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 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 control of weeds in the coffee crop is hampered by the scarcity of selective herbicides for the growing crop. An alternative to circumvent the damage caused by herbicides is the use of chemical protectors with the ability to minimize herbicide intoxication. The objective was to evaluate the selectivity of herbicides applied alone or in a mixture in the tank with Fertiactyl Sweet® for recently transplanted coffee plants. The experiment was carried out in pots in a completely randomized design, […]

On the rice crop, weed species more adapted to the production system appear in greater incidence in the area, thus, crop rotation can be an alternative to help reduce the weed seed bank. In this sense, the objective of this work was to evaluate the dynamics of the barnyardgrass (Echinochloa spp.) and alexandergrass (Urochloa plantaginea) seed banks in lowlands, in response to crop rotation and soil management. Rice, soybean and sorghum crops were used under conventional tillage and no-till system, […]

The species Urochloa decumbens is an important weed of agricultural crops due to the high adaptive capacity and difficulty of management. The presence of these plants into agricultural production areas can cause serious problems when it competes for water, light and nutrients, besides acting as host of pests and common pathogens to the crop and interfering in harvesting. The study aimed to evaluate doses of control of U. decumbens plants by glyphosate application. Three experiments were conducted, in greenhouse in […]

It is essential the rotation of mechanisms of action in the management of glyphosate resistant weeds, in this context the use of ALS inhibitor herbicides in association can aid in the control. The aim of this work was to evaluate the efficacy of sulfometuron, chlorimuron and other sulfonylureas, isolated and in associations in the control of Wild Poinsettia, Morning Glory and Greater Beggarticks. Three greenhouse experiments were carried out in a completely randomized design with four replications. The treatments corresponded […]

The most common solution for problems on weed control in agricultural system of production is the inclusion of alternative herbicides, applied isolated or in tank mixtures. Thus, this work was carried out with the objective of evaluating the efficacy and interaction of metsulfuron‑methyl and glyphosate tank mixtures for weed control. For that, two independent trials were performed, evaluating different bioindicators, being one monocotyledonous (sourgrass – Digitaria insularis) and one dicotyledonous (morning glory – Ipomoea triloba). Treatments were consequence of a […]

Volunteer soy is a problem in maize cultivation, interfering with its development and growth. The objective of this work was to evaluate the efficiency of herbicides used in maize for the control of volunteer soybean plants in two phenological stages. The experiment was conducted in a greenhouse, in a completely randomized experimental design in factorial 2 x 11, having as factors two phenological stages and eleven herbicides spray, with four replications. The herbicides spray were composed by: nicosulfuron (40 g […]

In order to increase the efficiency of the use of cover crops, it is important to know which species present the greatest suppression of weeds and if the cover crop management method affects the suppression effect. The goal, with this work, was to evaluate the suppressive effect of different winter cover crops and their different managements through the use of phytosociological indices. The experimental design used was of randomized blocks conducted in a 4 × 3 factorial scheme with four […]