The use of cover crops with potential to reduce the development of weeds in crops may represent an important tool in an integrated weed management. To do so, work to evaluate initial development of Digitaria insularis under cover crops residues on the soil surface was conducted in the 2014/2015 crop in a greenhouse. The experimental design was in randomized blocks in a (7×4) + 1 factorial arrangement, and the factors consisted in seven species of cover crops (Pennisetum glaucum, Crotalaria […]

Because of its intrinsic characteristics, sicklepod (Senna obtusifolia) has gained importance in sugarcane, especially where there is a predominance of straw after mechanical harvest. The objective of this study was to evaluate the efficacy of preemergence herbicides used in sugarcane to control sicklepod in different soil textures and application timings. Two experiments were carried out for each application season (dry and wet), and one experiment for each soil textural class (clay and sandy clay loam), totaling four experiments. The treatments […]

Benghal dayflower (Commelina benghalensis L.) is a weed plant that easily infests agricultural areas due to its aggressive characteristics associated with reproductive aspects of the species. One important aspect of this plant is presenting its tolerance to the glyphosate. An experiment in greenhouse was conducted to verify the effects of different formulations and commercial products of glyphosate in controlling benghal dayflower. The experimental design was completely randomized, with four replications. The plants were grown in pots filled with eight liters […]

The weed management in soybean cultures stands out as an important tool to ensure its high yield potential. The direct tillage advent increased the importance of management performed in the soybean off season and pre-seeding, in order to avoid the weeds interference in the initial cultivation period. The survey was conducted in order to evaluate the weeds control and the agronomic performance of conventional soybean, using different desiccant herbicides. The experiment was conducted in randomized blocks design with four replications. […]

Ryegrass is an important weed in maize crops and winter cereals. The emergence of glyphosate-resistant biotypes, the main herbicide used in the Brazilian agricultural system, and the ability of natural reseeding, have raised the need to seek alternatives to minimize seed bank replenishment of this species. The objective of this study was to evaluate the effect of herbicide application at different growth stages of glyphosate-sensitive ryegrass plants on the viability of seeds from these plants. To this end, ryegrass plants […]

With the introduction in national agriculture of corn hybrids resistant to glyphosate herbicide, weed management, especially grasses, it was favored. However, volunteer maize plants coming from grains lost in mechanized harvesting can cause significant losses in crops subsequently sown, which has often been soybeans. Thus, the aim of this study was to evaluate the effect of different herbicides in controlling volunteer maize plants resistant to glyphosate herbicide. The experiment was conducted in the Brazilian municipality of Nova Xavantina, MT, between […]

The increasing use of glyphosate in Brazil has increased the selection pressure on species of weeds tolerant and resistant to this herbicide. This study aimed to evaluate the influence of glyphosate use pattern in the population dynamics of weeds in soybeans in thirty-five sampling areas of different properties. These areas were classified as to the number of applications and equivalent amount of glyphosate acid. We used the square-inventory method in thirty-five sampling areas in the 2012/2013 harvest. The structural parameters […]

To maintain the quality of the cotton fiber, as well as to provide great yields on the harvest, some aspects must be taken into account such as the uniformity of the bolls and the defoliation; therefore, the use of herbicides and maturators become indispensable. Thus, the objective of this paper was to evaluate the efficiency of the prohexadione-calcium regarding its isolate application and in association with other products in the uniformity and opening of the cotton bolls, as well as […]

Orchidaceae species are produced on a large scale for commercialization of its flowers. However, because of its slow development, the substrate is subject to weed infestation, such as brilhantina (Pilea microphylla). Thus, we aimed to evaluate the selectivity of herbicides to the orchid seedlings of genre Rhynchostylis ([Rhynchostylis gigantea Alba x Rhynchostylis gigantea] X Rhynchostylis gigantea Semi-Alba) and control of P. microphylla. A completely randomized design with four replicates per treatment was adopted. The herbicides studied were oxyfluorfen (0, 120, […]

Talinum paniculatum is a species of the Portulacacea family, popularly known as “maria-gorda”, weed in crops such as sugarcane, common bean, soybean, corn and carrot, as well as in non-agricultural areas. This work aimed to study the efficacy of herbicides in the control of T. paniculatum, as well as its effect on fresh and dry mass of these plants in three stages of development. The experimental design was completely randomized, with nine treatments and four replications, positioned in three stages: […]