You are treating cool season grasses like I do. A lot of my lawns receive very little pre-emergent, only along edges and arrows where I have seen it previously. We don't have nearly the crabgrass pressure that the guys south of us do.
Mike's Total Lawn Care
I love my country, but mistrust my government, and the government doesn't create jobs, it just takes my money and gives it to other people or groups it thinks it can bribe.