Pigweeds can often become a problem in small grains. However, their exact impact on yield is unknown. University of Minnesota Extension crops educator Jared Goplen says there has been movement towards a zero weed threshold. “In the era of herbicide resistance, we’re thinking more about the long-term seed bank. So if one weed if one weed produces seed, that will amplify the number of weeds for next year.” As the harvest of small grains creeps closer, Goplen says post-harvest weeds are also a concern. “There are broadleaf weeds in the crop canopy waiting to pop up once the crop is off.”
Subscribe to RRFN
Get a weekly digest from RRFN to stay up-to-date on all the latest news in agriculture.