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 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 […]

The use of adjuvant can influence the selectivity of herbicides on crops. Aimed to evaluate the selectivity of herbicides with different concentrations of mineral oil adjuvant in cassava ‘Cascuda’. The experimental design was a randomized block design with four replications. We used a factorial design 3×3+1 which consisted of three herbicides clethodim (120 g ha-1), fluazifop-p-butyl (250 g ha-1) and mesotrione (240 g ha-1), three concentrations of mineral oil (Assist®) 0.0, 0.5 and 1.0% v v-1, and a control without […]

The frequent use of glyphosate in citrus cropping systems of citrus in Brazil has selected resistant populations of sourgrass (Digitaria insularis) to this herbicide, and it is important to characterize this resistance levels for reasons of rational recommendations for management measures. Thus, an assay was conducted to elaborate comparative dose-response curves between two biotypes sourgrass weed, one resistant (R) and one susceptible (S) to glyphosate. The assay was conducted in a greenhouse from February to May 2012, with five doses […]

The control of weeds in winter crops is done primarily with ALS-inhibitor herbicides. The intensive herbicide use in areas with wheat has provided selection pressure on R. raphanistrum resulting in biotypes resistant to these herbicides. The objective of this work was to determine the existence of cross and multiple resistance to ALS-inhibitors herbicides and alternatives to chemical control of this weed resistant to metsulfuron methyl. Treatments consisted of R. raphanistrum resistant (biotype R) and susceptible (biotypes S), with 12 herbicides: […]

Herbicides applied in previous crop may present residual effects, causing injuries in the crop in succession. Furthermore, it essential the research of tolerant crops to possible residual effects which is denominated like carryover. The objective of this research was to evaluate the carryover effects of the herbicide associations adopted in the desiccation for the soybean cultivate, in Crambe abyssinica FMS-Brilhante cultivar, grown in succession. The experiment was established and conducted in a completely randomized experimental design, with eight treatments and […]

Aminocyclopyrachlor and indaziflam are two new molecules that are currently under development in Brazil. Aminocyclopyrachlor is an auxinic herbicide, and indaziflam acts in the biosynthesis of cell wall and both herbicides are expected to have great potential for pre-emergence weed control. Aminocyclopyrachlor is selective to the species belonging to the Poaceae family, while indaziflam is less selective for annual crops, and is under development for perennial crops. Although the two herbicides pose distinct properties related to sorption to soil, both […]

This work aimed to evaluate the effectiveness of herbicides  applied during post-emergence on weed control in onion crop that recently have infested the onion crop areas in  Monte Alto city, São Paulo state, Brazil. Fourteen herbicides, either alone or in mixture, were tested to control Sisyrinchium micranthum Cav. and an unidentified specie of the genus Agrostis. The herbicides used were: flumioxazin, bentazon + ioxynil + oxyfluorfen, fluazifop-p-butyl, fluazifop-p-butil + ioxynil, fluazifop-p-butil + oxyfluorfen, paraquat + oxyfluorfen, paraquat + fluazifop-p-butil + […]

In sugarcane areas of Parana State, Panicum maximum (guinea grass) and Brachiaria decumbens (signal grass) stand out as weeds with difficult control and may compromise the useful period sugar cane crop. This research aimed to evaluate alternatives to chemical scavenging of P. maximum and B. decumbens clumps in sugar cane crop. This way, two experiments were conducted in field conditions by using a complete randomized block design with four replications for the first and five for the second one. In […]