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In page Jacobaea vulgaris:

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In many Australian states ragwort has been declared a noxious weed, and landholders are required to remove it from their property by law.[citation needed] In the island state of Tasmania, ragwort is responsible for more than half of the total costs of that state's control of invasive species. The species has been calculated as the 8th most expensive invasive species in terms of cost to Australian farmers, at over A$500m over 60 years.[1]