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 […]

Ryegrass is an annual cycle weed, present in winter crops, orchards and vineyards of southern Brazil. The species is typically controlled by the herbicide clethodim. However, continued use of this product selected resistant biotypes. Thus, the objective of this research was to evaluate the response of ryegrass populations resistant to clethodim to the application of herbicides of different mechanisms of action, and propose chemical control alternatives. An experiment was carried out in the Brazilian city of Coqueirosdo Sul, in a […]

Ryegrass is an important weed in maize crops and winter cereals. The emergence of glyphosate-resistant biotypes, the main herbicide used in the Brazilian agricultural system, and the ability of natural reseeding, have raised the need to seek alternatives to minimize seed bank replenishment of this species. The objective of this study was to evaluate the effect of herbicide application at different growth stages of glyphosate-sensitive ryegrass plants on the viability of seeds from these plants. To this end, ryegrass plants […]

The objective of this paper was to identify alternatives for the chemical handling of weeds that infect wheat, as well as verifying the phytotoxicity of herbicides on the crop. The experiment was carried out in randomized blocks, organized in a factorial design of 2x 13, with four repetitions. The wheat crops were allocated to factor A (Quartzo and Pioneiro) and the herbicides to factor B (iodosulfuron – 0,100 kg ha-1; imazapic + imazapyr – 0,140 kg ha-1; clomazone 0,800 L […]

Ryegrass (Lolium multiflorum) is an annual grass, traditionally used as forage that has become weed in crops in the south of Brazil.  It has been observed that there are ryegrass biotypes resistant to glyphosate that survive the application of herbicides that inhibit ALS and ACCase. Therefore, the objective was to evaluate the sensitivity of different ryegrass biotypes to glyphosate, iodosulfuron-methyl and clethodim herbicides. The experiment was carried out in a greenhouse, in randomized blocks, in a triple factorial arrangement with […]