Barley grass is a problematic annual weed species in Australia, typically growing in areas with less than 425 mm of rainfall. It is commonly found in crop fields and pastures, on roadside verges and in livestock enclosures. Although valued for animal feed in pastures early in the season, upon maturity the long barbed awns of barley grass seeds irritate livestock and entangle in wool, reducing productivity and product quality. Barley grass can also serve as a host for pathogenic fungi and nematodes in cereal-growing areas.
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