Dig by hand or spray with herbicide. Have only seen one kind listed for this plant, with comments on how to apply it to acreage. Since this is a common pest here, local garden centers will be asked how to get rid of it frequently - if there is a product suitable for homeowner use available, they will have it.
I suspect that it is really bad stuff, but... This weed is very widespread here, and some years ago I bought a chemical called "MCP" - acronym for a chemical compound, not a trade name, I think - said on the label to get rid of three or four weeds including this one. I don't recall ever using it, but this year the weed started to take over my entire lawn so I applied it as directed. The weeds all died. The biggest success story I've ever had in weed eradication. But I am still troubled about what I did to the environment.
