The 2,4-D has been one of the most widely used herbicide in combination with glyphosate, especially in applications desiccation pre-planting. The objective of this study was to evaluate the effect of adding 2,4-D to glyphosate for the control of weed species considered difficult to control (Commelina benghalensis, Richardia brasiliensis, Euphorbia heterophylla, Spermacoce latifolia, Ipomoea grandifolia e Conyza spp.). The experimental design was completely randomized, and treatments were arranged in a 3 x 4 factorial design with four replications. The first […]

The winter field system has impacted the Conyza spp. infestation on the next Field. Thus, the aim of the research was evaluate burndown efficacy to Conyza spp. control in wheat crop area during the winter season, as well as at monitoring the residual effect of herbicides in soil on weed control within soybean cycle. The same experiment was conducted in two locations during the months of November 2010 and January 2011, in two locations in Rio Grande do Sul state […]

This research aimed to evaluate the selectivity and efficacy of glyphosate tank mixture with different post- emergent herbicides on controlling Commelina benghalensis in soybean RR® crop. The experiment was conducted in field conditions using complete randomized block design, with four replications, where the treatments were four rates of cloransulam-methyl herbicide (10, 20, 30 and 40 g ha-1), four rates of chlorimuron-ethyl herbicide (2.5; 5.0; 7.5 and 10 g ha-1), imazethapyr at 100 g ha-1 and lactofen at 72 g ha-1, […]

The objective of this study was to evaluate the effect of doses of paraquat and glyphosate on desiccation Brachiaria ruziziensis. The experimental design was randomized blocks with four replications. The rates glyphosate were 0, 90, 180, 360, 720 and 1440 g ha-1 and paraquat were 0, 50, 100, 200, 400 and 800 g ha-1. Based on the results obtained it can be concluded that paraquat was ineffective in desiccation B. ruziziensis and the glyphosate was only effective at rates of […]

The use of herbicides in turf grasses is a promising technique, since required precautions regarding the selectivity. In order to evaluate the selectivity and effectiveness of Kapina® and Kapina Plus® herbicides in controlling Cyperus flavus and Cyperus rotundus in Zoysia japonica and Cynodon dactylon, two experiments were conducted in green house conditions. Applications were performed with a CO2 pressurized spray, using application fee of 250 L ha-1. Kapina® e Kapina Plus® herbicides, from 750 mL ha-1, showed excellent control of […]

Caupi bean is grow by small farmer’s family using low technological level, where weeds management is conducted by hoeing, and an exhausted practice with low efficiency action. The objective of this study was to evaluate herbicides selectivity and control weeds efficacy in caupi crop, BRS Guariba cultivar. The experiment was conducted in field conditions with the application of herbicides (g a.e. ha-1) sulfentrazone (500) e oxadiazon (600), in pre emergence conditions, and bentazon (600), bentazon + paraquat (39 + 62), […]

In order to validate the hypothesis that sugarcane crop adequately fertilized is less damaged by herbicides, phytotechnical characteristics and isoenzyme profiles of α-esterase and peroxides in IACSP96-2042 and IACSP95-5094 sugarcane genotypes were evaluated, submitted to different planting fertilizers and treated or no with herbicides. In field conditions, two experiments were conducted, one for each cultivar, in vases (43 L), by using the randomized completely design with treatments arranged in factorial scheme 3 x 3 + 1, with four replications. The […]

Weeds from Amaranthus genus may cause major yield losses in economic crops, including cotton, if not controlled properly. In order to avoid it, it’s necessary correct species identification, besides herbicides suitability and recommended doses. The aim of this study was to develop the dose-response curve of ALS enzyme inhibitors herbicides (trifloxysulfuron-sodium and pyrithiobac-sodium) applied in pre emergence conditions becoming possible to verify the control effectiveness over four important species of Amaranthus (A. hybridus, A. viridis, A. lividus and A. deflexus) […]

The objective of this study was to evaluate the effects of glyphosate herbicide association with potassium phosphite in maize plants. The experiment was accomplished in green house conditions, with seeding of Pioneer 30F53H simple hybrid in vases. Experimental design used was entirely randomized with six treatments and four replications. Treatments application was made with plants in V7 developmental stage. Evaluations of electron transport rate (ETR) in photo system II were conducted during periods of 1, 2, 5, 32, 56, 80, […]

The use of contact action herbicides with paraquat usually requires more attention with application technology aspects in relation to the systemic action ones. In order to evaluate the efficiency and deposition of paraquat application associated with adjuvant and nozzles inclination angle in weeds control, an experiment was conducted in field conditions using a factorial scheme 2 x 3 +1, with five repetitions. Seven treatments were constituted by two conditions of Gramoxone® herbicide (paraquat, 150 g a.e. ha-1), used with Agral® […]

In the mechanical harvesting system of sugarcane, without previously burning (raw sugarcane), a straw layer is left over the soil, that may overcome up to 20 t ha-1, what  represents a difficulty for germination and emergence of some weed species being possible to  affect herbicides leaching and efficacy. This way, considering this environmental change, herbicides used for weeds control in pre-emergence conditions, in raw sugarcane system, must present some specific physicochemical characteristics to be effective on weeds control such as […]