Abstract: Background: Cassava (Manihot esculenta) is native from Brazil, widely cultivated across the country, and is the third largest source of food in the Brazilian tropical regions. Mechanical weeding is commonly used for weed control in cassava, which can be associated with herbicides. Objective: To evaluate the weed control, phytosociology, yield, and sensory analysis of cassava treated with pre-emergent herbicides. Methods: Two field experiments were conducted, with a randomized block design and four replications. The treatments consisted of the herbicides […]

Abstract: Background: Benghal dayflower is a weed widely distributed in Brazil, known for its tolerance to glyphosate, requiring the use of alternative herbicides and more complex control strategies. Objective: Evaluate different auxinic herbicides in combination with glyphosate for the control of Benghal dayflower and assess the efficacy of glufosinate alone or in combination with PPO inhibitors in sequential applications. Methods: Two experiments were conducted in Ponta Grossa (PR-Brazil), using a randomized block design. The first experiment evaluated different auxinic herbicides […]

Abstract: Background: Volunteer Acacia mangium represent a major challenge in Eucalyptus plantations due to the large seedbank remaining in the soil. The use of pre-emergent herbicides with residual effects is essential for achieving effective control of these weeds. Objective: To identify effective pre-emergent herbicides, with residual effects for controlling volunteer A. mangium in Eucalyptus plantations. Methods: Completely randomized design (CRD) was used with 4 replications. Trays (50 × 33 cm) were filled with a loamy topsoil from commercial plantations. Each […]

Abstract: Background: Lupin is a legume used for human and animal consumption, ground cover, and weed control. However, given the weeds’ interference, there is still a need for registered herbicides to aid in the lupin cultivation process. Objective: To evaluate the selectivity of herbicides applied in pre- and post-emergence stages of lupin cultivation. Materials and Methods: Two experiments were conducted in a controlled environment at 23–25 °C and under a 12-hour photoperiod, in a completely randomized design with five replicates. […]

Abstract: Introduction: Urochloa plantaginea is a weed species characterized by rapid growth, high water use efficiency, and a strong ability to extract nutrients from the soil. As such, it can reduce the photosynthetic capacity of crops during early development stages and negatively impact their productivity. Objective: To evaluate the effect of time on the absorption of spray solutions of glyphosate-based herbicide formulations in the non-treated parts of U. plantaginea plants. Methods: A completely randomized experimental design was used in a […]

Abstract: Background: The genus Cynodon has great forage potential, but the management of its cultivars in Brazilian growing conditions is scarce. Objective: The objective was to evaluate the tolerance of Tifton 85 and Jiggs to different herbicides at post-emergence. Methods: The experiment was carried out in pots in a greenhouse. Two experiments were carried out, with Tifton 85 and Jiggs forages using twelve treatments, eleven herbicides (2,4-D, diuron, atrazine, fluazifop-p-butyl, glyphosate, nicosulfuron, imazethapyr, clethodim, haloxyfop-p-methyl, lactofem, tembotrione) and a control […]

Abstract: Background: Weeds compete with crops for resources, reducing agricultural productivity. Management practices involving cover crops and potassium fertilization can influence weed community dynamics. Objective: To evaluate the weed community in a Urochloa ruziziensis-sillage maize (Zea mays L.) for silage succession system, considering different potassium fertilizer (K) rates applied to the cover crop. Methods: During the fall-winter season, treatments included U. ruziziensis with six K rates (0, 30, 60, 90, 120, or 150 kg K2 O ha−1 as KCl) and […]

Abstract: Background: The effects of applying herbicides in a mixture with foliar fertilizers on soybeans are extremely important for successful production. Objective: To evaluate the effect of glyphosate formulations applied in mixture with sulphate fertilizers on the soybean crop. Methods: The experiment was conducted in a randomized block design with four replications. The treatments were arranged in a 4 × 3 factorial scheme, with three glyphosate formulations: Roundup WG, Roundup Ultra and Glizmax, plus a weeded control. The second factor […]

Abstract: Background: Among the weed species causing the most significant losses to livestock farming is smutgrass (Sporobolus indicus), due to the high aggressiveness this weed exhibits when coexisting with pastures. Objective: To evaluate the effectiveness of mesotrione isolated and in association with FSII inhibitors herbicides in the post-emergence control of smutgrass infesting pasture cultivated with Brachiaria humidicola. Methods: The experiment was conducted in the field using a randomized complete block design, evaluating nine treatments with four replications. The treatments consisted […]

Resumen: Introducción: la resistencia de Bidens subalternans al glifosato y herbicidas inhibidores de ALS va en aumento en las regiones de producción de soja en Paraguay, por lo cual el uso de herbicidas pre-emergentes es cada vez más importante entre ellas el clomazone. Algunas formulaciones como las microencapsuladas pueden reducir el inconveniente de la volatilización de clomazone en comparación con otras formulaciones. Objetivo: el presente trabajo tuvo como objetivo evaluar la eficacia de diferentes formulaciones de clormazone en el control […]

The herbicides inhibitors ofthe enzyme EPSPs, glyphosate and sulfosate, are among the most used compounds in Brazil and in the world. The objectives ofthis review are to synthesize the information about the weeds controlled, physic-chemical characteristics, fundamentais of absorption, translocation, decomposition, mechanism of action, environmental performance, and plant resistance to the EPSPs inhibitors. With this review, we want to provide to the agricultural community information to obtain a more rational, efficient and economical performance ofthese compounds.

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 […]

Sourgrass (Digitaria insularis) is a perennial weed which has the ability to germinate, grow and develop during the entire year under Brazilian weather conditions. Once established with the formation of rhizomes, the difficulty of control greatly increases. With the recent confirmation of the existence of resistant biotypes to glyphosate, the problems became worse and knowledge on the biology of this species is critical to develop strategies for chemical management of sourgrass. The presence of this species should be monitored during […]

The present review aimed to collect information from main studies about carryover effect of some herbicides in different crops. Therefore, some relevant subjects were discussed to better understand herbicide dynamics in soil such as the ionization equilibrium constant (pKa/pKb), octanol/water partition coefficient (Kow), solubility, vapor pressure, Henry’s constant (H), half-life and the interaction among these properties. From these points, it was developed the review about the residual effects of several herbicides such as imazaquin, imazethapyr, sulfentrazone, nicosulfuron, fomesafen and other, […]

Herbicides alternatives for controlling sourgrass (Digitaria insularis) weed in infested citrus areas are limited, mainly due to the few options of registered herbicides and by the modalities in that these chemical products are used (directed applications). Thus it is important to evaluate other post-emergence herbicides, to be used in association with glyphosate, for the efficient control of glyphosate-resistant biotype of sourgrass (Digitaria insularis), resistant to glyphosate.  The experiment was conducted in Matão County, Sao Paulo State, in area belonging to […]

The sourgrass (Digitaria insularis) characteristics of aggressiveness and the existence of glyphosate resistant biotypes puts this weed in evidence in the Brazilian agricultural scenario In this regard, the present study aimed at the development and evaluation of strategies for the management of sourgrass (Digitaria insularis) resistant to glyphosate in out-of-season corn crop. The use of paraquat in pre-harvest burn-down of soybean followed by the application of clethodim two days after harvesting soybeans provided flexibility to choose the herbicide used as […]

An experiment was carried-out with the objective of evaluating the selectivity and efficacy of herbicides applied for weed control on winter cereals. The experiment was conducted under field conditions at the field station of Embrapa, in Passo Fundo, RS, during the 2005 growing season. The soil of the station is a loam Oxisol. The evaluated crops were wheat, barley, rye and triticale. Black oats, oats, turnipseed and vetch were sown in order to act as volunteer crops interfering with those […]

With the release of genetically modified organisms for tolerance of the non-selective herbicide ammonium-glufosinate in Brazil, along with its importance as an alternative herbicide to glyphosate-resistant weed, the knowledge of certain aspects related to its mode of action, chemical features and rational management become necessary. In this context, the present literature review was idealized in an attempt to cover, in the light of the current knowledge, some concepts about the biochemistry related to the mode of action of this herbicide, […]

Some herbicides frequently used in economical main crops, such as soybean, cause oxidative stress in aerobical organisms, characterized by formation of oxygen reactive species, like superoxide radicals. Superoxide dismutase (SOD) is an enzyme that plays important role in response to oxidative stress in plants, by acting over superoxide radical, forming hydrogen peroxide and molecular oxygen. The aim of this research was to determine the activity of SOD in order to verify your action to protect soybean plants protection against oxidative […]

This study aimed to quantify the levels of fiber, cellulose and lignin in Brachiaria decumbent dossel, submitted to different doses of glyphosate. The experiment was carried out in a pasture area containing Brachiaria decumbens at Fazenda Experimental Lageado, FCA/UNESP, Botucatu County, São Paulo State. Treatments consisted of five glyphosate doses (36, 72, 180, 360 and 720 g ha-1) and an untreated control, by using a randomized complete block design with four replications. For herbicide application, a backpack sprayer pressurized by […]