glyphosate and couch grass

i have an area of my 2nd plot that is so bad with couch grass roots that i cant even get a hand spade in without hitting bunches of the stuff, my question is, will glyphosphate kill the roots of couch grass if i let the grass grow and then spray it? or do i have to dig it over and hand pull the roots  


(Edit to spelling in title)

yes it will kill it, but the roots will still be there, just dead so you will still have to dig them out

I've just read on my 'veg calendar' that , if you plant Swede where couch grass grows, it'll wilt and die!

Anyone heard of / done this?? And does it work?

I have grown swede for the last two years and have had couch grass in amongst the rows  my grass must be super dooper couch grass. (typical    )

Afraid it's the big dig-out method, no other way works, although the weed killer will make the roots go wiry as well as dead.

We actually used a spade to dig a few spits, then clouted each clod (this was back in the days when we had rain...), to release the roots.

Yes, there were a few pieces of root left behind, but we'll have much less to do next year.

I dont think it is either or, I would do both - dig out everything you can then nuke with glysphosphate when the stuff you missed starts to pop up. If you spray first you are still going to have to dig out the roots anyway.