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Controlling Palmer Amaranth (Amaranthus palmeri) in Western Nebraska Cropping Systems
Palmer amaranth (Amaranthus palmeri S. Watson) is regarded as one of the most damaging and difficult to control weed species in crop production systems across the United States. In the Panhandle region of Western Nebraska there are few herbicide options to control herbicide-resistant Palmer amaranth due to specialty crop production and environmental restrictions. Growers in the Panhandle region are experiencing crop yield loss and due to Palmer amaranth control failures. Research presented in this dissertation focuses on the control of Palmer amaranth in dry bean and sugarbeet production. Results presented have far reaching impact as there has been limited research focused on controlling Palmer amaranth in dry bean and sugarbeet. Chapter 1 outlines Western Nebraska climate and cropping systems, general agronomic practices for dry bean and sugarbeet production, background on Palmer amaranth, and limitations of Palmer amaranth control in dry bean and sugarbeet. Chapter 2 evaluates the performance of pre-emergence (PRE) and pre-plant-incorporated (PPI) herbicide programs and the effect of planting timing on Palmer amaranth control in dry bean. Chapter 3 evaluates the performance of post-emergence (POST) herbicide combinations and the performance of a reduced rate sequential application POST system for control of Palmer amaranth in dry bean. Chapter 4 investigates the potential for Palmer amaranth control in sugarbeet with the post-emergence (POST) herbicides desmedipham and phenmedipham. Chapter 5 determines the critical timing of weed removal in dry bean with and without pendimethalin plus dimethenamid-P applied pre-emergence (PRE).
Beiermann, Clint W, "Controlling Palmer Amaranth (Amaranthus palmeri) in Western Nebraska Cropping Systems" (2020). ETD collection for University of Nebraska - Lincoln. AAI28023189.