Dactylis glomerata (cocksfoot)
- Summary of Invasiveness
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Plant Type
- Distribution Table
- History of Introduction and Spread
- Risk of Introduction
- Habitat List
- Hosts/Species Affected
- Biology and Ecology
- Natural enemies
- Notes on Natural Enemies
- Means of Movement and Dispersal
- Pathway Causes
- Pathway Vectors
- Impact Summary
- Economic Impact
- Environmental Impact
- Social Impact
- Risk and Impact Factors
- Uses List
- Similarities to Other Species/Conditions
- Prevention and Control
- Distribution Maps
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Dactylis glomerata L.
Preferred Common Name
Other Scientific Names
- Bromus cylindraceus (Brot.) Brot.
- Bromus glomeratus (L.) Scop.
- Dactylis abbreviata Bernh. ex Link
- Dactylis altaica Besser
- Dactylis aschersoniana Graebn.
- Dactylis capitellata Link
- Dactylis ciliata (Peterm.) Opiz
- Dactylis glaucescens Willd.
- Dactylis heterophylla Opiz ex Domin
- Dactylis polygama Horv.
- Festuca glomerata (L.) All.
- Koeleria dactylis Chaub.
- Limnetis glomerata (L.) Eaton
- Phalaris glomerata (L.) Gueldenst.
International Common Names
- English: cock's-foot; orchard grass; orchardgrass
- Spanish: dactilo; dactilo aglomerado; pasto orchoro; pasto ovillo
- French: dactyle; dactyle agglomere; dactyle pelotonne
- Portuguese: panasco
Local Common Names
- : barnyard grass; cocksfoot grass; cockspur
- : dactyle aggloméré; dactyle pelotonné; gramen pelotonné
- : jopillo
- : ya mao
- Germany: Gemeines Knaeuelgras; Gemeines Knaulgras; Knaulgras; Wiesen- Knaeuelgras
- Italy: dattile
- Portugal: dactilo; panasco
- Sweden: hundaexing; hundäxing; lundäxing
- DACGL (Dactylis glomerata)
Summary of InvasivenessTop of page
D. glomerata is a perennial grass considered a Eurasian native, but that has been introduced to many temperate countries around the world as a valuable pasture species, has become naturalized in many, has often spread or been spread widely within those countries, and has become an aggressive and persistent low-growing grass in many places. It has been described by Cal-IPC (2015) as an aggressive perennial grass that grows in any kind of soil, is drought resistant and can over-run some grasslands. They add that this species ‘is a desirable pasture grass but has escaped cultivation in many natural areas throughout the United States.’
Weeds of Australia (2015) reported that the species is ‘regarded as an environmental weed in Victoria, Tasmania, ACT and New South Wales. It has been grown as a pasture grass but has also spread into disturbed sites and natural plant communities. It is invasive in heathlands, open woodlands, forests, riparian habitats, freshwater wetlands and coastal environs, where it forms dense swards that suppress native grasses and forbs'. Muyt (2001) says that D. glomerata plants impede the growth and regeneration of indigenous ground flora, with smaller species the most susceptible to the competition.
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Plantae
- Phylum: Spermatophyta
- Subphylum: Angiospermae
- Class: Monocotyledonae
- Order: Cyperales
- Family: Poaceae
- Genus: Dactylis
- Species: Dactylis glomerata
Notes on Taxonomy and NomenclatureTop of page
Although listing several subspecies and varieties, ITIS (2015) says that only two subspecies of D. glomerata – ssp. glomerata and ssp. lobata (Drejer) H. Lindb. - have been accepted. Both The Plant List (2013) and USDA-ARS (2015), however, accept many subspecies – besides the two mentioned they include: ssp. aschersoniana (Graebn.) Thell.; ssp. himalayensis Domin; ssp. hispanica (Roth) Nyman; ssp. juncinella (Bory ex Boiss.) Stebbins & D.Zohary; ssp. lobata (Drejer) H. Lindb.; ssp. lusitanica Stebbins & D. Zohary; ssp. reichenbachii (Hausm. ex Dalla Torre & Sart.) Stebbins & D. Zohary; ssp. smithii (Link) Stebbins & D. Zohary; and ssp. woronowii (Ovcz.) Stebbins & D. Zohary.
C. E. Hubbard (1984), quoted by Beddows (1959) said that at least 200 names had been applied to taxa under D. glomerata (sensu lato) scattered through European botanical literature. There is clearly a wide diversity of forms within the species, with some being erect and others spreading and prostrate, and a wide variety of leaf colours. Some such types have been used as ornamentals (Beddows, 1959); some having yellow or golden leaves and others being variegated.
DescriptionTop of page
Perennial, tufted grass with flowering stalks erect, or kneed, 15–140 cm long. Plants have an extensive fibrous root system but no stolons and rarely have short rhizomes. Leaf sheaths keeled, ligule membranous. Leaf blades hairless, flat, folded among the mid-line, 10–45 cm long, 2–14 mm wide.
Inflorescence distinctive, bearing a fanciful resemblance to a cock’s foot. The flower head is 7-20 cm long, one-sided, erect, with the branches close together and spike-like and the lowest branch well below the others, and all the branches ending in several tight clusters of spikelets.
The spikelets are solitary, of 2–5 fertile florets, and are oblong or wedge-shaped, laterally compressed, 5–9 mm long; breaking up at maturity below each fertile floret. The glumes are dissimilar, shorter than the spikelet. The lower glume is lance-shaped, ¾ the length of the upper glume, membranous, 1-keeled, 1-veined. Lower glume ovate with an acute apex, 1-keeled, 3-veined. The lemma tapers gradually to a point, with one awn, 0.5–1.5 mm long overall. The caryopsis is tightly enclosed by the lemma and palea.
Plant TypeTop of page Grass / sedge
DistributionTop of page
D. glomerata was described by Domin (1943, quoted in Beddows, 1959) as ‘almost cosmopolitan’, since it has spread or been carried to every continent, often because of its role in seed mixtures. Beddows (1959) points out that it was common throughout Europe by 1769, before its value as a pasture grass had been acknowledged. The species occurs widely in the northern hemisphere north of latitude 30-35°N, and its distribution corresponds to 10°C and 27°C July isotherms (Beddows, 1959). It is generally reported as being native to Europe, Asia and North Africa, and introduced to the Americas, Australia and New Zealand.
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.
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|Bhutan||Present only in captivity/cultivation||Native||USDA-ARS, 2015|
|China||Present||Native||Flora of China Editorial Committee, 2015|
|-Gansu||Present||Native||Flora of China Editorial Committee, 2015|
|-Guizhou||Present||Native||Flora of China Editorial Committee, 2015|
|-Hebei||Present only in captivity/cultivation||Native||Flora of China Editorial Committee, 2015|
|-Henan||Present||Native||Flora of China Editorial Committee, 2015|
|-Hubei||Present||Native||Flora of China Editorial Committee, 2015|
|-Jiangsu||Present only in captivity/cultivation||Native||Flora of China Editorial Committee, 2015|
|-Ningxia||Present||Native||Flora of China Editorial Committee, 2015|
|-Shaanxi||Present||Native||Flora of China Editorial Committee, 2015|
|-Shandong||Present only in captivity/cultivation||Native||Flora of China Editorial Committee, 2015|
|-Sichuan||Present||Native||Flora of China Editorial Committee, 2015|
|-Xinjiang||Present||Native||Flora of China Editorial Committee, 2015|
|-Yunnan||Present||Native||Flora of China Editorial Committee, 2015|
|-Zhejiang||Present||Native||Flora of China Editorial Committee, 2015|
|Georgia (Republic of)||Present||Native||USDA-ARS, 2015|
|India||Present||Native||USDA-ARS, 2015||Northern parts|
|Nepal||Present||Native||Flora of China Editorial Committee, 2015|
|Pakistan||Present||Native||Flora of Pakistan, 2015||Punjab, N.W.F.P., Gilgit & Kashmir, 1700-4000 m|
|Taiwan||Present||Native||Flora of China Editorial Committee, 2015|
|Kenya||Present||Heuze and Tran, 2015||Found above 2350 m|
|Réunion||Present||Introduced||PIER, 2015; Weeds of Australia, 2015|
|South Africa||Present||Introduced||USDA-ARS, 2015|
|Tanzania||Localised||Introduced||Clayton, 1970||Roadsides, Usambara mountains, 2000-2300m|
|Canada||Present||Present based on regional distribution.|
|-British Columbia||Present||Introduced||USDA-NRCS, 2015|
|-New Brunswick||Present||Introduced||USDA-NRCS, 2015|
|-Newfoundland and Labrador||Present||Introduced||USDA-NRCS, 2015|
|-Nova Scotia||Present||Introduced||USDA-NRCS, 2015|
|-Prince Edward Island||Present||Introduced||USDA-NRCS, 2015|
|-Yukon Territory||Present||Introduced||USDA-NRCS, 2015|
|Saint Pierre and Miquelon||Present||Introduced||USDA-NRCS, 2015|
|USA||Present||Present based on regional distribution.|
|-California||Present only in captivity/cultivation||Introduced||USDA-ARS, 2015|
|-District of Columbia||Present||Introduced||USDA-NRCS, 2015|
|-Hawaii||Present||Introduced||PIER, 2015; USDA-NRCS, 2015|
|-New Hampshire||Present||Introduced||USDA-NRCS, 2015|
|-New Jersey||Present||Introduced||USDA-NRCS, 2015|
|-New Mexico||Present||Introduced||USDA-NRCS, 2015|
|-New York||Present||Introduced||USDA-NRCS, 2015|
|-North Carolina||Present||Introduced||USDA-NRCS, 2015|
|-North Dakota||Present||Introduced||USDA-NRCS, 2015|
|-Rhode Island||Present||Introduced||USDA-NRCS, 2015|
|-South Carolina||Present||Introduced||USDA-NRCS, 2015|
|-South Dakota||Present||Introduced||USDA-NRCS, 2015|
|-Utah||Present only in captivity/cultivation||Introduced||USDA-ARS, 2015|
|-Virginia||Present||Kuhn et al., 2013; USDA-NRCS, 2015|
|-West Virginia||Present||Introduced||USDA-NRCS, 2015|
Central America and Caribbean
|Costa Rica||Present||Introduced||USDA-ARS, 2015|
|Puerto Rico||Present||Introduced||USDA-NRCS, 2015|
|United States Virgin Islands||Present||Introduced||USDA-NRCS, 2015|
|Chile||Present||Introduced||Invasive||PIER, 2015||Invasive in Juan Fernandez Islands and continental Chile|
|Czech Republic||Present||Native||USDA-ARS, 2015|
|Russian Federation||Present||Native||USDA-ARS, 2015|
|-Central Russia||Present||Native||USDA-ARS, 2015|
|-Eastern Siberia||Present||Native||USDA-ARS, 2015; USDA-ARS, 2015|
|-Northern Russia||Present||Native||USDA-ARS, 2015|
|-Southern Russia||Present||Native||USDA-ARS, 2015|
|-Western Siberia||Present||Native||USDA-ARS, 2015|
|American Samoa||Present||Introduced||USDA-NRCS, 2015|
|-Lord Howe Is.||Present||Introduced||Invasive||PIER, 2015|
|-New South Wales||Widespread||Introduced||CHAH, 2015|
|-South Australia||Present||Introduced||CHAH, 2015|
|-Western Australia||Present||Introduced||CHAH, 2015|
|Johnston Island||Present||Native||USDA-ARS, 2015|
|Marshall Islands||Present||Introduced||USDA-NRCS, 2015|
|Micronesia, Federated states of||Present||Introduced||USDA-NRCS, 2015|
|New Zealand||Present||Introduced||USDA-ARS, 2015|
|-Kermadec Islands||Present||Introduced||Invasive||PIER, 2015|
|Norfolk Island||Present||Introduced||Invasive||PIER, 2015|
|Northern Mariana Islands||Present||Introduced||USDA-NRCS, 2015|
History of Introduction and SpreadTop of page
Beddows (1959) expressed surprise that although this species was known to be common in many meadows and pastures in southern England in the 1700s, farmers did not seem to have collected and increased the species for agriculture in the same way as with perennial ryegrass (Lolium perenne) in the 1600s. In a reversal of the usual pattern of spread, Beddows speculated that perhaps agricultural usage came about as a consequence of seed received from the North American colonies as the result of the activities of the London Society of Arts.
D. glomerata was introduced to Assam as a fodder plant in 1934 and Beddows (1959) speculated that it may similarly have been introduced elsewhere in India and China as a valuable fodder species. The species was carried to North America in 1760 (Sullivan, 1992) and to other former British colonies in the early 1800s.
IntroductionsTop of page
|Introduced to||Introduced from||Year||Reason||Introduced by||Established in wild through||References||Notes|
|Natural reproduction||Continuous restocking|
|Australia||UK||Crop production (pathway cause)||Yes||CHAH (2015); Council of Heads of Australasian Herbaria (2015)|
|New Zealand||UK||Crop production (pathway cause)||Yes||THOMSON (1922)|
|USA||1760||Yes||Sullivan (1992); Thomson (1922)|
Risk of IntroductionTop of page
D. glomerata has probably been taken deliberately to most countries that have suitable climates and it may yet be introduced to the few other countries in which it could grow but to which it has not yet been introduced.
HabitatTop of page
The habitat of D. glomerata in Britain is described by Beddows (1959) as widespread in hedgerows, meadows, pastures and rough grassland throughout the lowlands. Beddows also says that it tolerates (in Britain) a wide range of climatic conditions though it is sensitive to extreme conditions of temperature, precipitation and wind. It will not tolerate very wet conditions and is most often seen where shelter is present, such as close to hedges. In Australia, it is found in heathlands, open woodlands, forests, riparian habitats, freshwater wetlands and coastal environs (Weeds of Australia, 2015).
Habitat ListTop of page
|Cultivated / agricultural land||Secondary/tolerated habitat||Natural|
|Managed forests, plantations and orchards||Secondary/tolerated habitat||Natural|
|Managed grasslands (grazing systems)||Principal habitat||Natural|
|Managed grasslands (grazing systems)||Principal habitat||Productive/non-natural|
|Rail / roadsides||Secondary/tolerated habitat||Natural|
|Natural grasslands||Principal habitat||Natural|
Hosts/Species AffectedTop of page
D. glomerata can be a nuisance in fine turf but can eventually be eliminated by close mowing (Hannaway et al., 2004). CAL-IPC (2015) mentions that in ‘infrequent circumstances’ it displaces native perennial grasses, but also says it is not usually a problem and seldom occurs in high densities in California. In Australia, Weeds of Australia (2015) describe the species as ‘invasive in heathlands, open woodlands, forests, riparian habitats, freshwater wetlands and coastal environs, where it forms dense swards that suppress native grasses and forbs.’
Biology and EcologyTop of page
D. glomerata has been classified on the basis of its chromosome number and area of origin, but these distinctions have not necessarily been formally accepted as subspecies or varieties (ITIS, 2015). The commonest chromosome numbers are 2n=14 or 2n=28, but there are also minor occurrences of triploid and hexaploid forms. Lolicato and Rumball (1994) explained that diploid and tetraploid plants from the same geographic area show similarities in appearance but these groups will not generally interbreed. The tetraploids probably arose from the diploids by chromosome doubling. Borrill (1978) and Lumaret (1988) (both cited in Lolicato and Rumball, 1994) further divided forms in these two groups into a Eurasian or northern group and a Mediterranean or southern group. The Eurasian group contains large, broad-leaved, vigorous, winter-dormant plants growing mainly in areas with cold winter temperatures. The Mediterranean group includes relatively small, narrow-leaved, summer –dormant plants that grow mainly in areas with summer drought (Lolicato and Rumball, 1994). Many intermediate forms show varying degrees of typical Eurasian or Mediterranean characteristics.
Last et al. (2013) tested the ploidy levels of 50 natural and semi-natural populations of D. glomerata from Bulgaria, Norway and Switzerland. The plants examined were all tetraploid and showed a high level of genetic diversity, although within an individual population genetic distances were low as is typical of self-incompatible and wind-pollinated grasses.
Although individual tussocks of D. glomerata can become quite large, the main method of reproduction is by seed. Seed distribution relies mainly on stiff winds and its transport by birds, animals and man. Beddows (1959) suggests that water dispersal is unlikely.
Before flower shoot initiation can take place, plants must be subjected to a period of cold and then receive a photoperiod of at least 12 hours (Beddows, 1959). In Britain, Beddows reported that flowering may begin towards the end of May, is more general in June and may continue into July. Sporadic flowering can continue through autumn and even into winter. Although cross-fertilisation is usual, self fertilisation is possible in some plants: caryopses from outcrosses showed about 10% higher viability than those from inbreeding.
In the USA, most commercial D. glomerata seed is produced in the Willamette Valley of Oregon, with seed yields of 500-1700 kg/ha (Hannaway et al., 2004). In New Zealand the grass seed industry began with the harvest of D. glomerata on Banks Peninsula in 1851 but this area ceased to produce cocksfoot seed in the 1930s when disease attacked the crop and cheaper machine harvesting was developed elsewhere (Rolston, 2006).
Physiology and Phenology
D. glomerata is a cool season grass with C3 physiology.
Optimum temperature for germination seems to require a night temperature of 22o for 18 hours and a day temperature of 30oC (Beddows, 1959). Very few seeds buried in the soil survive for any length of time. However, seeds stored dry in the laboratory began to lose viability after 4 years and by 12 years were all dead.
D. glomerata establishes more slowly than perennial ryegrass (Hannaway et al., 2004), partly because of its development of a more extensive root system. The species is well-suited to early spring production except in very wet pastures. Leafy shoots are produced throughout the year, with the most active growth in April and May and again in July (in Britain) (Beddows, 1959).
Individual plants of D. glomerata have been known to live for 11 years and were still vigorous before they were ploughed in (Beddows, 1959). The same author suggests that individual shoots are probably annual rather than biennial or perennial since they die back after flowering. He further comments that if flowering is prevented by constant grazing plants may survive to become ‘old’.
The seeds do not appear to survive for long in the soil (Beddows, 1959).
Population Size and Structure
D. glomerata plants in undisturbed environments are mostly solitary but can be sufficiently numerous and close enough to appear contiguous (Beddows, 1959).
D. glomerata in its native Britain is associated with a wide variety of species with the most commonly associated grass species being Anthoxanthum odoratum, Holcus lanatus and Cynosurus cristatus, and Arrhenatherum elatius in lightly grazed or ungrazed areas such as hedgerows and meadows (Beddows, 1959).
Sullivan (1992) reports that an Oregon white oak (Quercus garryana)/D. glomerata vegetation type has been described in Redwood National Park, California.
Sullivan (1992) says that, at least in North America, D. glomerata is best adapted to well-drained, rich or moderately fertile soils with an adequate water regime (30 cm or more rainfall a year) and temperatures that are not extreme. Best growth is at about 21°C. The species is shade tolerant and does well at high elevations in the western USA and Canada (1500 to 1900 m). In Kashmir and western Tibet it grows in forest and open grassland at elevations of 1800-3600m, in France it ascends to 2100m, and in North Africa to 2400m (Beddows, 1959).
D. glomerata grows best in soils with a pH of between 6 and 7, but is found over a range of 5.5 to 8.0 (Spurway, 1941, quoted in Beddows, 1959). Beddows also reports that the species is often referred to as a ‘gross feeder’, since it responds well to nitrogenous fertilisers. However, as Lolicato and Rumball (1994) point out, D. glomerata persists better than perennial ryegrass (Lolium perenne) under low fertility conditions.
ClimateTop of page
|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|
|Df - Continental climate, wet all year||Preferred||Continental climate, wet all year (Warm average temp. > 10°C, coldest month < 0°C, wet all year)|
|Ds - Continental climate with dry summer||Preferred||Continental climate with dry summer (Warm average temp. > 10°C, coldest month < 0°C, dry summers)|
Natural enemiesTop of page
|Natural enemy||Type||Life stages||Specificity||References||Biological control in||Biological control on|
Notes on Natural EnemiesTop of page
Beddows (1959) lists a number of species of insects that have been found feeding on D. glomerata in Britain, most of which also attack other grass species although a few are apparently confined to this species. The same author lists a number of fungal diseases that affect the plants, some being more serious than others. The bacterial disease Rathayibacter rathayi (formerly Corynebacterium rathayi), had long been known in Europe and has been found in various places in England and Wales. Virus diseases have also been identified on the species. Beddows (1959) also mentioned that slugs, snails, woodlice (several species) and field mice (several species) can all damage the plants.
In North America, Hannaway et al. (2004) identify three diseases having major economic impact on forage production in the Pacific Northwest of the United States: stripe rust (Puccinia striiformis), leaf scald (Rhynchosporium orthosporum) and orchardgrass mottle virus. They say that these diseases cause reduced forage yield and quality but are not harmful to livestock except for respiratory sensitivity in horses. In seed production, choke disease (caused by Epichloe typhina) reduces stand longevity and prevents seed production on infected tillers. Hannaway et al. (2004) also report that D. glomerata does not, in North America, have any serious insect problems although more than 30 species have been found on stands of the species. Slugs (Agriolimax reticulatus) can destroy young plants. Although barley root-knot nematode (Meloidogyne naasi) has been reported on D. glomerata no serious problems have been reported (Hannaway et al., 2004).
In New Zealand, Lolicato and Rumball (1994) reported that rust and grass grub (Costelytra zealandica) can sometimes cause problems with this species.
Means of Movement and DispersalTop of page
The seeds of D. glomerata are spread locally by the wind, but more widespread distribution of this species has depended almost entirely on the activities of people. Beddows (1959) suggested that seeds would not be likely to pass through the digestive system of cattle.
Besides the deliberate introduction of D. glomerata to many countries as a forage species, accidental introduction has also been the result in earlier times of hay and straw carried with livestock to distant countries, as well as the use of plants as packing materials or stuffing for mattresses.
D. glomerata has been carried by migrants many new countries where it has established, naturalized and spread widely.
Pathway CausesTop of page
Pathway VectorsTop of page
Impact SummaryTop of page
|Environment (generally)||Positive and negative|
Economic ImpactTop of page
D. glomerata has been widely adopted as a very valuable pasture grass in many temperate countries. Its negative impacts seem to be relatively small (CAL-IPC, 2015).
Environmental ImpactTop of page
In Australia D. glomerata is regarded as an environmental weed in Victoria, Tasmania, Australian Capital Territories and New South Wales, where it has spread into disturbed sites and natural plant communities (Weeds of Australia, 2015). It forms dense swards that suppress native grasses and forbs.
In California (CAL-IPC, 2015) D. glomerata has invaded oak woodlands, serpentine habitats and is an emerging threat in coastal prairie grasslands, but it is apparently not usually a problem.
Impact on Biodiversity
Sullivan (1992) says that in North America, D. glomerata is ‘moderately nutritious and highly palatable to deer, elk, bighorn sheep, sheep, and cattle as well as to domestic livestock. She continues, ‘In areas disturbed by fire where orchardgrass has been seeded (usually in a mixture with other grasses and forbs) wildlife use increases over nonseeded areas and nonburned areas’. Furthermore, where this species is dominant in forest openings, rufus hummingbirds (Selasphorus rufus), pine siskins (Spinuspinus), slate-colored juncos (Juncohyemalis), American robins (Turdusmigratorius), valley pocket gophers (Thomomysbottae), siskins (Spinus spp.), desert harvest mice (Reithrodontomysmegalotis megalotis), deer mice (Peromyscus spp.), Mexican voles (Microtusmexicanus) and white –tailed deer (Odocoileusvirginianus) are found (Hudson and Johnson, 1964).
Social ImpactTop of page
According to PFAF (2015) this species is reported to be oestrogenic. However, the social impacts of D. glomerata have probably been more positive than negative. PFAF also points out that this species is considered a common cause of hayfever.
Risk and Impact FactorsTop of page Invasiveness
- Invasive in its native range
- Proved invasive outside its native range
- Has a broad native range
- Abundant in its native range
- Highly adaptable to different environments
- Pioneering in disturbed areas
- Tolerant of shade
- Benefits from human association (i.e. it is a human commensal)
- Fast growing
- Has high reproductive potential
- Has propagules that can remain viable for more than one year
- Competition - monopolizing resources
- Highly likely to be transported internationally deliberately
- Difficult to identify/detect as a commodity contaminant
UsesTop of page
D. glomerata is widely used as a pasture grass and also to improve forage production on rangelands (Sullivan, 1992). According to Stewart and Ellison, 2011 (quoted in Last, 2013), it is the fourth most important forage grass in the world, due to its high productivity and its disease resistance under varying climatic conditions. Hannaway et al. (2004) report that in Oregon properly fertilised, well-managed stands of D. glomerata are capable of producing high-quality forage, with high levels of palatability, digestible energy, protein and minerals. In Oregon, which produces most of the seed of this species for North America, in 2002-2003 seed production averaged 913 kg/ha over 7663 ha, and its retail value was estimated at about $15 million. The same authors estimated that the value of the species to livestock in the 12 northeastern states could have been over $37.5 million.
Many reports have been written on various aspects of the production and nutritional value of this species to many different animals (including cattle, sheep, rabbits, pigs, horses, donkeys and poultry) (Heuze and Tan, 2015).
Lolicato and Rumball (1994) point out that the older cultivars of the species used in Australia and New Zealand originated in northern Europe and were suited to cooler, wetter areas. However, since the 1950s greater interest has been shown in cultivars with better winter growth, a characteristic of Mediterranean accessions (mostly of the ssp. hispanica). Selections from these accessions have lower crowns and a more prostrate habit which makes them more tolerant of hard grazing.
The plant is a folk remedy for treating tumours, kidney and bladder ailments (PFAF, 2015).
Quattrocchi (2006, quoted in Heuze and Tran, 2015) says this species provides excellent ground cover and can be used in rehabilitation programmes such as soil erosion control on cut-over forest land or on slopes, and rehabilitation of sites disturbed by mining.
According to Sullivan (1992)D. glomerata is ‘widely recommended and used for a variety of rehabilitation applications.’ The species is used for reducing erosion after devegetation by fire and for rehabilitation of overgrazed lands. It is also used in areas that have been logged and burned to provide a rapid vegetation cover to help soil stabilisation and provide forage for cattle or wildlife or both. Where sites have been disturbed by mining the species is used for rehabilitation, especially in sites that are relatively cool and moist.
Uses ListTop of page
Animal feed, fodder, forage
- Fodder/animal feed
- Erosion control or dune stabilization
- Land reclamation
- Soil conservation
Similarities to Other Species/ConditionsTop of page
D. glomerata has a very distinctive flower head, unlikely to be confused with other grass species.
Prevention and ControlTop of page
Beddows (1959) says that D. glomerata can easily be controlled by ploughing, and that it does not survive heavy trampling by livestock. Muyt (2001) says that plants can be dug out but that the crown must be removed to prevent regrowth. Where plants are in seed he suggests cutting and bagging the stems before removing the rest of the plant. Muyt (2001) also says that stands can be slashed regularly during the main growing season to limit seed production. When a weed in turfgrass it can eventually be eliminated by close mowing (Hathaway et al., 2004).
Although a few insect species seem to be confined to D. glomerata (Beddows, 1959) there has never been any interest in using any of these for biological control: the species is so-long established and so valuable in many places that this would be impractical.
Muyt (2001) says that plants can be treated with non-selective herbicides like glyphosate or grass-selective herbicides like fluazifop-butyl, but follow-up treatment is needed to control seedlings and surviving plants.
ReferencesTop of page
Borril M, 1978. Evolution and genetic resources in cocksfoot. In: Annual Report of the Welsh Plant Breeding Station. 190-209.
CAL-IPC, 2015. Dactylis glomerata (orchardgrass). California Invasive Plants Council. http://www.cal-ipc.org/ip/management/plant_profiles/Dactylis_glomerata.php
CHAH (Council of Heads of Australasian Herbaria), 2015. Australia's virtual herbarium. Australia: Council of Heads of Australasian Herbaria. http://avh.ala.org.au
Flora of China Editorial Committee, 2015. Flora of China. St. Louis, Missouri and Cambridge, Massachusetts, USA: Missouri Botanical Garden and Harvard University Herbaria. http://www.efloras.org/flora_page.aspx?flora_id=2
Flora of Pakistan, 2015. Flora of Pakistan/Pakistan Plant Database (PPD). Tropicos website. USA: St. Louis, Missouri and Cambridge, Massachusetts. http://www.tropicos.org/Project/Pakistan
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29/04/15 Original text by:
Ian Popay, Landcare Research, Private Bag 3127, Hamilton 3240, New Zealand
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