I just took over 3 acres of pasture that has no trees, no flowers, and just a rough pasture grass. Nothing has ever been on this land nor has it ever been farmed. There were numerous weeds and all sorts of things in the pasture, so I decided to us Spectracide Pro - Broadleaf Weed Herbicide. I sprayed the entire 3 acres and it took out about 75% or more of the various weeds. Recently, crabgrass has taken over the front, and I purchased some Home Depot generic crab gass killer and it actually did a great job in killing the crab grass in the front 1 acre. My question is: Are there any pesticides that will kill the crabgrass along with all the other weeds? Should I just go back and use Spectracide Pro again and then spray for crabgrass? Are these two products about all I will need?