I have already purchased the Scott’s complete 4 step year round maintenance regimen. However, I’m still concerned about my front lawn because it has a fair number of dry patches and dead spots. Is this caused by grubs and if so, can I apply something to address this even though I just recently applied crabgrass preventer/lawn food to it?
Hard to say. Perhaps you should ask the folks at the place where you purchased the Scott’s 4 step program.
I’d suggest taking some pictures of the area on your phone and even a cut out sample of the dead spots and bring them in to Hewitt’s for a closer look so they can help you figure out what is going on and come up with a solution.