One of the linchpins of an integrated weed management program is scouting, both before and after herbicide application.
You need to scout initially to determine what weed species are present, he says Then choose the appropriate products based on the pest spectrum.
You also need to scout after the application to determine the extent of control. If you see a healthy weed next to a dead weed next to an injured one, that’s a sign that something’s wrong.
Leaving those healthy but treated weeds in the field is the worst thing you can do, Steckel says. You need to remove them immediately.
Growers in the South learned the hard way. They saw a few Palmer amaranth plants escape glyphosate treatments one season. The next year, the problem had spread throughout most of the field. And by year three, the field was unharvestable and you couldn’t see the crop for the weeds.