio de JaneiroPresentLorenzi, 1982
-Rio Grande do NortePresentLorenzi, 1982
-Rio Grande do SulPresentLorenzi, 1982; Mondin, 2014
-RondoniaPresentLorenzi, 1982
-Santa CatarinaPresentLorenzi, 1982; Mondin, 2014
-Sao PauloPresentLorenzi, 1982; Mondin, 2014
-SergipePresentLorenzi, 1982
ChileWidespreadFinot et al., 1996; Russo et al., 2001; I3N-Chile, 2014
-Easter IslandPresentIntroduced Invasive I3N-Chile, 2014
ColombiaRestricted distributionMontenegro-Gálvez and Criollo-Escobar, 1978; USDA-ARS, 2014
EcuadorPresentUSDA-ARS, 2014Probably introduced. Now naturalized
ParaguayRestricted distributionCabrera and, 1963; Grosse, 1996
PeruRestricted distributionUSDA-ARS, 2014
UruguayRestricted distributionCabrera and, 1963; USDA-ARS, 2014
VenezuelaPresent

Europe

AlbaniaPresentIntroducedUSDA-ARS, 2014Naturalized
AustriaPresentSteden and Schulte, 2000; USDA-ARS, 2014
BelarusPresentIntroducedUSDA-ARS, 2014Naturalized
BelgiumRestricted distributionGofflot and Verhoyen, 1990; DAISIE, 2014
Bosnia-HercegovinaPresentIntroducedNaturalized
BulgariaPresentKonstantinov and Nikolova, 1983; Toskov and Dimitrova, 2002; DAISIE, 2014
CroatiaWidespreadPandza et al., 2001; DAISIE, 2014
CyprusPresentIntroducedUSDA-ARS, 2014Casual alien
Czech RepublicPresentMertelík et al., 1996; DAISIE, 2014
Czechoslovakia (former)PresentDAISIE, 2014
DenmarkPresentDAISIE, 2014
EstoniaPresentIntroducedDAISIE, 2014Naturalized
FinlandPresentDAISIE, 2014
FranceRestricted distributionDAISIE, 2014
-CorsicaPresentIntroducedDAISIE, 2014Naturalized
GermanyPresentHilbig and Mahn, 1971; Schmidt, 1986; Steden and Schulte, 2000; DAISIE, 2014
GreeceRestricted distributionDAISIE, 2014
HungaryRestricted distributionDAISIE, 2014
IrelandPresentIntroducedDAISIE, 2014
ItalyPresentCantele et al., 1984; DAISIE, 2014
LatviaPresentIntroducedDAISIE, 2014
LiechtensteinPresentIntroducedDAISIE, 2014
LithuaniaPresentZinikeviciute and Baleliunas, 1998; DAISIE, 2014
LuxembourgPresentIntroducedDAISIE, 2014Naturalized
MacedoniaPresentIntroducedDAISIE, 2014Casual alien
MoldovaPresentIntroducedDAISIE, 2014Casual alien
MontenegroPresentIntroducedUSDA-ARS, 2014Casual alien
NetherlandsPresentDAISIE, 2014
NorwayWidespreadGreve, 2001; DAISIE, 2014
PolandWidespreadChoroszewski, 1994; Zajac and Zajac, 2001; Klikocka and Wesolowski, 2002; DAISIE, 2014
PortugalPresentDAISIE, 2014
-AzoresPresentDAISIE, 2014
-MadeiraPresentIntroducedDAISIE, 2014Naturalized
RomaniaWidespreadSlonovschi, 1982; Chirita et al., 1998; DAISIE, 2014
Russian FederationPresentSafonov, 1992; USDA-ARS, 2014
SerbiaPresentEPPO, 2014; USDA-ARS, 2014
SlovakiaPresentIntroducedUSDA-ARS, 2014Casual alien
SloveniaPresentIntroducedDAISIE, 2014Naturalized
SpainWidespreadGarcía, 1985; Bosque and Izquierdo, 1997; DAISIE, 2014
SwedenPresentDAISIE, 2014
SwitzerlandRestricted distributionStalder, 1978; DAISIE, 2014
UKPresentDAISIE, 2014
UkraineWidespreadGamor et al., 1983; DAISIE, 2014
Yugoslavia (former)WidespreadHulina, 1978; Muminovic, 1990

Oceania

AustraliaRestricted distributionShukla et al., 1979; Macleod and Frost, 2002; EPPO, 2014
-Australian Northern TerritoryPresentIntroduced Invasive Murray, 1992
-Lord Howe Is.PresentIntroduced Invasive Murray, 1992
-New South WalesPresentIntroduced Invasive Murray, 1992
-QueenslandPresentIntroduced Invasive Murray, 1992
-South AustraliaPresentIntroducedMurray, 1992Naturalized
-TasmaniaPresentIntroducedMurray, 1992Naturalized
-VictoriaPresentIntroducedMurray, 1992Naturalized
French PolynesiaPresentIntroducedUSDA-ARS, 2014Naturalized
New ZealandPresentIntroduced Invasive USDA-ARS, 2014
Norfolk IslandPresentIntroduced Invasive Orchard, 1994
Papua New GuineaPresentIntroduced Invasive PIER, 2014
VanuatuPresentIntroduced Invasive PIER, 2014

Habitat List

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CategoryHabitatPresenceStatus
Littoral
Coastal areas Present, no further details Harmful (pest or invasive)
Terrestrial-managed
Cultivated / agricultural land Present, no further details Harmful (pest or invasive)
Disturbed areas Present, no further details Harmful (pest or invasive)
Managed forests, plantations and orchards Present, no further details
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)
Protected agriculture (e.g. glasshouse production) Present, no further details
Rail / roadsides Present, no further details Harmful (pest or invasive)
Urban / peri-urban areas Present, no further details Harmful (pest or invasive)
Terrestrial-natural/semi-natural
Deserts Present, no further details
Natural forests Present, no further details Harmful (pest or invasive)
Natural grasslands Present, no further details Harmful (pest or invasive)
Riverbanks Present, no further details Harmful (pest or invasive)
Wetlands Present, no further details Harmful (pest or invasive)

Host Plants and Other Plants Affected

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Plant nameFamilyContext
Allium cepa (onion)LiliaceaeMain
Allium sativum (garlic)LiliaceaeMain
Apium graveolens (celery)ApiaceaeMain
Arachis hypogaea (groundnut)FabaceaeMain
Asparagus densiflorus (asparagus fern)LiliaceaeMain
Avena sativa (oats)PoaceaeMain
Beta vulgaris var. saccharifera (sugarbeet)ChenopodiaceaeMain
Brassica carinata (African cabbage)BrassicaceaeMain
Brassica oleracea var. botrytis (cauliflower)BrassicaceaeMain
Brassica oleracea var. capitata (cabbage)BrassicaceaeMain
Brassica rapa subsp. oleifera (turnip rape)BrassicaceaeMain
Capsicum annuum (bell pepper)SolanaceaeMain
Chrysanthemum (daisy)AsteraceaeMain
Chrysanthemum vestitumAsteraceaeMain
CitrusRutaceaeMain
Coffea (coffee)RubiaceaeMain
Cucumis sativus (cucumber)CucurbitaceaeMain
Cucurbita moschata (pumpkin)CucurbitaceaeMain
Daucus carota (carrot)ApiaceaeMain
Dianthus caryophyllus (carnation)CaryophyllaceaeMain
Echinochloa frumentacea (Japanese millet)PoaceaeMain
Eleusine coracana (finger millet)PoaceaeMain
Fabaceae (leguminous plants)FabaceaeMain
FreesiaIridaceaeMain
Gerbera (Barbeton daisy)AsteraceaeMain
Gladiolus hybrids (sword lily)IridaceaeMain
Glycine max (soyabean)FabaceaeMain
Gossypium (cotton)MalvaceaeMain
Helianthus annuus (sunflower)AsteraceaeMain
Hordeum vulgare (barley)PoaceaeMain
Impatiens (balsam)BalsaminaceaeMain
Inula helenium (Elecampane)AsteraceaeMain
Lactuca sativa (lettuce)AsteraceaeMain
Lens culinaris subsp. culinaris (lentil)FabaceaeMain
Limonium sinuatum (sea pink)PlumbaginaceaeMain
Malus domestica (apple)RosaceaeMain
Nicotiana tabacum (tobacco)SolanaceaeMain
Oryza sativa (rice)PoaceaeMain
Phacelia tanacetifolia (California bluebell)HydrophyllaceaeMain
Phaseolus vulgaris (common bean)FabaceaeMain
Pinus caribaea (Caribbean pine)PinaceaeMain
Pisum sativum (pea)FabaceaeMain
Prunus persica (peach)RosaceaeMain
Rosa (roses)RosaceaeMain
Sambucus nigra (elder)CaprifoliaceaeMain
Secale cereale (rye)PoaceaeMain
Solanum lycopersicum (tomato)SolanaceaeMain
Solanum melongena (aubergine)SolanaceaeMain
Solanum tuberosum (potato)SolanaceaeMain
Sorghum bicolor (sorghum)PoaceaeMain
Spinacia oleracea (spinach)ChenopodiaceaeMain
Triticum (wheat)PoaceaeMain
Triticum aestivum (wheat)PoaceaeMain
Vicia faba (faba bean)FabaceaeMain
Vigna unguiculata (cowpea)FabaceaeMain
Zantedeschia (calla-lilies)AraceaeMain
Zea mays (maize)PoaceaeMain

Growth Stages

Top of page Pre-emergence, Seedling stage, Vegetative growing stage

Biology and Ecology

Top of page

Genetics

The chromosome number reported for G. parviflora is 2n=16 (Canne, 1983).

Physiology and Phenology

G. parviflora exhibits an early summer flush characterized by high peaks (Toit and Cout-de-Billot, 1991). Germination was observed from late March until early November, during which 3-4 generations took place. One plant produced 13,400 capitula in its lifetime and produced 400,000 seeds. Stem height and leaf area increased more in summer-germinating plants than plants germinating in the spring or autumn, growth rate of G. parviflora being dependent on season of germination.

Germination of exposed seeds is highest in the first year, suggesting that many seeds either germinate or die before the second year. Within two years all exposed seeds are dead. Laboratory tests confirm that exposed seeds lose viability more rapidly than buried seeds, and that the deeper the seeds are buried, the better they retain viability (Schwerzel et al., 1979).

Longevity

G. parviflora is an annual weed with a short life cycle, often less than 40 days, which can occur in the autumn, spring or summer in temperate areas and at any time of year in the tropics.

Population Size and Structure

Galinsoga parviflora exhibits density-dependent mortality, which increases at a higher nitrogen level. At lower densities the plant grows more vigorously in a mixture than compared to pure stands, but at higher densities it was completely suppressed by G. quadriradiata (Rai and Tripathi, 1986).

Nutrition

Shoot extracts of G .parviflora increased soil pH and reduced aluminium down to a depth of 20 cm when applied to the soil surface as a lime top dressing and leached with 3 pore volumes of deionised water (Meda et al., 2002).

Environmental Requirements

Sun species, among them G. parviflora, were more competitive with shade species at high light intensities, whereas at low light, the competitive ability depended on the initial weight of the plant (Corre, 1984). Rai and Tripathi (1986) showed that G. parviflora was very sensitive to shading.

G. parviflora is a C3 plant (Kissmann and Groth, 1993). High temperature seems to enhance growth, flowering and maturity. It is inferred that Galinsoga belongs to a type of weed of which the seed is light sensitive (Usami, 1976). Rate of germination is stimulated by alternating temperatures, with the highest rate at a day temperature of 30°C and a night temperature of 20°C, with a 16-hour photoperiod and 11,000 lux. The germination of irradiated seeds in the laboratory decreases as the red:far-red light ratio decreases in the range from 2 to 0.04 (Zweep et al., 1990).

Air Temperature

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Parameter Lower limit Upper limit
Absolute minimum temperature (ºC) 1
Mean annual temperature (ºC) 1 40
Mean maximum temperature of hottest month (ºC) 30 40
Mean minimum temperature of coldest month (ºC) 2 10

Rainfall

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ParameterLower limitUpper limitDescription
Mean annual rainfall5001500mm; lower/upper limits

Rainfall Regime

Top of page Summer

Soil Tolerances

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Soil drainage

  • seasonally waterlogged

Soil reaction

  • acid

Soil texture

  • heavy
  • medium

Special soil tolerances

  • shallow

Natural enemies

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Natural enemyTypeLife stagesSpecificityReferencesBiological control inBiological control on
Galinsoga mosaic virus Pathogen

Notes on Natural Enemies

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Many of the natural enemies mentioned here are polyphagous species. Batra (1979) comments that host-specific natural enemies should be sought in the area of origin of the weed in the mountainous regions of Latin America.

Fungi: G. parviflora is a host to Plasmopara yunnannensis (Tao and Qin, 1987) and seeds have been found bearing more than 15 fungal species (among them Alternaria, Ascochyta, Penicillum, Phoma, Drechslera, Trichoderma, Fusarium and Botrytis sp.) (Lorenzi, 1986; Prete et al., 1986). Ten fungal species were identified infecting G. ciliata and G. parviflora, the most notable being Glomerella cingulata, the causal agent of anthracnose in G. parviflora (Gasich, 1997).

Viruses: Tomato spotted mosaic wilt virus on G. parviflora plants growing in nearby fields of vegetable crops has been reported in Belgium (Gofflot and Verhoyen, 1990) and Argentina (Gracia and Feldman, 1989). Cucumber mosaic virus was isolated in G. parviflora plants near a celery and lettuce field in the USA (Bruckart and Lorbeer, 1976). G. parviflora was reported as a new host of Turnip mosaic virus in Zimbabwe. Myzus persicae, Brevicoryne brassicae and Aphis fabae transmitted the virus from infected to healthy cabbage plants (Chivasa et al., 2002). Tomato spotted wilt virus infection was detected in the Czech Republic where the main vector Frankliniella occidentalis was also present (Mertelik and Mokra, 1998). A virus disease of sunflower caused by Sunflower mosaic virus had a very narrow host range, infecting only one weed host, G parviflora (Nagaraju et al., 1997).

Mites: several mite species have been found on G. parviflora in the USA (Batra, 1979).

Insects: Agrotis ipsilon, a serious pest of maize, sorghum, soybean, cabbage and rape crops in Brazil, develops its first-instar larvae in G. parviflora plants (Link and Severo-Pedrolo, 1987). Other noctuids, such as Heliothis, Plutella and Pieris spp., feed on G. parviflora (Rai and Tripathi, 1985). Thrips tabaci, the vector of tomato spotted wilt tospovirus, is usually found in G. parviflora plants in tobacco fields of Poland (Wegorek and Lipa, 1979). The host plant for the larvae of Dioxyna bidentis or Paroxyna bidentis is G. parviflora in southern Norway (Greve, 2001). G. parviflora was reported as a supplementary or alternative food for Arion lusitianicus (Kozlowski and Kozlowska, 2000).

In an extensive survey in the USA, 122 insect species were found on G. parviflora plants, among them 22 crop pests, including three virus vectors (Batra, 1979). Orthezia insignis, a serious eucalyptus pest in India, may be found feeding on G. parviflora (Srikanth et al., 1988).

Nematodes: species of the genus Meloidogyne (arenaria, thamesi, hapla, javanica and schachtii) and Globodera rostochiensis, that produce serious root damage in Hungary, Brazil (Lordello et al., 1988) and the Philippines (Zorrilla and Davide, 1983), have been found in G. parviflora.

Bacteria: results indicated that G. parviflora can maintain Ralstonia solanacearum (race 3 biovar ) in the absence of potato as a source of infection in the following years (Barchend and Schmidt, 2002).

Parasitized aphids were observed on G. parviflora in Chile (Russo et al., 2000).

Means of Movement and Dispersal

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G. parviflora spreads by seeds. Seed viability is usually high (90%). One plant can set as many as 30,000 seeds (achenes), but it is common to find 5000-10,000 seeds/plant (Kissmann and Groth, 1993). Seed output and dry-matter yield increases with population density, although seed output is reduced at very high densities (Rai and Tripathi, 1983). Achenes can be dispersed by wind, animals, or water. They can also be dispersed by human activities, such as movement of soil or plants. In Finland, the most effective means of dispersal is believed to be seedlings inadvertently grown in nurseries or commercial greenhouses.

Pathway Causes

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CauseNotesLong DistanceLocalReferences
Crop productionAgricultural weed Yes Yes Damalas, 2008
Escape from confinement or garden escape Yes Yes Damalas, 2008
HorticultureWeed in gardens and yards Yes Yes Damalas, 2008
Medicinal useUsed in traditional African medicine Yes Yes Damalas, 2008
Nursery tradeWeed in nurseries Yes Yes Damalas, 2008
Ornamental purposesContaminant in common ornamental plants Yes Yes Damalas, 2008

Plant Trade

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Plant parts liable to carry the pest in trade/transportPest stagesBorne internallyBorne externallyVisibility of pest or symptoms
True seeds (inc. grain) seeds
Plant parts not known to carry the pest in trade/transport
Bark
Bulbs/Tubers/Corms/Rhizomes
Flowers/Inflorescences/Cones/Calyx
Fruits (inc. pods)
Growing medium accompanying plants
Leaves
Roots
Seedlings/Micropropagated plants
Stems (above ground)/Shoots/Trunks/Branches
Wood

Impact Summary

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CategoryImpact
Animal/plant collections Positive
Animal/plant products Negative
Biodiversity (generally) Positive
Crop production Negative
Environment (generally) Positive
Fisheries / aquaculture Negative
Forestry production Negative
Human health Positive
Livestock production Negative
Native fauna Negative
Native flora Negative
Rare/protected species Negative
Tourism Negative
Trade/international relations Negative
Transport/travel Negative

Economic Impact

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Kranz et al. (1982) found that the critical periods of weed competition for beans were at initial crop development and flowering/pod formation. Leaf development, plant height, pod number per plant, seed number per pod, seed production and harvest index were all reduced by weed competition; seed production was reduced by 51%. Other than G. parviflora, other weeds present were Cyperus rotundusBidens pilosa and Brachiaria plantaginea.

In a maize crop, in which the weed flora was dominated by G. parviflora (80% of the total weed dry matter), weed competition reduced growth, yield and harvest index of the maize crop (Hegewald, 1982). Grassy weeds including G. parviflora offered maximum competition to a maize crop reducing grain yield by 77.4%, followed by non-grassy weeds (44.2%) and sedges (38.4%) (Pandey et al., 2002).

Wheat crops with no weed control over the whole growing season gave significant lower yields than wheat crops with weed control from 13-55 days after sowing. G. parviflora populations ranged from 241-1907 plants/m². These weed populations reduced the number of ears of wheat/m², but showed little effect on grain weight or number (Thomas et al., 1978).

Competition for more than 30 days by G. parviflora, at a density of 241 plants/m² and Chenopodium album at 5 plants/m², significantly reduced wheat grain yields in a season where a frost occurred (Thomas and Schwerzel, 1979).

A 70% cover of G. parviflora and Amaranthus hybridus caused reduction in grain and shoot dry-matter yields of Eragrostis tef and wheat, which in turn promoted weed growth. The losses in E. tef could be partially recovered with nitrogen fertilizer (Pulschen, 1992).

Risk and Impact Factors

Top of page Invasiveness
  • Invasive in its native range
  • Proved invasive outside its native range
  • Highly adaptable to different environments
  • Highly mobile locally
  • Has high reproductive potential
  • Has propagules that can remain viable for more than one year
Impact outcomes
  • Altered trophic level
  • Damaged ecosystem services
  • Ecosystem change/ habitat alteration
  • Modification of nutrient regime
  • Monoculture formation
  • Negatively impacts agriculture
  • Negatively impacts animal health
  • Reduced native biodiversity
  • Threat to/ loss of native species
Impact mechanisms
  • Allelopathic
  • Competition - monopolizing resources
  • Competition - smothering
  • Pest and disease transmission
  • Rapid growth
Likelihood of entry/control
  • Highly likely to be transported internationally accidentally
  • Difficult to identify/detect as a commodity contaminant
  • Difficult/costly to control

Uses

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In areas of Latin America (Mexico, Colombia), young stems and leaves are eaten raw or cooked. The same is reported in Tanzania, where G. parviflora exists in abundance and it is consumed as a leafy vegetable. Plants can be dried, ground into a powder, and then used as a flavouring in soups. In Africa, the species is also reported to be used as a medicine for treating nettle stings by rubbing it on the skin. In Uganda, it is reported as a traditional herbal drug used for treating bleeding (Damalas, 2008). 

Uses List

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Human food and beverage

  • Emergency (famine) food
  • Flour/starch
  • Food additive
  • Spices and culinary herbs
  • Vegetable

Medicinal, pharmaceutical

  • Source of medicine/pharmaceutical
  • Traditional/folklore

Similarities to Other Species/Conditions

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G. parviflora is commonly confused with G. ciliata. The latter differs in being much more hairy, with many glandular hairs 0.5 mm or longer on the peduncles, whereas G. parviflora has only few, less than 0.5 mm long. Also G. ciliata has aristate (long-pointed) pappus-scales on the seeds; those of G. parviflora are not long pointed. G. ciliata may also be more shade-tolerant than G. parviflora (Rai and Tripathi, 1986b).

Prevention and Control

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Cultural Control

The critical period of competition between lettuce and G. parviflora, Bidens pilosa, Amaranthus hybridus and Raphanus raphanistrum, depends on transplanting date. For maximum crop production the crop must be kept weed free only during the first week after transplanting. If the lettuce crop is transplanted later the weed-free period must be extended to 2 weeks (García Blanco, 1983).

Increasing Stevia rebaudiana cv. BPP72 density, plus 0.08 mm black polyethylene sheeting as mulch, achieved significant reductions in G. parviflora populations (Baltazar et al., 1980).

Solarization with 0.11 mm transparent polyethylene sheeting is effective in reducing viability of G. parviflora seed; microwaves have been found to affect G. parviflora seed viability (Barker and Craker, 1991). It is possible that higher temperatures under the sheeting (41.5°C) as opposed to the control (35.2°C) caused lethal injuries in embryo tissues of the seed.

Mechanical control with pre-emergence harrowing achieves a degree of control in maize, peas, beans and other row crops.

Host-Plant Resistance

Among a total of seven varieties of Phaseolus vulgaris studied, differences were observed in ability to compete against G. parviflora (Senesac et al., 1979).

Biological Control

Vulgamycin, produced by a new strain of Streptomyces sp., demonstrates some control of G. parviflora (Babczinski et al., 1991). Although no pre-emergence applications of vulgamycin showed any control of G. parviflora, post-emergence applications resulted in good control of several weeds, including G. parviflora. Cotton, barley and maize showed 10% damage, whereas sunflowers demonstrated no tolerance to the compound.

Chemical Control

Chemical control may be achieved with isoproturon, bromoxynil, 2,4-D, MCPA and dicamba in winter and spring cereals.

Rimsulfuron, a sulfonylurea herbicide, gives adequate control of G. parviflora in maize and potatoes, as do atrazine and related herbicides in sorghum.

Urea derivatives are applied to cotton, celery, onion and carrot crops. Metribuzin has been successfully tested in tomatoes.

Imazaquin, fomesafen and acifluorfen are used for G. parviflora control in soybeans.

Desmetryn, nitrofen and chloroxuron are used for G. parviflora control in cabbage.

In flower crops (chrysanthemum, gerbera, gladiolus, freesia and carnation), oxadiazon and napropamide are used.

Chemical control of G. parviflora in orchards may be achieved with terbacil, simazine and diuron.

Prolonged herbicide application using metamitron resulted in development of resistance in G. parviflora (Schmidt, 1986).

 

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22/04/14 Updated by:

Julissa Rojas-Sandoval, Department of Botany-Smithsonian NMNH, Washington DC, USA

Pedro Acevedo-Rodríguez, Department of Botany-Smithsonian NMNH, Washington DC, USA

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