I have some browntop millet headed out and dry. It has been inundated with crab grass and johnson grass I want to get rid of. There are also a few broadleaf. If I spray with combination gly and 24d, will I get any residual effect from the 24d that would keep seed off the millet from sprouting. I would like to plant wheat there in a month and a half. Would any residual effects damage the wheat planting?