I don't think that's Dallis. I think that's plain old crabgrass. Did you put down preemergent this spring? Have you tried any selectives on it?
If it is crabgrass, a quinclorac concoction would normally be the recco. However, between the clover, dandelion, and others I think you need more than just quinclorac. I would do a round of Tzone which should take care of most of that. You'll probably need a second application to get it all.