Common waterhemp (Amaranthus rudis) interference in corn

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Herbicide Metabolism: Crop Selectivity, Bioactivation, Weed Resistance, and Regulation (2019, background): “Resistance in Amaranthus tuberculatus Amaranthus tuberculatus is a problematic, summer annual broadleaf weed species severely affecting maize, soybean, sorghum, and cotton production in the United States (Hager et al. 2002; Heap 2018; Steckel and Sprague 2004).”
The Dioecious Amaranthus spp.: Here to Stay (2007, background): “Waterhemp has reduced corn yields from 13 to 74%, soybean seed yields by as much as 56% when it emerged with the crop, and 10% when it has emerged as late as the V4 soybean stage (Bensch et al. 2003; Steckel and Sprague 2004a, 2004b; Steckel et al. 2003).”