No, not unless you have a lot of thatch.

Dead grass blades lying underneath the grass canopy is not that uncommon especially coming out of winter. Once the soil warms up that stuff should disappear with normal soil microbial activity. Thatch is not simply dead grass blades, so I agree it is very likely unnecessary.

I have heard reports of forsythia getting tricked by the weather this year. I would put the preemergent down now. Do you see any weed growth anywhere? It's getting pretty late into April to not see anything.

thanks for the help.

no weed growth, my lawn is pretty thick, nothing even in the one problem area I have along one portion of my driveway.

we had a late season snow storm on April 1st. the snow finally finished melting this past week-end.

forsythia seems to be the rule of thumb in my area...

???