Last year we sprayed 5 oz bifen on the full season milo shortly before heading.

On the double crop we sprayed 4 oz lambda cy with our pre- emerge, found some in the milo later but never enough to spray for. There was enough coming out of these fields before planting that the corn across the road was starting to die and had at least 1000 bugs per plant, sprayed outside pass and was not a problem again.