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The effects of soil fumigation on the growth and mineral nutrition of weeds and crops - doi: 10.4025/actasciagron.v34i2.12971 Agronomy
Santos, Edson Aparecido dos; Universidade Estadual Paulista; Ferreira, Lino Roberto; Universidade Federal de Viçosa; Costa, Mauricio Dutra; Universidade Federal de Viçosa; Santos, José Barbosa dos; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Silva, Marliane de Cássia Soares da; Universidade Federal de Viçosa; Aspiazú, Ignacio; Universidade Estadual de Montes Claros.
Weeds and soil microorganisms interact with each other in the soil/root interface, promoting the development and establishment of both. The objective of this study was to evaluate the growth and nutrient accumulation in eight species of weeds (Ageratum conyzoides L., Bidens pilosa L., Cenchrus echinatus L., Conyza bonariensis L., Echinochloa crus-galli L., Eleusine indica L. Ipomoea grandifolia L. and Lolium multiflorum L.) and in bean and corn crops grown for 50 days in a substrate fumigated with methyl bromide. Assessments relating to the height, leaf area, leaf number, dry weight of shoots and roots and relative content of nutrients were carried out 50 days after seedling emergence. A positive effect of soil fumigation was observed on the growth, leaf...
Palavras-chave: 5.00.00.00-4; 5.01.03.00-8 rhizosphere; Soil microorganisms; Conyza bonariensis; Methyl bromide Matologia.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/12971
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Growth, phenology, and seed viability between glyphosate-resistant and glyphosate-susceptible hary fleabane Bragantia
Kaspary,Tiago Edu; Lamego,Fabiane Pinto; Cutti,Luan; Aguiar,Adalin Cezar de Morais; Rigon,Carlos Alberto Gonsiorkiewicz; Basso,Claudir José.
ABSTRACT Glyphosate is the herbicide most used worldwide. In cropping systems that rely on repeated applications of glyphosate or cultivate genetically modified soyabean crop, there are numerous cases of glyphosate resistant weeds, including Conyza bonariensis. Differences among competitive ability of Conyza spp. have been found. However, little information is available on the fitness costs related to glyphosate resistance in Conyza bonariensis. We evaluated growth, phenology, and seed viability of glyphosate-resistant (GR) and glyphosate-susceptible (GS) Conyza bonariensis from Brazil, in 2012 (fall/winter) and 2013 (spring/summer). When grown alone, in pots, C. bonariensis GR biotype developed more rapidly than the GS biotype, as evidenced by their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Plant height; Dry weight; Leaf area; Seed set.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000100092
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Oxidative stress and differential antioxidant enzyme activity in glyphosate-resistant and -sensitive hairy fleabane in response to glyphosate treatment Bragantia
Piasecki,Cristiano; Carvalho,Ivan Ricardo; Cechin,Joanei; Goulart,Francisco A. P; Maia,Luciano Carlos da; Agostinetto,Dirceu; Caverzan,Andréia; Stewart Jr.,C. Neal; Vargas,Leandro.
ABSTRACT Biochemical assays in a time-course were employed to evaluate stresses induced by glyphosate treatment in resistant and sensitive biotypes of Conyza bonariensis. Two experiments were conducted assessing glyphosate doses and time-course after treatment. The doses of glyphosate ranged from 0 to 11840 g ae·ha–1 and assessments performed until 552 h after glyphosate treatment (HAT). The objectives of this study were to evaluate the oxidative stress and differential antioxidant enzyme activity in glyphosate-resistant and -sensitive biotypes of hairy fleabane after glyphosate treatment. After treatment, both studied biotypes accumulated similar levels of shikimic-acid until 96 h. The sensitive biotype died at192 HAT. Shikimic-acid and hydrogen peroxide...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Lipid peroxidation; Shikimic-acid; Herbicide resistance.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300379
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Morphological analysis and DNA methylation in Conyza bonariensis L. cronquist (Asteraceae) phenotypes Bragantia
Paula,Juliana Maria de; Pinto-Maglio,Cecília Alzira Ferreira; Pinto,Luciana Rossini.
ABSTRACT The species Conyza bonariensis (L.) cause losses in agriculture due to their invasive capacity and resistance to herbicides like glyphosate. The species of this genus exhibit phenotypic plasticity, which complicates their identification and characterization. Thus, experiments were performed with 2 extreme C. bonariensis phenotypes (called broad leaf and narrow leaf) in greenhouse conditions and in the laboratory, in order to verify if the morphological differences among these phenotypes are a genetic character or result from environmental effects. In addition to the comparative morphological analysis, assessment of DNA methylation profile was performed to detect the occurrence, or not, of differences in the epigenetic level. The morphological...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phenotypic plasticity; Conyza bonariensis; Resistance; Weeds.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400480
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Clotting and fibrinogenolysis inhibition by essential oils from species of the Asteraceae family BABT
Miranda,Cíntia Alvarenga Santos Fraga de; Cardoso,Maria das Graças; Marcussi,Silvana; Teixeira,Maria Luisa.
ABSTRACT Essential oils are pharmacologically active and unexplored compounds. The inhibitory properties of essential oils from Baccharis dracunculifolia, Conyza bonariensis, Tithonia diversifolia and Ambrosia polystachya were evaluated in the coagulation and fibrinogenolysis induced by snake venoms. The essential oil from Conyza bonariensis extended the clotting time of Lachesis muta from 52.2 to 115.2 seconds and that of Bothrops moojeni from 108.3 to 2340.0 seconds, when pre-incubated with the venoms. The longest clotting times for Bothrops atrox venom were observed after incubation with the essential oils from Conyza bonariensis and Tithonia diversifolia: the times increased from 100.8 to 264.0 and 227.7 seconds, respectively. The prior incubation of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Proteases inhibitors; Baccharis dracunculifolia; Conyza bonariensis; Tithonia diversifolia; Ambrosia polystachya..
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100327
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Control of glyphosate resistant hairy fleabane (Conyza bonariensis) with dicamba and 2,4-D Planta Daninha
Soares,D.J.; Oliveira,W.S.; López-Ovejero,R.F.; Christoffoleti,P.J.
Auxyn type herbicides such as dicamba and 2,4-D are alternative herbicides that can be used to control glyphosate-resistant hairy fleabane. With the forthcoming possibility of releasing dicamba-resistant and 2,4-D-resistant crops, use of these growth regulator herbicides will likely be an alternative that can be applied to the control of glyphosate resistant hairy fleabane (Conyza bonariensis). The objective of this research was to model the efficacy, through dose-response curves, of glyphosate, 2,4-D, isolated dicamba and glyphosatedicamba combinations to control a brazilian hairy fleabane population resistant to glyphosate. The greenhouse dose-response studies were conducted as a completely randomized experimental design, and the rates used for dose...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Dose-response; Glyphosate-resistant hairy fleabane; Weed resistance.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200020
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Glyphosate Applied at the Early Reproductive Stage Impairs Seed Production of Glyphosate-Resistant Hairy Fleabane Planta Daninha
PIASECKI,C.; MAZON,A.S.; MONGE,A.; CAVALCANTE,J.A.; AGOSTINETTO,D.; VARGAS,L..
ABSTRACT: Glyphosate-resistant hairy fleabane [Conyza bonariensis (L.) Cronq.] is one of the most important weeds in the world. Among the factors that make this weed species widely distributed in the most diverse environments is the high seed production capacity and dispersal. Hairy fleabane plants not controlled by herbicide application regrowth and overcome crop canopy, use environmental resources, interfere with crops, and complete their life cycle by producing thousands of seeds and replenishing the seed bank. Management strategies that reduce production and viability of hairy fleabane seeds can be adopted within the integrated management to reduce the seed bank and prevent further infestations. In this way, experiments were carried out in a greenhouse...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Resistance; Integrated weed management; Prevention; Soil seed bank.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100198
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Occurrence of Horseweed Biotypes with Low Susceptibility to Glyphosate in the States of Rio Grande do Sul, Paraná and Mato Grosso do Sul, Brazil Planta Daninha
RIZZARDI,M.A.; SCHNEIDER,T.; BIANCHI,M.A.; ROCKENBACH,A.P..
ABSTRACT: Horseweed is an annual cycle weed naturally controlled by the herbicide glyphosate. However, the continued use of this product has selected tolerant and resistant populations. The objective of this study is to analyze the occurrence of horseweed biotypes with a low glyphosate susceptibility in the states of Rio Grande do Sul, Paraná and Mato Grosso do Sul. Seeds of horseweed plants (Conyzaspp.) that survived glyphosate applications were collected in RR soybean crops, totaling 137 samples from 37 municipalities. The seeds of the biotypes were sown, and the plants originated from them, when they reached the stage of four to six leaves, were subjected to a treatment with 1,440ga.e.ha-1 of glyphosate. According to the results, 108biotypes were not...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Conyza sumatrensis; Conyza canadensis; Resistance; Chemical control.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100290
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MOLECULAR CHARACTERIZATION OF HAIRY FLEABANE USING RAPD Planta Daninha
SILVA,D.R.O.; AGOSTINETTO,D.; VARGAS,L..
ABSTRACT With the increase of glyphosate resistance evolution in hairy fleabane, the knowledge of genetic diversity is essential to assist in the weed management. The objective was to characterize the genetic diversity of glyphosate resistant Conyza species in Rio Grande do Sul. Hairy fleabane biotype seeds were collected in fields of glyphosate-resistant soybean, generating seedlings used for extracting DNA from the leaves to perform a genetic diversity analysis, using the RAPD technique. The DNA was used in polymerase chain reaction and DNA fragments were assessed for polymorphism bands in electrophoresis. Biotypes were identified as Conyza bonariensis and microcephala varieties. In molecular analysis, among 25 primers RAPD, eight were reproducible...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Polymorphism; Glyphosate; PCR.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300433
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Shikimate accumulation, glyphosate absorption and translocation in horseweed biotypes Planta Daninha
CARDINALI,V.C.B.; DIAS,A.C.R.; MUELLER,T.C.; ABERCROMBIE,L.; STEWART JR.,C.N.; TORNISIELO,V.L.; CHRISTOFFOLETI,P.J..
In Brazil, few research works on mechanisms of weed resistance to glyphosate have been conducted so far. Therefore, this research aimed to study analytical procedures determining the relation between the concentration of plant shikimate after glyphosate application and the plant resistance to this herbicide; and evaluate the glyphosate absorption and translocation into two resistant ® and susceptible (S) horseweed biotypes to glyphosate. Horseweed plants with nine true leaves received glyphosate (720 g a.e. ha-1), and 2, 3, 4, 7 and 10 days after application (DAA) the concentration of shikimic acid was measured by HPLC. In another experiment, plants were treated with radiolabeled glyphosate (14C) (1.456 MBq mmol-1 specific activity) and radioactivity was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; High Performance Liquid Chromatography; EPSPS; Selection; Radioactivity.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100109
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Manejo de plantas daninhas eudicotiledôneas na cultura da soja Roundup Ready Planta Daninha
Rizzardi,M.A.; Silva,L..
As espécies eudicotiledôneas sempre foram um desafio no manejo de plantas daninhas na cultura da soja. Essa dificuldade foi aumentada pelo surgimento de plantas de difícil controle com os herbicidas atualmente existentes no mercado. Diante disso, o objetivo deste trabalho foi o de buscar alternativas de manejo que diminuam a pressão de seleção devido ao uso contínuo de glifosato na soja Roundup Ready®. O trabalho foi implantado no delineamento em blocos casualizados, em esquema de parcelas sub-subdivididas, com quatro repetições. Foram avaliadas cinco coberturas de inverno (parcelas), seis manejos químicos em pré-semeadura da soja (subparcelas) e três manejos químicos em pós-emergência da soja (sub-subparcelas). Nenhum dos tratamentos avaliados mostrou...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Culturas de cobertura; Herbicidas; Euphorbia heterophylla; Conyza bonariensis.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000400003
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INVESTIGATION OF THE MECHANISM OF RESISTANCE TO GLYPHOSATE HERBICIDE IN HAIRY FLEABANE Planta Daninha
KASPARY,T.E.; LAMEGO,F.P.; LANGARO,A.C.; RUCHEL,Q.; AGOSTINETTO,D..
ABSTRACT The resistance of weeds to herbicides is a consequence of one or more mechanisms in the plant, responsible for not allowing the herbicide to act properly at the active site. The objective of this study was to investigate the mechanism(s) of resistance to glyphosate in Conyza bonariensis. An experiment was conducted in November and December, 2012 and repeated in February and March, 2013 using a factorial arrangement of the treatments, where the factor A corresponded to biotypes of hairy fleabane, susceptible (S) and resistant (R); the factor B to seven rates of glyphosate from 0 to 11,520 g e.a. ha-1, and factor C were simulated environmental conditions of winter (12/8 oC day/night of temperature and 10/14 h of photoperiod) and summer (28/20 oC...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Temperature; Photoperiod; EPSPs.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300555
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HAIRY FLEABANE AS A SOURCE OF MAJOR INSECT PESTS OF SOYBEAN Planta Daninha
DALAZEN,G.; CURIOLETTI,L.E.; CAGLIARI,D.; STACKE,R.F.; GUEDES,J.V.C..
ABSTRACT Weeds compete with crops for essential inputs, but they are also important hosts for pests, both during the crop and between crops. Hairy fleabane (Conyza bonariensis) is an important weed growing in both summer and winter crops. The aim of this study was to evaluate the occurrence and population fluctuations of soybean pests using hairy fleabane as an alternative host. Samples of hairy fleabane plants were collected fortnightly over twelve months at two sites (Boa Vista do Incra and São Vicente do Sul) in Rio Grande do Sul state, Brazil. The results showed that hairy fleabane plants provided shelter to important soybean pests, including the pentatomid stink bugs Edessa meditabunda, Piezodorus guildinii, Dichelop sp. and Euschistus heros,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soybean pests; Integrated pest management; Weeds; Conyza bonariensis.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300403
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Determination of photosynthetic pigments in fleabane biotypes susceptible and resistant to the Herbicide Glyphosate Planta Daninha
Kaspary,T.E.; Lamego,F.P.; Cutti,L.; Aguiar,A.C.M.; Bellé,C..
Chlorophylls and carotenoids are the main photosynthetic pigment in plants. In the weeds, the greatest amount of photosynthetic pigments can result in high competitiveness of the species. The aim of this study was to quantify the content of photosynthetic pigments in biotypes of fleabane (Conyza bonariensis) susceptible and resistant to glyphosate, by two different methods, as well as a correlation between chlorophyll content obtained by portable and classical methodology (extractable chlorophyll). An experiment was conducted in greenhouse and laboratory, 2 x 5 factorial scheme, where factor A was equivalent to biotypes of fleabane (resistant and susceptible to glyphosate) and factor B to developmental stages plants (rosette vegetative I, II and III and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Chlorophyll; Carotenoids; Resistance.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200020
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Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity Planta Daninha
SILVA,D.R.O.; VARGAS,L.; AGOSTINETTO,D.; SANTOS,F.M..
ABSTRACT: Herbicide resistance can confer lower competitive abilities; however scarse information is available about the photosynthetic performance between glyphosate-resistant and -susceptible hairy fleabane biotypes coming from areas with similar weed management history. Thus, the goal was to evaluate the photosynthetic performance under different light intensities between glyphosate-resistant and -susceptible hairy fleabane biotypes, from RR soybean fields with a similar weed management history. The tested factors were glyphosate resistant and susceptible biotypes and 12 levels of photosynthetic photon flux density. Plants were cultivated in plastic cups, and at the stage of 10-12 leaves they were subjected to treatments with artificial lighting...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Ecological adaptability; Photosynthetic photon flux; Carbon assimilation rate; Gas exchange; Light response curve.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100285
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SPECTRUM OF WEED CONTROL WITH 2,4-D AND DICAMBA HERBICIDES ASSOCIATED TO GLYPHOSATE OR NOT Planta Daninha
OSIPE,J.B.; OLIVEIRA JR.,R.S.; CONSTANTIN,J.; TAKANO,H.K.; BIFFE,D.F..
ABSTRACT The possibility of using auxin mimics herbicides in culture postemergence applications contributes to weed management. This study aimed at evaluating and comparing the effectiveness of 2,4-D and dicamba herbicides on glyphosate resistant or tolerant weeds. The treatments were dicamba and 2,4-D doses with or without glyphosate. The evaluated weeds in the experiment were Richardia brasiliensis, Commelina benghalensis, Conyza sp. and Ipomoea nil. Herbicides were applied when weeds were in 4 to 6 and 10 to 12 leaves stages. Data referring to evaluations on day 30 after application were submitted to analysis of variance. Response-dose curves were obtained for herbicides, and C85 and C95 values were identified. Weed species showed different tolerance to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mimics auxin; Weeds; Richardia brasiliensis; Commelina benghalensis; Conyza bonariensis; Ipomoea nil.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100251
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Herbicidas de uso potencial no controle de buva e sua seletividade sobre aveia e azevém Rev. Ciênc. Agron.
Dalazen,Giliardi; Kruse,Nelson Diehl; Machado,Sérgio Luiz de Oliveira.
RESUMOA rotação de herbicidas é o principal método de prevenção e manejo da resistência de plantas daninhas a herbicidas. Porém, além de eficientes, os herbicidas devem ser seletivos às culturas. Objetivou-se com este trabalho avaliar a seletividade de herbicidas de uso potencial para o controle de buva sobre aveia branca, aveia comum, azevém comum e azevém tetraploide. Os experimentos foram organizados em blocos ao acaso, em esquema bifatorial, onde o fator A foi formado por herbicidas e o fator B pelas doses X e 2X dos herbicidas, em que a dose X corresponde à dose indicada de ingrediente ativo (i.a.). Os tratamentos avaliados foram: 2,4-D amina (806 e 1612 g i.a. ha-1); metsulfuron-methyl (2,4 e 4,8 g i.a. ha-1); chlorimuron-ethyl (20 e 40 g i.a. ha-1);...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conyza bonariensis; Resistência de plantas daninhas; Pastagem de inverno; Lolium multiflorum; Avena spp.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000400792
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Efecto antiinflamatorio y antimicótico del extracto alcohólico y composición química del aceite de hojas de Conyza bonariensis (L.) Cronquist (canilla de venado) Plantas Medicinales
Manzano Santana,Patricia; Miranda,Migdalia; Gutiérrez,Yamilet; García,Gastón; Orellana,Tulio; Orellana-Manzano,Andrea.
Introducción: la especie Conyza bonariensis (L.) Cronquist, comúnmente llamada canilla de venado, es de origen americano. Objetivos: contribuir al estudio farmacológico y toxicológico de los extractos alcohólicos y a la evaluación química del aceite de hojas de C. bonariensis de Ecuador. Métodos: se emplearon 2 tinturas a 50 % con etanol a 70 y 90 % de hojas secas. Se realizó un estudio fitoquímico a través del sistema acoplado de cromatografía gaseosa-espectrometría de masas, se determinó el efecto antimicótico mediante inhibición de dilución en placa con siembra en superficie por diseminación, y antiinflamatorio en el modelo de edema de la oreja inducido por aceite de Croton en ratones albinos de la línea OF1. Resultados: el tamizaje fitoquímico mostró...
Tipo: Journal article Palavras-chave: Conyza bonariensis; Trans-b-farneseno; Sesquiterpenos; Antiinflamatorio.
Ano: 2011 URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962011000100002
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Estudio de las asociaciones áfidos-entomófagos sobre Foeniculum vulgare (Umbelliferae) y Conyza bonariensis (Asteraceae) en la región central de Santa Fe, Argentina Rev. Soc. Entomol. Argent.
Manfrino,Romina G.; Salto,César E.; Zumoffen,Leticia.
El objetivo del presente trabajo fue estudiar las asociaciones áfidos-entomófagos en Foeniculum vulgare (Miller) y Conyza bonariensis L, a fin de implementar el Control Biológico Conservativo (CBC) en agroecosistemas de la región central de la provincia de Santa Fe. Se realizaron estudios, a campo, de la entomofauna presente mediante la observación directa de las plantas; las mismas se llevaron a cabo con una frecuencia semanal. En invernáculo, se procedió a la identificación de las especies cuando esta no fue posible a campo. La especie de áfido encontrada fue Hyadaphis foeniculi (Passerini) (Homoptera: Aphididae), colonizando a F. vulgare y se destacó Uroleucon (Lambersius) sp. (Homoptera: Aphididae) enC. bonariensis. Entre los enemigos naturales, se...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Control Biológico Conservativo; Agroecosistemas; Foeniculum vulgare; Conyza bonariensis; Santa Fe.
Ano: 2011 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802011000100010
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