I would like to know as well. The weed in the 3rd pic is the one I am referring to.
It is about the only one I see weeks after my R-1 pre/post. Obviously my post mix of 3-way/simazine doesn't phase it. However, Metsulfuron/MSO knocks it out.
If left untreated, the stem will eventually harden off and become woody. At that point it is more difficult to control.
I have looked at PBI Gordon's "Weed Alert" website in the past and not found it...so I am interested in knowing as well...just out of curiosity
I believe the leaves are opposite. Also what is that grassy weed. I havent got to see a seed head because he cuts it before I get over to look. I was thinking dallisgrass, dont think it is goosegrass because it doesn't spread out or lay out from the center in a rosette.