Donkey-tailed grass is a poaceae, considered a recent weed in soybean crops and its increasing the infestation’s levels and the difficulty of control. Thus, this study aimed to evaluate the effectiveness of different doses of herbicides applied alone or mixed, to control dunk-grass at different stages of development. Three experiments were conducted, first one in greenhouse with new plants and two experiments in the field with clumps. The treatments were glyphosate; fluazifop; sethoxydim; fenoxaprop; clethodim; quizalofop; haloxyfop; pinoxaden, nicosulfuron; glufosinate […]

Repetitive adoption of glyphosate and in high rates have selected resistant biotypes of weeds, as well as it has contributed to selecting glyphosate-tolerant species. The most common solution for that is the inclusion of alternative herbicides in the system of production, applied isolated or in the tank mixtures. Therefore, this work was developed with the objective of evaluating the efficacy and interaction of glyphosate-saflufenacil tank mixtures for controlling two weed species. Two independent experiments were developed, evaluating one monocotyledonous weed […]

Corn is an important crop for agriculture, playing a fundamental role in animal and human feed and energy production. Therefore, the purpose of this study was evaluate the effectiveness, selectivity and effects on corn physiological and productive characteristics after herbicide application either isolated or in tank mix. The procedure adopted was randomized blocks design, with four replications each. The treatments, glyphosate, [atrazine + simazine], nicosulfuron, mesotrione, tembotrione, plus a weeded control were used alone or in a tank mixture. It […]

Recently, soybean cultivated area has risen in Brazil and so had total production. In the Rio Grande do Sul state (RS), soybean production is also increasing and its grown after beef production during the cold season, a production model that contributes to improve land usage during the twelve months of the year, increasing farmers’ income and, when well handled, it can also contribute to integrated weed management. Despite that, the presence of hard-to-control broadleaved weeds like Amaranthus hybridus in RS soybean fields […]

In part of the Midwest region of Brazil, cotton has been grown in second crop, sown after soybean harvest. In these areas, the occurrence of voluntary soybean plants has been common, interfering in the development of cotton crop. In this sense, the objective of this work was to evaluate the effectiveness of herbicides applied post-emergence in cotton for the control of voluntary soybeans containing different transgenics. Two experiments were carried out in a greenhouse, using a soybean cultivar with Liberty […]

Weed management is essential for obtaining high grain yields in irrigated rice. In this study, the objectives were to map, quantify and to evaluate resistance occurrence of weeds in irrigated rice production areas using the Clearfield® (CL) system in the state of Rio Grande do Sul (RS). For this, a phytosociological survey was carried out by means of georeferenced collections of soils in 36 farms with the cultivation of irrigated rice in 16 cities in RS. The soil samples were […]

The presence of weeds can considerably affect the culture of sugarcane, especially in the beginning of its development. Thus, the aim of this study was to evaluate the efficacy of pre-emergence herbicides amicarbazone and flumioxazim in the control of the species Merremia aegypitia, Mucuna aterrima and Ricinus communis in the raw cane system. The survey was conducted under field conditions with sandy soil covered by 10 t. ha-1 sugarcane straw. The experiment was performed in quadruplicate outlined in randomized blocks. […]

The objective of this study was to evaluate the time of exposure to diquat in the control of Egeria najas, E. densa (Planchon) and Hydrilla verticillate (L.F.) Royle, and use of a new evaluation table to analyze the effectiveness of submerged aquatic plants. For this, concentrations were used 0.2; 0.8 and 1.6 mg L-1 of diquat and a control (without herbicide application). The 10 cm plants remained exposed for 5, 15, 30, 60, 240, 480, 720 e 1440 minutos. They […]

The soil weed seed bank is very dynamic and affected by several soil, plant management factors and environmental conditions. In this study, the immediate viability of weed seed germination in floodplain cultivated with flooded rice. Three depths of soil were used: 0-10 cm, 10-20 cm and 20-40 cm. In laboratory conditions, 800g of soil from each depth in five replications were placed in 20 cm high cut pet bottles, and subsequently placed in an incubator at 25ºC with 12 hours […]

O Brasil é o terceiro maior produtor de frutas do mundo, sendo que as plantas daninhasconstituem um dos principais problemas para a exploração da capacidade de produção defrutíferas tropicais. Ainda há muitas lacunas no conhecimento do manejo adequado deplantas das plantas daninhas em cultivos de frutíferas. O objetivo desta revisão foi sumarizardados sobre a interferência, métodos de controle e manejo de plantas daninhas nas culturasdo abacaxizeiro, bananeira, coqueiro, mamoeiro e maracujazeiro. Métodos mecânicosassociados à aplicação de herbicidas nas entrelinhas de […]