Abstract Background Weed interference in crops causesproblems that reflect in several losses. Several control methods are available, among them, chemicals are commonly used. Objective Our objective was to evaluate the effectiveness of different herbicides used alone and in combinations in the control of horsetail grass ( Andropogon bicornis ) at different phenological stages. Methods The experiment was carried out in an area with natural infestation of A. bicornis in the municipality of São Miguel das Missões, in Rio Grande do […]

Abstract Background although efficient, there are still few options for selective treatments with herbicides applied in the pre-emergence of cotton, and treatments that result in injuries to the crop are often carried out. Objective to evaluate the influence of the amount of bean or oat straw on the selectivity of the fomesafen herbicide applied in pre-emergence of cotton. Method two experiments were carried out simultaneously in a greenhouse in a completely randomized design, with four replications. The experimental units were […]

Abstract Blackground The species Maranta sobolifera L. Andersson (Caeté) is tolerant to chemical management and its dispersion in the agricultural areas of western Paraná has increased every year. Objective Evaluate the control of M. sobolifera using different doses of herbicides applied alone and in mixture in pot and field experiments. Methods In the pot experiment, isolated applications of glyphosate (2160 g ha-1), carfentrazone (60 g ha-1), and 2,4-D (670 and 1340 g ha-1), as well as mixtures of [fluroxypyr + […]

Abstract Background Knowledge of the seed bank present in soil of agricultural areas is essential for choosing the most appropriate management strategies for weed control. Objective Our objective was to evaluate the immediate viability of weed seed germination of soil conducted in a consolidated no-tillage system. However, there is uncertainty about the composition of the seed bank in no- tillage areas. Methods The soil was collected at a depth of 0 to 40 cm, stratified: 0-10 cm, 10-20 cm and […]

Abstract Background Elephant grass plants propagated by seeds are more likely to have injuries to herbicides, in their initial cultivation phase, when compared to those from cuttings. There are selective herbicides for elephant grass developed from seeds. Objective This work evaluated the tolerance of elephant grass implanted by seeds to auxinic herbicides and tembotrione. Methods Two experiments were conducted in the municipalities of Valença, Rio de Janeiro State, Brazil, and Coronel Pacheco, Minas Gerais State, Brazil. The experimental design was […]

Abstract Background Soybean is one of the most important crops planted in Brazil. The management of weeds becomes necessary, in this case the horseweed (Conyza spp.), because the lack of control is responsible for a significant reduction in production. No-tillage in the main straw system used in soybean crops and with the prohibition of the herbicide paraquat, used in the pre-planting of the crop in Rio Grande do Sul, efficient alternatives to this management were evaluated. Objective The objective of […]

Abstract Background The control of mature weeds in agriculture demands higher costs and more complex management strategies than the treatment of younger plants. This control is more difficult on regrowth weeds with morphologic, physiologic, and biochemical characteristics that provide higher tolerance. Objective This study aims to evaluate the control efficiency of different herbicides and associations, in different doses, on regrowth plants of Euphorbia heterophylla (L.) after the cultivation of common beans in a second harvest. Methods The experiment was conducted […]

Abstract Background 2,4-D is prepared in some formulations that may show differences in selectivity for cultures. Objective The objective of this work was to evaluate the effects of the application of 2,4-D amine and choline salts on the morphophysiology of wheat cultivars. Methods The experiment was conducted in a randomized block design, in a factorial scheme, with four replicates. In factor A, the control without herbicide, 2,4-D amine and choline were allocated, and in factor B, the wheat cultivars (ORS […]