Mow them weekly or peal off any new leaves anter cutting the stems down. It may take a couple of seasons, but without leaves the root will eventually die.

Alternatively, find 40% glyphosate. Cut off the sprouts at ground level and paint the cut surface immediately with the brush strength glyphosate. Repeat on any new sprouts.

Regardless of which method you use, the key is to prevent new growth of foliage so that the roots don’t survive.

Thank you so much. I had two beautiful lawns and due to this “ invasion “ I used a rototiller and now both are destroyed; there are roots still in the ground but just a couple of new suckers have appeared since; does this at all change the scenario re: your advice. I so appreciate your comments !!!!

Nope. no need to use a rototiller. Just persistence in not allowing any leaves to remain.

So what I have done is purchased everything Home Depot sells to start a new lawn in the fall ( late August) would you suggest I proceed with this?

I cannot help with a lawn as that is not my expertise. There is a lawn forum that can likely help you with lawn establishment.

You have been a great help. I owe you a few beers.

Always happy to share experience!