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-Aminocyclopyrachlor and indaziflam are under development in Brazil and there is no information about their behavior in Brazilian soils. This study aimed to evaluate the sensitivity of plant species to these new molecules, trying to select plants that can be used as bioindicators for testing the behavior of these herbicides in the soil. Two experiments were conducted, one for each herbicide. The treatments were arranged in a 8 x 6 factorial design, the factors being represented by eight species used as bioindicators -cotton, maize, soybean, sorghum, sunflower, millet, cucumber and beet, and six doses of herbicides (aminocyclopyrachlor -0, 10 , 20, 30 , 40 and 50 g ha ). Among the species studied, soybean and beet were quite sensitive to the two new herbicide molecules, being great alternatives for bioassays in order to detect low concentrations of aminocyclopyrachlor and indaziflam in the soil.Keywords: beet, bioassay, I 50 , soybean. -algodão, milho, soja, sorgo, girassol, milheto, pepino e beterraba e seis doses dos herbicidas (aminocyclopyrachlor -0; 10; 20; 30; 40 RESUMO -O aminocyclopyrachlor e indaziflam encontram-se em fase de desenvolvimento no Brasil e não existem informações a respeito do comportamento destes em solos brasileiros. Este trabalho teve como objetivo avaliar a sensibilidade de espécies vegetais à estas novas moléculas, buscando selecionar plantas que possam ser utilizadas como bioindicadores em ensaios de comportamento destes herbicidas no solo. Foram conduzidos dois experimentos um para cada herbicida. Os tratamentos foram dispostos em esquema fatorial 8 x 6, sendo os fatores representados por oito espécies utilizadas como bioindicadoras

RESUMO -Objetivou-se neste estudo avaliar a tensão superficial estática, o pH e a produção da espuma de misturas em tanque de glyphosate + chlorimuron-ethyl, associadas ou não com adjuvantes. Dois trabalhos foram realizados, sendo a primeira etapa desenvolvida em delineamento inteiramente casualizado com seis tratamentos e 20 repetições, representados por soluções dos herbicidas glyphosate (540,0 g e.a. ha ) e chlorimuron-ethyl (7,5 g ha ABSTRACT -This work aimed to evaluate static superficial tension, pH and foam production in glyphosate + chlorimuron-ethyl tank mixtures with or without adjuvants. The experiment consisted of two stages, with the first stage being arranged in a complete randomized design, with six treatments and 20 replications, represented by glyphosate (540.0 g a.e. ha -1 ) and chlorimuron-ethyl (7.5 g ha -1 ) solutions, isolated and in tank mixtures in the following formulations: Polaris TM , Roundup Ready TM , Classic TM , Polaris TM + Classic TM , Roundup Ready TM + Classic TM and check (water). The second stage was also arranged in a complete randomized design, with 70 treatments and 20 replications, in a 2 x 5 x 7 factorial scheme constituted by two mixtures of glyphosate with chlorimuron-ethyl (Polaris TM + Classic TM and Roundup Ready TM + Classic TM ), 5 adjuvants (Joint Oil TM , Nimbus TM , Assist TM , Natur' Oil TM and Agr' Óleo TM ) and 7 adjuvant doses (0.000; 0.031; 0.062; 0.125; 0.250; 0.500 and 1.000% of v/v). Polaris TM and Roundup Ready TM solutions , isolated or in tank mixtures with Classic TM , characterized by static superficial tensions of 43.2 and 35.9 mN m -1 and medium

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RESUMO -Conyza bonariensis é uma das principais plantas daninhas da região Sul do País; com a seleção de biótipos tolerantes e resistentes ao herbicida glyphosate, demandas são crescentes por alternativas de manejo para essa espécie. Com esse intuito, o objetivo do presente trabalho foi avaliar a eficiência de diferentes estratégias de manejo de inverno e de verão sobre o controle de Conyza bonariensis, utilizando a mistura em tanque de glyphosate+2,4-D associada ou não com herbicidas residuais. As combinações de manejo foram realizadas após a colheita do milho safrinha (manejo de inverno), associadas a manejos antecedendo a semeadura da soja (manejo de verão), totalizando 15 tratamentos. Os manejos de inverno avaliados foram eficientes na dessecação das plantas daninhas e mantiveram excelentes níveis de controle residual até a pré-semeadura da cultura da soja. A semeadura da aveia após o manejo de inverno com posterior manejo de verão com glyphosate+2,4-D+diclosulam mostrou-se eficiente no controle de Bidens pilosa. Em todos os manejos em que o herbicida 2,4-D foi associado ao glyphosate houve controle total de Conyza bonariensis.Palavras-chave: buva, manejo entressafra, 2,4-D, resistência.ABSTRACT -Conyza bonariensis is one of the most important weeds in southern Brazil. The selection of biotypes tolerant and resistant to the herbicide glyphosate has led to increasing demand for alternatives of management strategy to control this species. This work aimed to evaluate the efficiency of different winter and summer management strategy for the control of Conyza bonariensis, by using glyphosate + 2,4-D tank mixtures combined or not with residual herbicides. The different burndown alternatives were applied after corn harvest (winter burndown), associated to applications before soybean sowing (summer burndown) with a total of 15 treatments. Winter burndown options evaluated in this research were efficient in weed desiccation and provided excellent levels of residual weed control up to the next summer soybean pre-sowing. The sowing of oats after winter burndown with subsequent summer burndown with glyphosate+diclosulam + 2,4-D was found to be efficient to control Bidens pilosa. Conyza bonariensis was totally controlled in all the burndown strategies in which the herbicide 2,4-D was associated to glyphosate.