The objective of this study was to evaluate the effects of the use of residual herbicides applied in the pre-emergence of beans, on reducing weed infestations, and the agronomic performance of the crop. Two field experiments were conducted, one had the cultivar UFT -06 (Carioca Group, short cycle and erect) and another, the IPR Graúna (Black Group, long cycle, prostrate habit). The treatments consisted of application of the herbicides pendimethalin (1.2 and 1.4 kg ha-1) and trifluralin (1.2 and 1.4 […]

The high frequency of M. aegyptia in sugarcane harvested mechanically is related to its adapting behavior to this harvesting system, what resulted in an increased the infestation potential of this species in relation to other weeds. The aim of this study was to evaluate the management M. aegyptia by spraying pre-emergence herbicides, in the presence and absence of straw in clay soil, under different rainfall simulation. Two experiments were carried out in a completely randomized design with four replications. In […]

The aim of this work was to characterize the onset of weed interference in two soybean cultivars, with different growth cycle, under two conditions of corn plants infestation. The experimental design was split plot design composed by two factors: periods of coexistence of soybean with corn (no coexistence, coexistence during 14, 28 and 42 days after sowing (DAS) and throughout the soybean cycle) and  two corn densities: 10 plants m-2 and 30 plants m-2. The cultivar Fundacep 63RR had its […]

The aim of this work was to investigate the synergism or antagonism of glyphosate with and without mixing with saflufenacil to control B. decumbens. The following treatments were evaluated: glyphosate (1.080); glyphosate + saflufenacil + Dash (1,080 + 24.5 + 0.5 % v/v); glyphosate + 2,4-D (1,080 + 720); glyphosate (1,440); glyphosate + saflufenacil + Dash (1,440 + 24.5 + 0.5% v/v); glyphosate + 2,4-D (1,440 + 720); saflufenacil + Dash (24.5 + 0.5 v/v); 2,4-D (720), doses in g […]

The genus Conyza includes approximately 60 species which are widely distributed across the globe. The species Conyza canadensis and Conyza bonariensis are noted for their ability to invade abandoned areas, pastures, perennial crops and annual crops. The objectives of the present study were to: (1) characterize the leaf surface of C. bonariensis and C. canadensis by scanning electron microscopy, (2) evaluate the control of these plants with glyphosate mixed with herbicides distinct mechanisms of action. To analyze the leaf surface […]

Management practices integration as an auxiliary tool in weeds chemical control in post emergence in corn crop (Zea mys L.) may reduce herbicide dose to be applied. Thus, this study aimed to evaluated by  spacing changes, the reduction possibility of tembotrione and mesotrione herbicides  recommended doses of and without damaging weeds control and corn yield. The experimental design was randomized complete blocks, arranged in split-plot scheme with four replications. Treatments used were two row spacing (0.40 and 0.80 m); two […]

Species belonging to Digitaria genus are including among major weeds infesting rice and soybeans crops. The objective of this study was to evaluate the differential susceptibility of crabgrass biotypes crops at Rio Grande do Sul State, to clethodim or cyhalofop herbicides. Three experiments were conducted in greenhouse conditions, in the period of 2009-2011 agricultural years. Seeds of Digitaria spp. were collected from different places in the State, covering areas of irrigated rice production and soybeans crops, totalizing 169 biotypes. To […]

With the objective of evaluating the potencialization efficiency of mesotrione in tank mixture with inhibitors Photosystem II in Digitaria horizontalis control, four experiments were conducted in plastic greenhouses belonging to Superior School of Agronomy of Paraguaçu Paulista County, São Paulo State, being used a Latosoil with sandy texture. The experimental design of four experiments was entirely randomized, with 10 treatments and 5 replications, in factorial scheme 3×3+1, being considered the contrast between mesotrione (96 g ha-1) and inhibitors of the […]

The volunteer corn Roundup Ready® has been effective managed by ACCase graminicides as burndown prior to sowing soybean. However, before crop installation, there are other glyphosate-tolerant weeds in the field such as Conyza sp., Commelina sp., Ipomoea sp., Spermacoce latifolia and Richardia brasiliensis. Thus, the tank mixture of ACCase inhibitor herbicides with 2.4-D, is increasing in this segment. The present study evaluated the efficacy of Haloxyfop (GF-142) isolated and with 2.4-D (DMA 806 BR®) to volunteer corn control sprayed at […]

The management of coverage species may be accomplished by mechanical or chemical methods. In chemical method nonselective herbicides are used mainly the ones belonging to glyphosate group. The objective of this study was to evaluate phytotoxicity and agronomic efficacy of two formulations with active ingredient glyphosate over desiccation in ground cover species. The present study was conducted in field conditions in Marechal Candido Rondon County, Parana State. Experimental design used was randomized complete blocks with four repetitions in factorial scheme […]