Tomatoe, weed control
Is there any herbicides out there to control postemerge broadleaf weeds (lambsquarter).
Clinton County Michigan
I am assuming you are not a commercial grower or have a Restricted Use Pesticide license. In which case you are essentially limited to mechanical cultivation or hand pulling for postemergence control.
The best time to control them is through pre-emergence products such as trifluralin, the ingredient in the Preen product.