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 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 […]

A field experiment was conducted in Santa Helena de Goiás to evaluate the selectivity of herbicides fomesafen and clomazone and other combinations to cotton plants when applied in preemergence. The experiment was conducted in a randomized block design in a split plot design with four replications. The assessed herbicide treatments were: clomazone, clomazone + fomesafen (0.45 kg ha-1 of a.i.), clomazone + fomesafen (0.625 kg ha-1 of a.i.), clomazone + fomesafen + diuron, clomazone + fomesafen + prometryn, clomazone + […]

In papaya culture, there is little information on selective herbicides when pre-emergence applied. A field experiment was conducted to evaluate the selectivity and efficacy of herbicides pre-emergence applied to control weeds in papaya cultivation. The experiment was conducted in a randomized blocks design with four replications. The treatments were: ametryn (1500 g ha-1 i.a.), diuron (1500 g ha-1 i.a), ametryn + diuron (1500 + 1500 g ha-1 i.a.), flumioxazin (50 g ha-1 i.a.) and isoxaflutole (150 g ha-1 i.a.), applied […]

This study has aimed to evaluate selectivity and efficiency in weed control of flumioxazin and S-metolachlor in ‘Baianinha’ cassava crops. The experimental design was randomized blocks with four replications. Treatments consisted in doses of flumioxazin of 50, 75, 100 and 125 g ha-1 a.i. and doses of S-metolachlor of 960, 1920, 2880 and 3840 g ha-1 a.i., besides weeded and unweeded controls. Treatments application was carried on 10/11/2013, 13 days after planting (DAP) and cassava cuttings presented underground sprouts measuring […]

With the introduction of transgenic soybean resistant to glyphosate, which was widespread in southern Brazil, the number of applications and the selection of biotypes of horseweed (Conyza bonariensis) resistant to herbicide have stepped up. Thus, new chemical alternatives are essential for the efficient control of horseweed. Thus, the aim of this study was to evaluate the effectiveness of cloransulam-methyl (PactoTM), applied in postemergence, in controlling C. bonariensis and SYN 1059 RR VtopTM soybean yield. The experiment was conducted in the […]

Ryegrass is an annual cycle weed, present in winter crops, orchards and vineyards of southern Brazil. The species is typically controlled by the herbicide clethodim. However, continued use of this product selected resistant biotypes. Thus, the objective of this research was to evaluate the response of ryegrass populations resistant to clethodim to the application of herbicides of different mechanisms of action, and propose chemical control alternatives. An experiment was carried out in the Brazilian city of Coqueirosdo Sul, in a […]

2,4-D is a highly toxic herbicide, neurotoxic, teratogenic, possibly carcinogenic  and well-known by its capacity of causing damages on human health and biota. This work proposes the assessment of 2,4-D toxicity levels in four Brazilian soil classes, using bioassays with earthworms (Eisenia andrei). Acute toxicity tests were performed with one sedimentary, two colluvial and one residual soils previously infected with solutions of agronomical concentration. No significant levels of mortality were observed, suggesting low acute toxicity to soil earthworms. However, the […]

From existing amino acids, twenty are directly involved in the formation of proteins. The others are known as non- proteinogenic amino acids (NPAA). The NPAA have different functions, including anti-herbivory activity, antimicrobial, protection from stress, cell signaling, nitrogen storage, as toxins against invertebrates and vertebrates and as allelochemicals. Plants are able to release these metabolites in the soil, which may influence the growth and development of neighboring plants, both positively and negatively. The objective of this review is to describe […]