Weed management in onion culture is a fundamental practice to reduce or eliminate interference from weeds community, since the crop, especially in direct sowing system, presents slow initial growth and low competitive capacity. In this sense, for the correct use of the herbicides it is necessary to know the effects provided by the doses in the onion crop as well as to quantify this effect for the different phenological stages. In view of the above, the purpose of this study […]

O objetivo do estudo foi avaliar o manejo químico de Urochloa ruziziensis consorciado com soja em sistema de plantio direto na savana de Roraima. O experimento foi conduzido em campo, em área experimental localizada no município de Boa Vista – RR, no ano de 2015. Os tratamentos consistiram da combinação de quatro doses do herbicida glyphosate (720; 1.200; 1.680 e 2.160 g ha-1 de i.a) pulverizado antes da semeadura da soja como dessecante e cinco doses do herbicida fenoxaprop-p-ethyl (0; […]

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 […]

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 […]

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 […]

This work was carried out to evaluate imazethapyr persistence in the soil, as well as the phytotoxicity of this herbicide to the corn crop seeded in succession. Treatments were organized according to a factorial scheme with two types of soil (S; clay and sandy), three regimes of irrigation (I; daily, weekly and no irrigation) and four timing (T) of herbicide application (90, 60 and 30 days prior to corn seeding, besides check plots without application). For that, imazethapyr was applied […]