Some species of Amaranthus are widely distributed in cotton crops. In recent years, ineffective weed control after herbicide use of some species has been reported. The current study was installed in order to find effective alternatives to a proper management of these species. Two simultaneous experiments were carried out for each species in this study (Amaranthus lividus and Amaranthus hybridus), and in each of them, a different stage of weed development (2 to 4 and 4 to 6 leaves) was […]

Macroptilium lathyroides (wild bushbean) specie was found infesting relatively large areas of soybeans in the southern region of Mato Grosso do Sul State, Brazil, where farmers complained about lack of herbicides efficiency in controlling this species. There is no herbicide registered for controlling this species in Brazil, and the amount of researches involving its susceptibility to several actives principles is so limited. This study aimed to verify the efficiency of glyphosate herbicide, isolated or in association with other actives principles, […]

Unsuitable weed management is one of the main factors responsible for low mean yield of cassava (Manihot esculenta Crantz) in Brazil. In this crop, mechanical weed control is the most commonly used, due to the lack of registered herbicides for cassava crop. In the search for alternatives to this problem, this work aimed to evaluate the tolerance level of cassavas cultivars to mesotrione herbicide applied in post emergence. A experiment was conducted, in green house conditions, in randomized blocks with […]

Herbicides may cause toxicity to the crop and also negative effects on yield characteristics and industrial quality of sugarcane. This study evaluated the effects ametryn, trifloxysulfuron-sodium, ametryn + trifloxysulfuron-sodium and sulfentrazone herbicides over quality and stalk yield of RB867515, SP801816, SP803280, RB937570 and RB925211 cultivars. The experiment was conducted at the Federal University of Viçosa, Viçosa County, Minas Gerais State. A distinct behavior was observed for the cultivars in the presence of herbicides, both for quality as for the stalk […]

The aim of this work was to determine residual activity of ACCase inhibitor herbicides applied at pre-sowing of corn crop. The experimental design was completely randomized blocks with four replications in a split-plot scheme, where the factor time interval (seven and two days prior to corn sowing) was the plot and herbicide treatments were the sub-plot: 1. check without application; 2. tepraloxydim (80 g ha-1); 3. tepraloxydim (100 g ha-1); 4. clethodim (72 g ha-1); 5. clethodim (96 g ha-1); […]

The use of scientific knowledge that make possible the characterization and choice of spray nozzle suitable to control of biological target is a function of application technology. This work aimed to characterize the volumetric distribution, the spacing between nozzles, the diameter and uniformity of droplets produced by spraying nozzle of centrifugal energy and control in post-emergence of I. hederifolia with herbicide diuron + hexazinone (1170 g ha-1 + 330 g ha-1) using spray volumes of 20 and 40 L.ha-1 with […]

The aim of the work was to evaluate the effect of nozzles and pressures on the spray drift from glyphosate + 2,4-D. The nozzles designs and the respective studied pressures were: XR 11002 (150 and 300 kPa), DG 11002 (300 kPa), TT 11002 (300 kPa), AI 11002 (300 kPa) and TXVS-10 (400 kPa). Nylon strings outside the application area (1, 5, 10, 20, 50, 100 and 200 m distance) with four replications and six foam cylinders placed on the boom […]

For cultivars with indeterminate habit, there are no reports of the most appropriate period to conducted burndown in pre-harvest. The study aimed to evaluate the influence of burndown on three different times over physiological and sanitary quality of seeds and agronomic characteristics of SYN-9074 RR cultivar with indeterminate habit, in three areas simultaneously. It was used a randomized complete block design with four replications, and joint analysis were conducted for the three distinct areas. Treatments refer to the application period […]

Several trials have been carried out for increasing glyphosate efficacy on weed burndown, including the addiction of ammonium sulfate and urea as adjuvants. On a physiological approach, there are explanations to complementary effect of these fertilizers when concomitantly added to herbicide spray solution. Therefore, three experiments were developed in field conditions with the objective of evaluating glyphosate efficacy for burning down different weed species by using solution of nitrogen fertilizers as spraying vehicles. Six treatments were evaluated, as follows: glyphosate […]

The objective of this work was to evaluate the deposition of a tracer solution constituted by glyphosate (2,160 g ha-1) + FD & C No. 1 (2,000 ppm) blushing with different sprayer nozzles in burndown of Panicum maximum cv. Mombaça plants, besides the  losses quantification of the sprayer to the soil. A randomized complete block design was used with four replications. Each experimental unit consisted of three lines with 5m long, spiced of 1.0 m. Treatments were applied 12 months […]

One of the most important aspects that include intercropping systems with respect of interspecific competitive ability of crops grown, however, while taking into account the integrated weed control. Because of this complexity, the adoption farming systems Crop-Livestock Integration is small, but with great capacity for expansion. Focusing on the factors that limit adoption of this system seems to be strategic point for further studies. Thus, the aim of this work was to compile a set of information related to weed […]

This study aimed to evaluate phytotoxic effects of glyphosate subdoses in seedlings of rubber tree (Hevea brasiliensis Aubl.). One year after seedlings planting three reduced rates of glyphosate were studied, as follows: T1 – 86.4, T2 – 172.8 and T3 – 345.6 g e a ha-1 and T4 – control (without application). At 7, 14, 21, 28 and 180 days after application (DAA) of herbicide, scores were assigned for visual phytotoxicity, and in the last evaluation were took measurements of […]

Chemical control is a viable tool and practically essential in the management of weeds control. However, insufficient details about application methods of pesticides have been observed in most scientific publications that deal with herbicides utilization. With the objective of verifying the presence or absence of basic information about herbicides application found in scientific papers, as well as to propose a criterion of minimum description needed with information that may guarantee better repeatability of methods and techniques used, it was conducted […]