Posted: 31/10/2014 at 12:14
Eventually it will, but as others have said, there has to be enough green material above ground for the weedkiller to be taken down to the roots. At this time of year there will be very little new growth so you'll need to wait till spring now for any further applications. Dig out roots over winter if you have the inclination, or leave till then and start a new regime with your weedkiller.
It's a very persistent weed, like many others, but the better you have the ground before you plant, the better the result will be.