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Echinochloa glabrescens (Barnyard Grass) is an upright annual grass, 50-100 cm high, with a closely tufted habit in wetlands, but a spreading habit in dry situations. The leaf sheaths clasp the stem tightly and the leaf blades are strap-like, 10-20 cm long and 5-8 mm wide, with a long thin apex (tip). The inflorescence is closely branched, 10-20 cm long, and the flower clusters are 2.5-8 cm long and up to 7 mm in diameter. The fruit is held tightly within its bracts, and shed as a unit (PIER 2008).
· It prefers inundated areas, especially rice paddies, as well as fallow ground and cropping land.
· Vegetative fragments and seeds are probably dispersed in water.
· Other Barnyard Grasses are important weeds of rice in Australia.
Echinochloa glabrescens is native to eastern Asia (PIER 2008).
In south-east Asia, Echinochloa glabrescens is a weed of rice and maize (PIER 2008).
In Australia, Barnyard grasses (Echinochloa species) are problem weeds traditionally associated with sod or combine sown rice. Surveys in New South Wales suggest that Barnyard grasses are a major impediment to rice production. It requires significant expenditure in herbicides and extra water for control and reduces rice yields (Pratley & Broster 2004).