The objectives of this study were to determine the effectiveness of the control of imazamox and saflufenacil herbicides isolated and in combination with copper hydroxide (copper ion source) in the control of macrophytes (Ceratophyllum demersum) and to determine the efficacy of control of unicelular (Ankistrodesmus gracilis) and filamentous (Pitophora kewensis) algae mixtures imazamox + 0.1% copper and saflufenacil + 0.1% copper, in laboratory condition. For the control of C. demersum, the experiments were installed with concentrations of 0.01; 0.1; 1.0; […]

The selection of Spermacoceae densiflora specie has been verified in areas with the continuous use of glyphosate herbicide. The objective of this work was to evaluate the effect of glyphosate-isolated or associated with herbicides applied in post-emergence of S. densiflora in seed and sprouting plants at different phenological stages. In both cases, a completely randomized design with 5 replications in a 2 x 17 + 1 factorial scheme was used, being two weed phenological stages (4 and 8 fully expanded […]

The continuous use of glyphosate in soybean has led to the appearance of resistant weeds. Thus, alternatives to manage resistant plants are needed, such as the use of products with different mechanisms of action. In this study, the efficacy of the post-emergence application of herbicides with different mechanisms of action in the control of weeds in soybean crop was tested. The experiment was conducted in the 2016/2017 season, in Cambé-PR, using randomized blocks, with four replications. We evaluated the following […]

The resistance of weeds to herbicides demands new strategies of chemical management of the intraspecific community, considering their capacity of interference in cropping systems. The objective of this study was to evaluate the efficacy of ACCase inhibitors applied in a mixture or sequential with the herbicide 2,4-D, as alternatives for control of sourgrass. The experimental design was in randomized blocks, with eleven treatments and four replications, between 2015 and 2016. The compounds were determined by the herbicides cletodim, haloxyfop-p-methyl, fenoxaprop-p-ethyl, […]

Efficient weed chemical control with post-emergence herbicides depends upon the phenological stage of the target plants in the moment of application. In this sense, plants’ phenological stage is an important variable to be considered in the production environment, once it interferes on product’s efficacy and demands reallocation of the recommended rates. Thus, this work was developed with the objective of evaluating glyphosate-susceptibility of sourgrass influenced by the phenological stage at the moment of application. Two similar experiments were carried out, […]

The herbicides indaziflam and amicarbazone effectively control weeds, as they persist for long extensions in the soil. The objective of this work was to evaluate the residual effect of indaziflam and amicarbazone in contrasting textures. Two experiments were conducted, one experiment for each herbicide using a the randomized block design, with four replications, in a 2×6+1 factorial scheme, that is, two types of soils, six application times (0, 20, 40, 60, 80 and 100 days after application – DAA) and […]