Controle Químico Em Pós-Emergência De Espécies De Brachiaria Em Três Estádios Vegetativos

Marques, Renata Pereira; Rodella, Roberto Antônio; Martins, D.

doi:10.1590/1808-1657v78p4092011

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…stages (Gemelli et al 2013;Melo et al 2017). When D. insularis plants reach later developmental stages, control is hampered by the lack of herbicides with mechanisms of action that affect annual and perennial grasses (Silva et al 2018); this can occur due to the acquisition of barriers that hinder the herbicide absorption (Marques et al 2011) or by enhanced metabolism (Yu and Powles 2014). The management of D. insularis is thus compromised in the rotation of cultures that include maize.…”

Section: Methodsmentioning

confidence: 99%

“…This behavior is associated with decreased herbicide absorption due to characteristics of plant tissues and an increased action of enzymes that conjugate the herbicide (Shimabukuro et al 1970;Catâneo et al 2002). Furthermore, these traits have a higher capacity to recover from the damage caused by application (Marques et al 2011). Although nanoatrazine potentiated the control of four-leaved D. insularis plants, the efficiency was not completely satisfactory.…”

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Journal of Plant Protection Research

Sousa¹,

Pereira²,

Fraceto³

et al. 2020

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Digitaria insularis (sourgrass) is a monocotyledon weed of difficult control and high invasive behavior. Atrazine is widely applied in the Americas to control weeds in maize culture, but its efficiency against D. insularis is limited. The incorporation of atrazine into poly(epsilon-caprolactone) nanocapsules increased the herbicidal activity against susceptible weeds; however, the potential of this nanoformulation to control atrazine-tolerant weeds including D. insularis has not yet been tested. Here, we evaluated the post-emergent herbicidal activity of nanoatrazine against D. insularis plants during initial developmental stages. The study was carried out in a greenhouse, using pots filled with clay soil. Plants with two or four expanded leaves were treated with conventional or nanoencapsulated atrazine at 50 or 100% of the recommended dosage (1,000 or 2,000 g • ha −1 ), followed by the evaluation of physiological, growth, and control parameters of the plants. Compared with conventional herbicide, both dosages of nanoatrazine induced greater and faster inhibition of D. insularis photosystem II activity at both developmental stages. Atrazine nanoencapsulation also improved the control of D. insularis plants, especially in the stage with two expanded leaves. In addition, nanoatrazine led to higher decreases of dry weight of fourleaved plants than atrazine. The use of the half-dosage of nanoatrazine was equally or more efficient in affecting most of the evaluated parameters than the conventional formulation at full dosage. Overall, these results suggest that the nanoencapsulation of atrazine potentiated its post-emergent herbicidal activity against D. insularis plants at initial developmental stages, favoring the control of this atrazine-tolerant weed.

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Section: Methodsmentioning

confidence: 99%

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confidence: 98%

Journal of Plant Protection Research

Sousa¹,

Pereira²,

Fraceto³

et al. 2020

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Haloxifope-P-Metílico Para Controle De Brachiaria Decumbens Na Cultura Do Eucalipto

Assis

Cesarin

Nepomuceno

et al. 2015

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RESUMO:A cultura do eucalipto expandiu-se para a região Centro-Oeste do País, áreas onde antes havia pastagens, sobretudo de Brachiaria decumbens (capim-braquiária), passando essa a se constituir a principal planta daninha. O presente trabalho objetivou avaliar a eficácia haloxifope-p-metílico no controle de B. decumbens infestando mudas de eucalipto (Eucalyptus urograndis) e sua seletividade para a cultura. Para tanto, montouse um experimento com três situações: eucalipto plantado isoladamente, eucalipto em convivência com a espécie B. decumbens e B. decumbens plantada isoladamente. Aos 67 dias após o plantio das mudas foi feita a aplicação do haloxifope-p-metílico nas doses de 0; 48 e 96 g . i . a . ha ), proporcionou um bom controle da planta daninha. O herbicida, nas doses testadas, foi seletivo à cultura do eucalipto e a convivência entre eucalipto e B. decumbens resultou em interferência negativa para ambas as espécies. HALOXYFOP-P-METHYL IN THE CONTROL OF BRACHIARIA DECUMBENS IN EUCALYPTUSABSTRACT: : Eucalyptus plantations in Brazil expanded to the Midwest region of the country in areas previously occupied by pastures, especially of Brachiaria decumbens (signal grass), making it the main weed in eucalyptus plantation. This work aimed to evaluate the efficiency of haloxyfop-P-methyl to control B. decumbens infesting eucalyptus seedlings. This experiment was set up in three situations: monoculture eucalyptus, eucalyptus in coexistence with B. decumbens and the weed cultivated alone. Haloxyfop-p-methyl was applied 67 days after plating the seedlings at doses of 0; 48 and 96 g . i . a . ha ) of haloxyfop-p-methyl provided good weed control. The herbicide, at the tested doses, was selective for eucalyptus and the relationship between eucalyptus and B. decumbens resulted in negative interference for both species.

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Características da anatomia foliar de espécies de braquiária e sua relação com a sensibilidade a herbicidas

Marques¹,

Rodella

Martins

2012

Planta daninha

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RESUMO -O objetivo deste trabalho foi relacionar as características da anatomia foliar deBrachiaria decumbens (capim-braquiária) e Brachiaria plantaginea (capim-marmelada), em três estádios de desenvolvimento da planta, com a sensibilidade a herbicidas. A semeadura foi feita em vasos plásticos, contendo solo, mantidos em casa de vegetação. Foi amostrada a porção mediana do limbo da terceira folha expandida, a partir da base do colmo, compreendendo três estádios de desenvolvimento da planta: estádio 1 (com 4-6 folhas), estádio 2 (com 3-4 perfilhos) e estádio 3 (plantas adultas no início do florescimento). Foram quantificados os seguintes descritores anatômicos das regiões da quilha (nervura central) e da asa (porção entre a nervura central e a margem do limbo): área da secção transversal; porcentagens de epiderme das faces adaxial e abaxial, esclerênquima, bainha do feixe vascular, feixe vascular e parênquima; espessura da folha; distância entre os feixes vasculares; comprimento do estômato; e número de estômatos e de tricomas (curtos e longos). Os valores obtidos foram submetidos aos testes estatísticos multivariados de Análise de Agrupamento e Análise dos Componentes Principais. Os descritores avaliados permitiram diferenciar o estádio 3 de desenvolvimento da planta em relação aos demais, o qual pode ser considerado o menos sensível à ação dos herbicidas aplicados em pós-emergência. Palavras-chave: Brachiaria decumbens, Brachiaria plantaginea, análise multivariada, folha, gramíneas. ABSTRACT -The aim of this study was to relate the leaf anatomical characteristics of Brachiaria decumbens ('Surinam grass') and

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Controle Químico Em Pós-Emergência De Espécies De Brachiaria Em Três Estádios Vegetativos

Cited by 4 publications

References 12 publications

Journal of Plant Protection Research

Journal of Plant Protection Research

Haloxifope-P-Metílico Para Controle De Brachiaria Decumbens Na Cultura Do Eucalipto

Características da anatomia foliar de espécies de braquiária e sua relação com a sensibilidade a herbicidas

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