Abstract: Background: Ryegrass (Lolium multiflorum) is one of the most detrimental weeds to rye (Secale cereale) grain yield, as it competes for limited and essential resources needed for crop growth. Objective: To identify explanatory variables for determining the competitive ability and economic damage level (EDL) of ryegrass infesting rye crops. Methods: The field experiment was conducted during the 2018 growing season using a completely randomized design. Treatments consisted of rye genotypes (BRS Serrano, IPR 89, BRS Progresso, and Crioulo) and […]