Preemergent for crabgrass and goosegrass

We are spraying preemergent for crabgrass and goosegrass. If you haven't done it yet it would be a good time for you to as well. It is  a sign to put out your preemerge when the Forsythia is about to bloom or just has bloomed and before the Dogwoods bloom. This is a picture if bloomed Forsythia.