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  • Californian thistle on a pasture, blue sky behind.
    Rights: Dr Trevor James, AgResearch Published 11 October 2016 Size: 510 KB Referencing Hub media

    Californian thistle is widespread throughout New Zealand pasture and during its seasonal peak, covers 12% and 6% of grazed land on sheep and sheep/beef farms, respectively, resulting in revenue loss. The green thistle beetle (Cassida rubiginosa) was released in 2007 to help the fight against this invasive weed.

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