The specie Cyperus rotundus is among the weeds most difficult to control and can cause high losses in the sugarcane crop. The practices adopted in the culture guarantee the values of yield, among them, is the weed management. The objective of this work was to evaluate the initial growth of sugarcane pre-sprouted seedlings submitted to herbicide application before or after planting. Two experiments (pre and post-planting) were conducted in greenhouse, in a completely randomized design, with four replications. The treatments […]

Weed management in onion culture is a fundamental practice to reduce or eliminate interference from weeds community, since the crop, especially in direct sowing system, presents slow initial growth and low competitive capacity. In this sense, for the correct use of the herbicides it is necessary to know the effects provided by the doses in the onion crop as well as to quantify this effect for the different phenological stages. In view of the above, the purpose of this study […]

The productive increase of the maize crop can be maximized by crop densification and, for this, the use of herbicides and growth regulators, because it favors the reduction of plant size, becomes an important tool. Thus, the objective of this study was to evaluate the rates of growth reducers on the phytometric performance of maize simple hybrids. The design was completely randomized, in a 2 x 5 factorial scheme, with four replications. Growth factors (trinexapac-ethyl and clomazone) were considered as […]

Black bean is one of the main grains grown in Brazil, with economic, social and cultural importance. Grain productivity losses due to competition with weeds, in particular Digitaria ciliaris (summergrass) and Urochloa plantaginea (signalgrass) can reach levels of up to 80% if neither Control is adopted. The objective of this study was to evaluate the efficacy and selectivity of herbicides applied in pre and post emergence of black beans. The experimental design was a randomized block design, with four replications. […]

The main weeds in wheat are wild radish and ryegrass, and its post-emergence control is based on herbicides inhibiting the enzyme acetolactate synthase (ALS) and acetyl coenzyme A carboxase (ACCase), which as a function of resistance limits the control options. Herbicide combinations have been used for post-emergence of wheat; however, the effects of herbicidal combinations are poorly understood. The objective of this work was to evaluate the selectivity of wheat to herbicide associations and rates applied in post-emergence. Three field […]

The solar radiation reduction incident on the terrestrial surface can changes the vegetal behavior and the herbicide selectivity. The aim of this work was to evaluate the herbicide selectivity bentazon, iodosulfuron-methyl-sodium and grain yield of wheat under conditions of reduction of luminosity in different phenological stages of the crop. Two experiments were conducted, the first (I) under controlled conditions and the second (II) in field. In both experiments, wheat was evaluated according to the herbicide application (bentazone, 900 g ha-1 […]

The cultivation of safflower has increased in recent years, mainly for the production of biodiesel. However, it is necessary to weed control in order to avoid losses in productivity. In this way, an alternative that comes up is the use of selective herbicides for culture. This study aimed to verify the selectivity of different herbicides in pre and post-emergence to the safflower crop. Two experiments were conducted adopting a randomized block design with four replicates. For the first experiment with […]

Auxins IAA (indole-3-acetic acid), 2,4-D (2,4-dichlorophenoxyacetic acid) and 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) were applied on maize (Zea mays, monocot) and bean (Phaseolus vulgaris, dicot) plants, with the goal to understand the mechanisms that lead to different responses in relation to the metabolism of ethylene. Maize plants treated with auxins did not produce ethylene, whereas beans produced a lot of it after the treatment. After being sprayed with auxins, maize did not produced any 1-Aminocyclopropane-1-carboxylic acid (ACC), which was observed on beans. […]

The chemical control of weeds is an important management to keep high productivity in the wheat crop. Due to the scarceness of registered products for the crop, the goal of this work was to evaluate the selectivity of the flumioxazin herbicide to wheat, applied in post-emergence. The experiment was conducted on the field and the used experimental design was the randomized block one, with four replications. The treatments were applied on stage V3 of the wheat crop and consisted in […]

In order to bypass cases of glyphosate-resistant weeds, it becomes necessary to use herbicides with other action mechanisms. The goal of this work was to evaluate the effectiveness and selectivity of herbicides with isolated or tank mix application for the management of soybean-infesting glyphosate-resistant weeds. Treatments were applied sequentially, during pre-emergence: clomazone (900 g ha-1 a.i.); flumioxazin (50 g ha-1 a.i.); diclosulam (35.02 g ha-1 a.i.); s-metolachlor (1152 g ha-1 a.i.); sulfometuron + chlorimuron-ethyl (18.75 + 18.75 g ha-1 a.i.); […]