Results of a study evaluating the efficacy and crop safety of labeled post-emergence herbicides to control velvetleaf, a major agricultural weed in Nebraska that reduces yields in popcorn if not controlled.
Hemp exhibited high level of sensitivity to most of the tested herbicides. Visual injury levels ranged from almost no injury (~5%) with only one herbicide, to some temporary injury (~20%) with a few herbicides and severe injury or death (60%-93%) with about 10 out of 18 herbicides tested.
Hemp exhibited relatively good tolerance to several products that can be used postemergence in industrial hemp. It is important to note that the conclusions are based only on one year of data. This study will be repeated in 2021 season.
On Oct 27, 2020, The United States Environmental Protection Agency (USEPA) announced a new 5-year registration for XtendiMax® and Engenia, and re-registered Tavium (a premix of dicamba and S-metolachlor).