Urochloa brizantha x U. ruziziensis
Urochloa ruziziensis x U. decumbens x U. brizantha
Family: Poaceae (alt. Gramineae) subfamily: Panicoideae tribe: Paniceae.
brachi hybrid, brachiaria hybrid .
Cv. Mulato (B. brizantha x B. ruziziensis).
Perennial with a semi-erect growth habit, spreading by rooting from lower culm nodes. Leaf blade is linear-triangular in shape, broad, dark green, both abaxial and adaxial surfaces densely covered with long hairs. Leaf sheath is densely pubescent. Ligule membranociliate, short. Stigmas pink. Inflorescence is a panicle 12 cm long, with 4–8 racemes about 6 cm long, and spikelets arranged in two rows on each raceme .
There are currently two Brachiaria spp. hybrids developed as forages and further combinations of species may be developed as hybrids in the future.
Does not occur naturally.
Artificial hybrids suited to the tropics to 1,800 m asl and the subtropics at low altitudes.
Permanent pasture for grazing and cutting.
Well-drained soils of medium to high fertility with pH 4.5–8.0 but can grow in less infertile acid soils with high Al. Will respond strongly to added N on deficient soils.
Adapted to annual rainfall of 1,000–3,500 mm with good production in the dry season.
Tropics to 1,800 m asl and warm subtropics.
Likely to be similar to B. brizantha, having intermediate shade tolerance compared with other tropical grasses.
No information available.
Tolerates intensive grazing at high stocking rates but benefits from a rest period.
Burning is not recommended, but 'Mulato' will probably recover from an occasional fire.
Guidelines for the establishment and management of sown pastures.
Cv. Mulato can be planted from seed planted into a well-prepared seedbed at 4–6 kg/ha seed. In common with B. brizantha, freshly harvested ‘Mulato’ seed will remain dormant for several months, so that seed must be stored or acid-scarified prior to planting. Can be planted vegetatively from stolon cuttings. Establishes rapidly, achieving 85% ground cover at 2 months after seeding at 5 sites in Honduras. Can be lightly grazed after 3–4 months.
Responds well to additional nitrogen fertiliser.
Compatibility (with other species)
Will combine with aggressive creeping legumes.
Legumes: Arachis pintoi .
Pests and diseases
Cv. Mulato has partial resistance to spittlebugs. In the ongoing breeding program at CIAT, a group of hybrids has been identified with high levels of antibiosis resistance to spittlebugs Aeneolamia varia, A. reducta, and Zulia carbonaria, whilst another group of hybrids showed field resistance to Z. pubescens and Mahanarva trifissa.
Ability to spread
Spreads rapidly by rooting from lower culm nodes.
Likely to be similar to B. brizantha, having potential to colonise disturbed areas.
Cv. Mulato has excellent nutritive value. For 90 day and 168 day regrowth in Colombia, CP was 13.1% and 10.6%, respectively, and IVDMD 70.0% and 70.6%, respectively.
Cv. Mulato is reported to be highly palatable to grazing ruminants.
None reported, but may cause skin photosensitization .
Individual cattle LWGs of up to 0.9 kg/head/day were reported following short periods of grazing in Honduras.
The breeding program at CIAT, Colombia, is attempting to increase resistance to spittlebugs, and improve nutritive quality and DM production of Brachiaria species through selection and interspecific hybridisation. The program has made use of a cross-compatible, sexual tetraploid biotype of B. ruziziensis combined with tetraploid apomicts of B. brizantha to produce the hybrid , ‘Mulato’.
A second hybrid accession , ‘Mulato II’ was developed from three generations of hybridization, commencing with the original B. ruziziensis x B. decumbens cross. In subsequent generations, sexual parents were exposed to pollen, either from hybrids with B. brizantha or from B. brizantha accessions, through open pollination . Microsatellite data clearly show that ‘Mulato II’ has alleles that are absent from the B. ruziziensis parent and also absent from B. decumbens cv. ‘Basilisk’, but that are present in ‘Marandú’ and/or in other accessions of B. brizantha.
Poor and not recommended at farm level.
No information available.
- High DM production.
- Good forage quality.
- Tall vigorous grass for cutting.
- Tolerance to spittlebug.
- Low yield of pure live seed.
- Viability of crude seed is poor.
- High soil fertility requirements.
- CIAT (2002) Variety: 'Mulato'. Application no: 2001/174. Plant Varieties Journal, 15, 20–21.
- Peters, M., Franco, L.H., Schmidt, A. and Hincapie, B. (2003) Especies forrajeras multipropÓsito: Opciones para productores de Centroamérica. CIAT Publication No. 333. CIAT, Cali, Colombia.
|Mexico (2000)||Derived from an initial cross made in 1988 between a tetraploid B. ruziziensis , clone 44-6 (sexual reproduction) and B. brizantha cv. Marandú (tetraploid, apomictic seed production). Tested for agronomic performance in small-plot field trials and regional trials in Colombia, and has also been widely distributed through CIAT’s regional trial network for adaptational/agronomic testing in Central America, Philippines and China. Final selection was based on tolerance of high soil aluminium, plant vigour, DM production and forage quality.|
|‘Mulato II’||Australia (2004)||‘Mulato II’ was selected for: tolerance of high soil aluminium, plant vigour, dry matter production and forage quality. Propagation: by seed. Breeding has improved spittlebug resistance, forage yield and quality, and seed yield.|
|Brazil||Better resistance to spittlebug than B. brizantha accessions (other than ‘Marandu’).|
|FM9503-S046-024||Colombia||Excellent adaptation to both low and high fertility environments on the Colombian Llanos. Moderate resistance to spittlebug.|
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