-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

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.

RESUMO -O clomazone destaca-se como um dos principais herbicidas utilizados em pré-emergência na cultura do algodoeiro, mesmo levando-se em conta o fato de que muito pouco se sabe em relação à sua seletividade para a cultura. Objetivou-se com este trabalho avaliar a seletividade do clomazone isolado ou em mistura com outros herbicidas utilizados em pré-emergência na cultura do algodoeiro. O delineamento experimental foi o de blocos ao acaso, com quatro repetições, com a utilização de testemunhas duplas. Foram avaliados 13 tratamentos, os quais foram constituídos de clomazone isolado ou combinado com os herbicidas S-metolachlor, diuron, prometryne, alachlor, oxyfluorfen e trifluralin. Foram avaliados porcentagem de fitointoxicação, estande final, altura de plantas, número de maçãs e rendimento final de algodão em caroço. O clomazone, isolado nas doses de 1,00 e 1,25 kg ha -1 ou em associação com S-metolachlor (0,76 kg ha -1 ), diuron (1,50 kg ha -1 ), prometryne (1,50 kg ha -1 ), alachlor (1,44 kg ha -1 ) e trifluralin (1,80 kg ha -1 ), foi seletivo à cultura do algodão cv. Nu Opal. Em contrapartida, sua associação com oxyfluorfen (1,25 + 0,19 kg ha -1 ), trifluralin + diuron (1,25 + 1,80 + 1,50 kg ha -1 ) e trifluralin + prometryne (1,25 + 1,80 + 1,50 kg ha -1 ) proporcionou redução na produtividade do algodoeiro.Palavras-chave: Gossypium hirsutum, pré-emergência, mistura em tanque.ABSTRACT -Clomazone is one of the most important herbicides applied in pre-emergence in cotton, even though not much is known about its selectivity to this crop. This work was carried out to evaluate the selectivity of clomazone applied alone or in tank mixtures with other herbicides applied in pre-emergence in cotton. The experiment was designed as a randomized block, with four replicates, using two-fold checks. Thirteen treatments were evaluated, constituted by different combinations of clomazone with S-metolachlor, diuron, prometryne, alachlor, oxyfluorfen, and trifluralin. After herbicide application, visual crop injury was evaluated, as well as stand, plant height, number of bolls per plant and cotton+seed yield. Clomazone alone applied at 1.00 and 1.25 kg ha -1 or associated to S-metolachlor (0.76 kg ha -1 ), diuron (1.50 kg ha -1 ), prometryne (1.50 kg ha -1 ), alachlor (1.44 kg ha -1 ), and trifluralin (1.80 kg ha -1 ) was selective to cotton cv. Nu-Opal. However, its association with oxyfluorfen (1.25 + 0.19 kg ha -1 ), with trifluralin + diuron (1.25 + 1.80 + 1.50 kg ha -1 ), and with trifluralin + prometryne (1.25 + 1.80 + 1.50 kg ha -1 ) resulted in reduced cotton yield.

-The objective of this research was to confirm the resistance of a barnyardgrass biotype (Echinochloa crus-galli) to herbicides quinclorac (synthetic auxin), penoxsulam (ALS inhibitor) and cyhalofop-butyl (ACCase inhibitor). Two experiments were carried out in a greenhouse located in Itajaí, State of Santa Catarina, Brazil. One experiment evaluating the biotype ECH 18 (known as susceptible) and one with the ECH 141 biotype (suspected to be multiple resistant). The experimental design used was completely randomized, in a 4 x 7 factorial arrangement with four replications. The first factor was the herbicide: cyhalofopbutyl (Clincher ® ), penoxsulam (Ricer ® ), quinclorac (Facet ® ) and propanil (Grassaid ® ) and the second factor consisting of seven rates of each herbicide (0.00; 0.25; 0.50; 1; 2; 4 and 8 times the label rate). The evaluations of percentage of control, plant density per pot and dry mass of shoots were performed 35 days after treatments. The rates to control 50% and 80% and the dose to provide 50% and 80% of the weed biomass accumulation and the resistance factor were estimated based on data analysis. The initial hypothesis was confirmed; the biotype ECH 141 presented multiple resistance (synthetic auxin, ALS and ACCase inhibitor). However, the herbicide propanil controlled biotype ECH 141 adequate.Keywords: Paddy rice, Echinochloa crus-galli, chemical control, herbicide resistance. (0,00, 0,25, 0,50, 1,00, 2,00, 4,00 RESUMO -Este estudo teve como objetivo confirmar a resistência múltipla de um biótipo de capimarroz (Echinochloa crus-galli) aos herbicidas auxínicos (quinclorac), inibidores da ALS (penoxsulam) e ACCase (cyhalofop-butyl). Foram conduzidos dois experimentos em casa de vegetação localizada no município de Itajaí/SC: um com o biótipo ECH 18 (sabidamente suscetível) e outro com o biótipo ECH 141 (com suspeita de resistência múltipla). O delineamento experimental utilizado foi o inteiramente casualizado (DIC), organizado em arranjo fatorial 4 x 7, com quatro repetições. O primeiro fator avaliado foram os herbicidas: cyhalofop-butyl, penoxsulam, quinclorac e propanil (Clincher ® , Ricer ® , Facet ® e Grassaid ® , respectivamente). O segundo fator consistiu de sete doses de cada herbicida