Aspectos fisiológicos da mandioca após a aplicação dos herbicidas fluazifop-p-butil e fomesafen

-This study has aimed to evaluate selectivity and efficiency in weed control of flumioxazin and S-metolachlor in 'Baianinha' cassava crops. The experimental design was randomized blocks with four replications. Treatments consisted in doses of flumioxazin of 50, 75, 100 and 125 g ha -1 a.i. and doses of S-metolachlor of 960, 1920, 2880 and 3840 g ha -1 a.i., besides weeded and unweeded controls. Treatments application was carried on 10/11/2013, 13 days after planting (DAP) and cassava cuttings presented underground sprouts measuring 3.0 to 4.5 cm. Flumioxazin at the highest dose provided 61.5% reduction of weeds biomass while S-metolachlor at the highest dose reduced 63.7% in the weeds biomass. Both herbicides have not promoted phytointoxication and have not altered roots yield and starch content of cassava plants. In conclusion, the herbicides were selective for 'Baianinha' cassava and efficient in weed control. However, control level increased with increments of doses assessed. Keywords: herbicides; Manihot esculenta; weeds; selectivity Resumo -Objetivou-se avaliar a seletividade e a eficiência no controle de plantas daninhas do flumioxazin e do S-metolachlor na cultura da mandioca 'Baianinha'. O delineamento experimental utilizado foi de blocos casualizados com quatro repetições. Os tratamentos consistiram nas seguintes doses do flumioxazin 50, 75, 100 e 125 g ha -1 i.a. e as doses do S-metolachlor foram 960, 1920, 2880 e 3840 g ha -1 i.a., além de uma testemunha sem capina e outra capinada. A aplicação dos tratamentos foi realizada em 11/10/2013, 13 dias após o plantio (DAP) e a maniva apresentava brotos subterrâneos com 3,0 a 4,5 cm. O flumioxazin na maior dose proporcionou 61,5% de redução da biomassa das plantas daninhas, enquanto que o S-metolachlor na maior dose reduziu 63,7% na biomassa de plantas daninhas. Ambos os herbicidas não promoveram fitointoxicação e não alteraram a produtividade de raízes e teor de amido das plantas de mandioca. Concluiu-se que, os herbicidas foram seletivos para a mandioca 'Baianinha' e eficientes no controle das plantas daninhas. Entretanto, o nível de controle aumentou de acordo com incrementos das doses avaliadas.

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“…These results highlight the importance of weed management to ensure high economic returns (Silva et al, 2014).…”

Section: Introductionmentioning

confidence: 83%

Eficiência e seletividade do flumioxazin e do S-metolachlor na aplicação em pré emergência da mandioca ‘Baianinha’

Costa¹,

Ramella

Sontag³

et al. 2015

RBHerbicidas

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“…El fluazifop-P-butil, tiene como objetivo principal el control de monocotiledóneas (Cesarin et al, 2013;Rezende et al, 2012). El herbicida fluazifop-P-butil actúa inhibiendo la enzima acetil-CoA carboxilasa (ACC), bloqueando la síntesis de lípidos en las plantas susceptibles (Pereira et al, 2015;Silva et al, 2014), de esta forma su acción en el aparato fotosintético es indirecto.…”

Section: Herbicidasunclassified

Fluorescencia de la clorofila <i>a</i> en plantas de piña sometidas a aplicación de herbicidas

Corrêa¹,

Ferreira²,

Pereira³

et al. 2018

Rev. Colomb. Cienc. Hortic.

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El manejo químico de malezas con herbicidas es una actividad recomendada en cultivos, estrategia que permite un control eficaz para el cultivo de piña, que puede afectar su crecimiento y fisiología. De acuerdo a esto, el objetivo de este trabajo es evaluar el efecto de herbicidas de post-emergencia en parámetros de fluorescencia de la clorofila y tasa de transporte de electrones, relacionando la fluorescencia de la clorofila a en plantas de piña, variedad Imperial, así como, comprobar la intoxicación causada por estos productos. El experimento se realizó en campo en bloques aleatorizados en esquema factorial 5×2, siendo cuatro herbicidas (ametym, diuron, fluazifop y sulfentrazona) y el control (sin herbicida) y dos tiempos de evaluación (7 y 21 días después de la aplicación). El monitoreo de la fluorescencia de clorofila y las tasas de transporte de electrones también se llevaron a cabo a los 7 y 21 días después de la aplicación del tratamiento, siendo las variables: 1) fluorescencia inicial; 2) fluorescencia máxima; 3) relación de fluorescencia variable y fluorescencia total y 4) tasa de transporte de electrones. Los herbicidas evaluados afectaron negativamente el aparato fotosintético de las plantas de piña, el herbicida diuron seguido del ametrym fueron los productos que provocaron mayor estrés fisiológico en el cultivo. En la segunda época de evaluación, los efectos sobre el aparato fotosintético de las plantas se fueron intensificando, donde los productos probados redujeron los valores de la relación fluorescencia variable y máxima, indicando aumento del estrés causado por los herbicidas evaluados.

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“…Unlike other cultivated species, in which the use of herbicides in post-emergence is the most employed way of controlling weed community, the main modality employed in the chemical control of weeds in cassava has been pre-emergent herbicide applications (Silva et al, 2012a, Santiago et al, 2018. The variation in the positioning of herbicides in cassava crops is mainly due to the low number of herbicides registered for postemergence application of the crop, especially those with spectrum on dicotyledons, as well as the good selectivity that these active ingredients present when applied in cassava pre-emergence (Silva et al, 2014, Brazil, 2018.…”

Section: Introductionmentioning

confidence: 99%

The use of pre-emergence herbicides in cassava decreases the need of manual weeding

et al. 2020

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Weed management consists of a fundamental practice in cassava, with mechanical and chemical control widely used. The objective of this work was to evaluate the efficacy of pre-emergence herbicides, as well as to determine the interaction of these with weeding complementation in the weed management in cassava. Two experiments were conducted in Junqueiro (Alagoas). In 2015/16, the experimental design was based on randomized blocks, with treatments distributed in a split-split-plot scheme, with four replications. In the main plot, four pre-emergence associations of clomazone + flumioxazin in different doses were evaluated, in addition to a control without herbicide. In the subplots, the Caravela and Pretinha cassava cultivars were evaluated, while in the sub-subplots the control complementation was evaluated using or not the manual weeding. In the 2016/17, the plot design and layout remained the same as for 2015/16, except for the composition of the herbicide treatments, since the standardization of clomazone dose has been chosen, varying only the doses of flumioxazin. The association of clomazone and flumioxazin has shown efficacy in weed control, with a greater residual as higher doses are used. This association provided higher shoot and root yield. Weeding complementation along the cassava cycle can increase its yield.

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Aspectos fisiológicos da mandioca após a aplicação dos herbicidas fluazifop-p-butil e fomesafen

Cited by 8 publications

References 14 publications

Eficiência e seletividade do flumioxazin e do S-metolachlor na aplicação em pré emergência da mandioca ‘Baianinha’

Eficiência e seletividade do flumioxazin e do S-metolachlor na aplicação em pré emergência da mandioca ‘Baianinha’

Fluorescencia de la clorofila <i>a</i> en plantas de piña sometidas a aplicación de herbicidas

The use of pre-emergence herbicides in cassava decreases the need of manual weeding

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