Several environmental conditions may directly interferes with the effectiveness of herbicides weed control, therefore, the aim of this research was to evaluate the best climate moment to initiate chemical horseweed (Conyza spp.) control; as well as to evaluate the level of glyphosate tolerance on horseweed population. These trials were conducted in Indianópolis region, Minas Gerais State. The experiment 1 was designed as factorial (2×5) with first factor being the weather period conditions, dry or wet, comparison at first application time […]

Paspalum virgatum L. is a grass weed common in pasture and has difficult control, mainly due to its similarity to forage. Conventional techniques such as grazing and replanting of pasture have been unsatisfactory in the control of this weed. The objective of this work was to evaluate the control of the razor-blade grass (P. virgatum L.) at the pre-emergence atrazine, by means of a dose‑response curve and the selectivity of this herbicide in the pastures of Brachiaria brizantha cv. Marandu […]

To increase the weed control spectrum in corn, the herbicides formulation with active principles of different mechanisms of action is an important alternative. With the objective of evaluating the control promoted by the new herbicide Calaris®, composed by the mixture of [atrazine + mesotrione] applied in postemergence of weeds, alone or in combination with other herbicides, experiments were conducted in a greenhouse, one for each weed evaluated, in a completely randomized design with 16 treatments and four replications. Weed seeds […]

The objective of this study was to evaluate the efficacy of glyphosate, saflufenacil, imazamox, imazapyr and penoxsulam alone or in combination in the control of Urochloa subquadripara. To do so, in greenhouse, five plant pointers were transplanted into 2.5 liter boxes containing 5.0 cm of soil, washed coarse sand and organic compound (1:1:1; ratio). After 30 days, the herbicides with costal sprayer were applied at a constant pressure of 25 p.s.i. maintained by CO2, with consumption of syrup equivalent to […]

Due to the increasing number of grasses selected for resistance to the EPSPS and ACCase inhibitors, new alternatives with effective and selective herbicides from different mechanisms of action must be developed. This work was carried out to evaluate weed management systems containing the new herbicide pyroxasulfone aiming at controlling goosegrass (Eleusine indica) and sourgrass (Digitaria insularis) in applications immediately prior to soybean sowing. The design used for the randomized blocks, with eleven treatments and four replicates. All residual herbicides were […]

In Brazil, weed resistance to glyphosate is increasing for both broadleaf and grass species in the same area, making necessary to develop effective management strategies. The objective of this study was to determine the efficacy of the herbicide haloxyfop-p-methyl plus glyphosate in Digitaria insularis (sourgrass) when mixed with auxin mimics herbicides. The experiments were carried out in two locations, Mogi Mirim/SP and Indianópolis/MG, in a randomized complete block design, with four replications. The herbicide treatments were: haloxyfop-p-methyl (124 g ai […]

It is necessary to identify new herbicides with a wide spectrum of weed control for bean crops, and have an adequate security margin for this crop. The main objectives of this work were to evaluate the potential use of ethoxysulfuron herbicide on controlling weeds and three soybean cultivars between bean crop, as the tolerance of IAC Imperador bean cultivar to this herbicide. An experiment was conducted on field with a split-plot design. At the whole plot were allocated the doses […]

The objective of the research was to determine the efficacy of pre-emergence-applied herbicides sprayed at different rates and times before soybean planting under water deficit conditions, to control volunteer cotton plants tolerant to glyphosate and ammonium glufosinate and Eleusine indica. The trial was conducted on Formosa do Rio Preto/BA, during the 2015/16 growing season, in a randomized complete block design, with four replications and ten treatments, which included: glyphosate + diclosulam 960 + 25,2 g ha-1 a.i., glyphosate + diclosulam […]

The use of herbicides is very used by growers for the control of weeds. However, their effectiveness can be compromised by the reduction of water in the atmosphere, influencing its uptake, translocation and metabolism in plants. The objective of this study was to evaluate the efficacy of herbicides paraquat (Gramoxone) and glyphosate (Roundup Original) for the control of Urochloa decumbens (Stapf) R. D. Webster (Poaceae) and Merremia cissoides (Lam.) Hallier f. (Convolvulaceae) when submitted to hydric deficit. The experiment was […]

In Brazil cropping systems is common a rotation between soybean, corn and / or cotton, all resistant to glyphosate, which favor the selection of glyphosate resistant sourgrass populations (Digitaria insularis). Little is known about alternative chemical control of D. insularis registered for the corn and cotton crops. Thus, it is relevant to investigate herbicides with alternative mode of action, applied in pre and post-emergence conditions, to be used for efficient control of the glyphosate resistant sourgrass biotype (D. insularis). The […]