Fighting Roundup-Resistant Pigweed? Remember Wheat Restrictions.

The battle against Roundup resistant Palmer pigweed had what may be an overlooked consequence for farmers this fall: carryover problems in fields where they might want to plant wheat.

Larry Steckel, University of Tennessee Weed Scientist, posted a reminder about that in this week's IPM Newsletter.

"There have been a number of calls about planting wheat this fall after using fomesafen containing herbicides (Prefix, Reflex, Flexstar GT or Flexstar) this spring and summer, " Steckel reported. "The labels say that recrop back to small grains after a fomesafen application is 4 months. I would expect some wheat establishment problems from fomesafen applications made this July for wheat sowed in October or early November. This was not an issue 2 years ago but is another repercussion of trying to manage glyphosate-resistant Palmer amaranth."