Spraying birch-tree-killing concentrations of Monsanto Amenity Glyphosate 360 at the JKW that has spread from the adjacent verge into our paddock has been pretty effective. If you've got big stalks of the stuff, cutting them off, rodding through the nodes with a skewer and filling the whole thing up with glyphosate is pretty neat. We've got to the stage of having the occasional widdy-wee bit poking through, which is irritating because it's difficult to subject such a small target to a large amount of Good, when you know that it's going to take a lot of Good to kill the EVIL RHIZOME.