The time has come to do our post-emerge application of Roundup on our soybeans. This spring we used a pre-emerge herbicide on our our fields. The soybean fields looked so clean we delayed longer than usual with our post emerge application. When we started spraying we realized the mistake we had made. The remaining weeds were 1 foot or taller. Too large for Roundup to do significant damage to. Many will burn down and then come back. Scouting the field one week later we already saw signs of new growth on waterhemp that looked dead from a distance. We also found 1 1/2 foot tall waterhemp than had little or no damage to the plant from our Roundup application of 38oz/acre.
On two fields we chose to take more drastic measure and hired migrant workers to hoe out our resistant weeds. They showed up two weeks after spraying and spent a few days walking the fields.
We also dug our old bean rider out of the shed and did some field border spraying from that.
Not to leave any weed patches untouched, we finally brought out our own hoes and went after some stray weeds with them.