Wow! I didn't know about it 'till just now. Curious, so I Googled it...nasty stuff.
Don't allow it to seed. Two articles I just read indicate that glyphosate should do the job. Were it me, I'd mix a 5% to 7% solution in good water and have at them. Use a surfactant in the mix regardless, and ammonium sulfate if you have hard water.
I understand the seeds don't persist terribly long, that's good.