Chloris barbata (purpletop chloris)
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Chloris barbata Sw., 1797
Preferred Common Name
- purpletop chloris
Other Scientific Names
- Andropogon barbatus L., 1771, non L., 1759
- Chloris inflata Link, 1821
- Chloris longifolia Steud., 1854
- Chloris paraguayensis Steud., 1854
- Chloris refuscens Steud., 1854, non Lag., 1805
International Common Names
- English: peacock plumegrass; plush grass; purple top; swollen fingergrass
- Spanish: zacate borrego
Local Common Names
- Cuba: pata de gallina
- Indonesia: rumput jejarongan; suket cakar ayam
- Japan: murasaki-higeshiba
- Malaysia: kilen
- Philippines: banuko; korokorosan
- Sri Lanka: kondai pul; mayuru tana
- Thailand: yaa rangnok
- USA/Hawaii: mau'u lei
- CHRBA (Chloris barbata)
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Plantae
- Phylum: Spermatophyta
- Subphylum: Angiospermae
- Class: Monocotyledonae
- Order: Cyperales
- Family: Poaceae
- Genus: Chloris
- Species: Chloris barbata
Notes on Taxonomy and NomenclatureTop of page
C. barbata is based on Andropogon barbata which is an illegitimate name, being a later homonym of A. barbatus, the names being based on different plants. The epithet barbata is not, however, illegitimate in the genus Chloris and Swartz was perfectly in order in calling his plant C. barbata, there being no other epithet available. As the citation C. barbata is ambiguous, the Code permits us to forget that Linnaeus made the illegitimate combination. Thus, C. barbata is regarded as a new name dating from 1797 and should be cited without acknowledgement to Linnaeus (Bor, 1960; Cope, 1982). Chloris inflata, a name often applied to this species, is predated by C. barbata.
DescriptionTop of page
The leaf blades are flat and narrow, linear-lanceolate, 10-20 cm long (the upper ones shorter), 2-3 mm wide and usually bluish-green with rough edges. They often have long, scattered hairs on the upper surface, near the base. The sheaths are smooth and 2-6 cm long; usually less than half as long as the internodes. They are compressed, keeled and closely overlapping, with glabrous or bearded orifice. The ligule is 0.5-1.0 mm long, membraneous and fringed with short hairs.
Terminal, composed of a whorl of 5-15 digitate spikes which are densely clustered. The spikes are usually ascending, purple and 5-8 cm long with three-flowered spikelets (one fertile flower). These are purplish and densely overlapping, with three slender awns. The glumes are unequal, narrow, acute and membraneous except for a single green nerve. The first is 1-1.5 mm long and the second 2-2.5 mm long. There are almost always three florets which are often purple. The rachilla internode is 1 mm long. The lemmas are three-nerved. The first lemma is obovate, keeled and 2-2.5 mm long. It is sparsely to densely pilose on the margins and the keel. The awn is 5-10 mm long. The palea is 2-2.5 mm long and nearly as broad as the lemma with marginal keels. The apical rudiment is approximately 1 mm long and consists of two inflated, triangular-truncate, thin, glabrous, sterile lemmas, one within the other, each with an awn 3-5 mm long.
Chromosome number: 2n = 20.
C. barbata grain is pale brown, tapering at both ends and 1-2 mm long, enclosed within the persistent lemma and palea.
C. barbata is propagated by seed.
DistributionTop of page
Distribution TableTop of page
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.Last updated: 10 Feb 2022
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|Papua New Guinea||Present|
HabitatTop of page
In South-East Asia, it occurs in lowland ricefields, lawns, by roadsides and railway tracks and similar disturbed situations. It tends to be saline tolerant and is common in desert pans and littoral areas and on the fringes of salt meadows and mangrove swamps (Lazarides, 1980).
Host Plants and Other Plants AffectedTop of page
|Arachis hypogaea (groundnut)||Fabaceae||Main|
|Carica papaya (pawpaw)||Caricaceae||Main|
|Cocos nucifera (coconut)||Arecaceae||Other|
|Coffea arabica (arabica coffee)||Rubiaceae||Main|
|Macadamia ternifolia (Queensland nut)||Proteaceae||Main|
|Nicotiana tabacum (tobacco)||Solanaceae||Main|
|Oryza sativa (rice)||Poaceae||Main|
|Saccharum officinarum (sugarcane)||Poaceae||Main|
Biology and EcologyTop of page
C. barbata is a host of a number of rice insect pests and diseases, including the white-backed planthoppers, Sogatella furcifera (Vaidya and Kalode, 1982; Catindig et al., 1988, 1991) and Sogatodes pusanus [Tagosodes pusanus] (Catindig et al., 1989), the rice bug Leptocorisa oratorius (Rajapakse and Kulasekera, 1980), the rice earcutting caterpillar Mythimna separata (Catindig et al., 1991, 1994), the rice-feeding tiger moth Creatonotus gangis (Catindig et al., 1991, 1993), the cereal thrips Haplothrips ganglbaurei (Ananthakrishnan and Thangavelu, 1976), the rice whitefly Aleurocybotus indicus (Alam, 1989), and sheath blight Rhizoctonia solani [Thanatephorus cucumeris] (Kannaiyan and Prasad, 1979). It is also an ovipositional host of the rice leaffolder, Cnaphalocrocis medinalis (Barrion et al., 1991).
It is also the principal alternative host of the grass seed-feeding thrips, Chirothrips mexicanus, which infests the cultivated crop pearl millet, Pennisetum typhoides [Pennisetum glaucum] (Ananthakrishnan and Thirumalai, 1977).
ImpactTop of page
C. barbata is a common weed in sugarcane, tree crops (papayas, macadamia nuts, coffee) and lawns in Hawaii (R.K. Nishomoto, University of Hawaii, personal communication) and occurs in groundnuts in India (Rajan et al., 1981) and tobacco in the Philippines (Pancho and Obien, 1983) and Thailand (Suwanarak et al., 1986). It occurs infrequently in coconut plantations in the northern Marshall Islands (Taylor, 1950).
It has been reported as a weed of upland rice in India, Indonesia, Philippines, Sri Lanka, Thailand and Vietnam, of dry-seeded rice in India and Thailand, of wet-seeded rice (sprouted seeds sown on puddled soil) in Thailand, and of transplanted rice in India and the Philippines. It has also been reported as occurring in rice seedling nurseries in Thailand and in lowland rice in Indonesia (Moody, 1989).
Yield losses of up to 20% in sugarcane are likely with heavy infestations of C. barbata. On Oahu, Hawaii, C. barbata developed resistance to herbicides and eventually entire fields were infested with high populations of C. barbata up to 1.5 m tall. In some cases, where sugarcane growth was poor, infestations were so severe that the crop was ploughed under and the field replanted (LT Santo, Hawaiian Sugar Planters' Association, personal communication).
Fresh root extracts of C. barbata collected from South Arcot, Tamil Nadu, inhibited growth of ragi (Eleusine coracana) seeds (Jeyamurthy and Lakshmanachary, 1989).
C. barbata is grazed by stock when young but it soon becomes unpalatable and, thereafter, it is a pest (Whitney et al., 1939). According to Henty (1969), it is useless for grazing. The purplish, feathery-looking spikes are used in hat leis in Hawaii (Neal, 1965).
Similarities to Other Species/ConditionsTop of page
A similar species, C. virgata (feather fingergrass or feathertop Rhodes grass), differs in having white to yellowish-brown spikes and only two (rather than three) distinct awns (Whistler, 1994). C. gayana (Rhodes grass), a valuable fodder grass, is superficially similar but the spikes are yellow-brown rather than purple and the awns are much shorter, less than 1.5 times as long as the lemmas (Kleinschmidt and Johnson, 1977). Another weedy species, C. pilosa also has very short awns. C. prieurii has long awns, but there are 4-6 per spikelet. The annual C. pycnothrix has very distinctive short, blunt leaves.
Prevention and ControlTop of page
Due to the variable regulations around (de)registration of pesticides, your national list of registered pesticides or relevant authority should be consulted to determine which products are legally allowed for use in your country when considering chemical control. Pesticides should always be used in a lawful manner, consistent with the product's label.Cultural Control
Good cultural practices, including good tillage, use of vigorous cultivars and timing of water and fertilizer applications maximize sugarcane growth and canopy closure (Santo, 1989). Healthy growing sugarcane will grow above C. barbata and shade it out and yield losses will be slight, if any (LT Santo, Hawaiian Sugar Planters' Association, personal communication).
In Hawaii, pre-emergence herbicides are the primary method of controlling weeds in sugarcane, with post-emergence treatments as a back-up. Grass weeds, including C. barbata, are difficult to control with post-emergence herbicides without damaging the crop. Ametryn or diuron + atrazine account for 80% of the herbicides used. A pre-emergence application in irrigated fields gives control for 5-8 weeks. Terbacil or hexazinone may be added to control C. barbata. Metsulfuron also gives good control of C. barbata. Ametryn or diuron, atrazine and 2,4-DB are used with dalapon or hexazinone for perennial grasses. Glyphosate is spot-applied to tall grass stands, with 2,4-D if broadleaved weeds are present (Santo, 1989). C. barbata developed resistance to ametryn and diuron. However, it is susceptible to pre-emergence applications of trifluralin or pendimethalin and is no longer a problem in sugarcane fields in Hawaii (LT Santo, Hawaiian Sugar Planters' Association, personal communication). Barnes and Chandapillai (1972) suggest the use of methylarsonic acid plus 2,4-D.
Glyphosate is used to control C. barbata in tree crops in Hawaii and spot applications of glyphosate or glufosinate are used in lawns (RK Nishimoto, University of Hawaii, personal communication).
In Andhra Pradesh, India, fluchloralin effectively controlled C. barbata and other narrow-leaved weeds in irrigated groundnuts (Rajan et al., 1981).
In tobacco in Thailand, clopomydim, fenoxaprop-ethyl, haloxyfop-methyl and fluazifop-butyl gave good control of the narrow-leaved weeds, including C. barbata, but could not control all of the broadleaved weeds. Fluazifop-butyl + bifenox, haloxyfop-methyl + dimethazone [withdrawn] and fenoxaprop-ethyl + dimethazone [withdrawn] controlled all the annual weeds for longer than 4 weeks and did not damage the crop (Suwanarak et al., 1986).
ReferencesTop of page
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