Posted: 31/05/2017 at 18:46
There are loads of threads on the same subject. The basic answer is that there isn't a quick way to get rid of them. There's a chemical treatment called Kurtail which some people say works well, another suggestion is adding lime to the soil.
My method, which keeps them at bay for a year or so, is to trample on them then spray with Roundup or SBK brushwood killer. Even that is only a temporary solution. If the numbers are small, repeatedly pulling each stem is said to weaken the growth.