In Rio Grande do Sul, wheat farming faces challenges related to production costs, market conditions, and climate risks—factors that have influenced cultivation decisions in recent seasons. Ryegrass is the most problematic weed due to its morphological and physiological similarity to wheat; both compete intensely for the same resources. This similarity drastically limits the herbicide options available for management, thereby favoring the weed's persistence. The impacts of this competition can result in a 40% to 52% reduction in grain yield (FLECK; PAULITSCH, 1978), compromise wheat quality, increase operating costs, and hinder harvesting.
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