Code
ERISUGrowth form
Broadleaf
Biological cycle
Annual
Habitat
Terrestrial
synonym | Aster ambiguus E.H.L.Krause |
synonym | Baccharis ivifolia Blanco |
synonym | Conyza ×flahaultiana (Thell.) Sennen |
synonym | Conyza altissima Naudin ex Debeaux |
synonym | Conyza ambigua DC. |
synonym | Conyza bonariensis f. subleiotheca Cuatrec. |
synonym | Conyza bonariensis var. microcephala (Cabrera) Cabrera |
synonym | Conyza erigeroides DC. |
synonym | Conyza floribunda var. lanciniata Cabrera |
synonym | Conyza floribunda var. subleiotheca (Cuatrec.) J.B.Marshall |
synonym | Conyza gracilis Hoffmanns. & Link |
synonym | Conyza groegeri V.M.Badillo |
synonym | Conyza naudinii Bonnet |
synonym | Dimorphanthes ambigua (DC.) C.Presl |
synonym | Dimorphanthes floribunda Cass. |
synonym | Erigeron ×flahaultianus Thell. |
synonym | Erigeron ambiguus (DC.) Sch.Bip. |
synonym | Erigeron bonariensis var. microcephalus Cabrera |
synonym | Erigeron crispus subsp. naudinii (Bonnet) Bonnier |
synonym | Erigeron erigeron subsp. naudinii (Bonnet) Bonnier |
synonym | Erigeron musashensis Makino |
synonym | Erigeron naudinii (Bonnet) Bonnier |
synonym | Erigeron naudinii (Bonnet) Humbert |
synonym | Erigeron naudinii (Bonnet) P.Fourn. |
synonym | Erigeron sumatrensis Retz. |
synonym | Eschenbachia ambigua (DC.) Moris |
synonym | Pulicaria gracilis (Hoffmanns. & Link) Nyman, 1855 |
Afrikaans |
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Créole Maurice |
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Créole Réunion |
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English |
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French |
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Malagasy |
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Other |
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Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY_SA |
References |
China: Conyza sumatrenis flowers and fruits from May to October.
Mayotte: Conyza sumatrensis flowers from September to April and fruits from September to May.
Morocco: Conyza sumatrensis flowers in spring, autumn or all year round.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY_SA |
References |
Erigeron bonariensis | Erigeron canadensis | Conyza sumatrensis | |
plant height | 0,2 - 0,9 (2) m | 1,5 m | 2 m |
Leaves (size) | 7 to 15 cm | 2 to 9 cm | 3 to14 cm |
Leaves (color) | Intense green | Greenish | greyish |
Inflorescence | Inverted pyramidal panicle | pyramidal panicle | pyramidal panicle |
capitulum (form) | ovoid campanulate | cylindrical | ovoid |
capitulum (size) |
hight 6-7 mm
diam 8-10 mm
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hight 3 à 5 mm diam 2-3 mm |
hight 5 à 8 mm diam 4 mm |
capitulum (hairiness) | pubescent | glabrous (or sparse hair) | densely pubescent |
capitulum (color) | white - yellowish brown | white | cream reddish tawny |
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
China: Conyza sumatrensis is a common weed of grassland on solpes, open areas, roadsides and riverbanks, at altitudes of between 100 and 2,500 m.
Comoros: Conyza sumatrensis is a ruderal species which prefers open areas, especially in areas areas of low altitude up to 600 m altitude.
Madagascar: Species fairly widespread in the highlands and the wet eastern slope, usually on more or less sandy soil and alluvial or colluvial deposits.
Mauritius: A weed of crops, fallow and roadsides. It is not very common on the island.
Mayotte: C. sumatrensis is a species naturalized in all the secondarized environments of the hygrophilic and mesophilic regions of the island. It is very present in culture and in urban zone.
Morocco: Conyza sumatrensis is a fairly common naturalized exotic species. It is a ruderal species of anthropized environments, crops, wasteland and wadi beds, up to 1500 m altitude
New Caledonia: The species is growing in light and heat. It prefers very bright places, soils often dry, stony, gravelly, sandy, sandy-loamy, acid or neutral tendency.
Reunion: The species is demanding of light and heat. It prefers well-lit areas often dry, stony, gravelly, sandy, sandy loam, acidic or neutral. It is common in Reunion in wastelands and cultures, especially at medium altitude between 500 and 1500 m.
Seychelles: absent.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY_SA |
References |
Origin
Conyza sumatrensis Is a neophyte originating from subtropical America.
Worldwide distribution
Spread from there into the subtropcal and warm temperate areas of the world (South America, Asia, Europe, Africa and Oceania). Note that it is absent from the West Indies.
Attributions | dummy |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY_SA |
References |
Local harmfulness
Comoros: Conyza sumatrensis is a common weed of vegetable cultivations, sometimes present in the fields of cassava and banana.
French Guiana: The competitive power of this weed is low for crops in Guyana. It is punctually observed in slashed and burnt areas. Not very problematic.
Madagascar: This species infests slightly intensified food crops (minimum cultivation) and can be harmful for certain crops like beans associated or not with maize, cassava and groundnuts. It has become highly invasive in the Highlands and the Eastern regions.
Mauritius: uncommon weed in crops.
New Caledonia: It is infrequent in Caledonian pastures.
Reunion: It is a common weed present in 45% of the plots but remains scarce. Its recovery rarely reached more than 30%.
Seychelles: absent.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Global control
For weeding Advice for broadleaf annual weeds of irrigated rice and lowland in Africa, visit: http://portal.wiktrop.org/document/show/19
Local control
New Caledonia: Conyza sumatrensis is not an invasive species of pastures, but in some situations it may form with other minor weeds a procession of species with little or no palatability, the abundance of which contributes to the degradation of pastures and decreases the production of forage species. It is therefore advisable to prevent the germination and spread of this annual species as much as possible by maintaining a dense herbaceous cover. Manual removal of insulated individuals is often enough to get rid of them. If necessary, after rotary grinding, a targeted spray of herbicide can be carried out on isolated spots. We will therefore favor traditional active ingredients such as 2,4-D (see table of treatments) selective to grasses.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Herbarium pictures ReCOLNAT: https://explore.recolnat.org/search/botanique/simplequery=Erigeron%2520sumatrensis
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Root | Root |
Kingdom | Plantae |
Phylum | Tracheophyta |
Class | Magnoliopsida |
Order | Asterales |
Family | Asteraceae |
Genus | Conyza |
Species | Conyza sumatrensis (Retz.) E. Walker |