Poa Trivialis and Confessions of an Organicist

I have a moderate incursion of Poa trivialis (okay, it could be P. annua but I'm not inclined to do a precise ID...it's one or the other). And I just broke down and spot-sprayed all of it with Certainty herbicide.

So much for 100% organic this year. However, if I let that go it'll beat up on my new grass. That's not acceptable.

No, I'm not taking photos. The lime green incursion into the darkening lawn is awful.