Controle de papuã (Brachiaria plantaginea) em soja em função da dose e da época de aplicação do herbicida clethodim

Fleck, Nilson Gilberto; Lazaroto, Carlos Alberto; Schaedler, Carlos Eduardo; Ferreira, Fausto Borges

doi:10.1590/s0100-83582008000200014

Cited by 11 publications

(12 citation statements)

References 23 publications

(21 reference statements)

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“…Regarding the variable PH, results showed that the resistant biotype was 43% higher compared to the susceptible at 140 DAE, with similar values between biotypes in evaluations carried out up to 60 DAE ( Figure 2B). PH is an important morphological characteristic that interferes with light competition (Fleck et al, 2008) due to the ability to prevent the shade, allowing plants a higher competitive ability with surrounding plants (Fleck et al, 2006). Similar results were observed in ryegrass biotypes resistant to the herbicides iodosulfuron-methyl and fluazifop, with a higher PH observed in evaluations from 60 DAE (Fraga et al, 2013;Mariani et al, 2016).…”

Section: Fitness Costsupporting

confidence: 65%

Fitness Cost and Competitive Ability of Ryegrass Susceptible and with Multiple Resistance to Glyphosate, Iodosulfuron-Methyl, and Pyroxsulam

et al. 2019

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Ryegrass is an important weed in wheat cultivations due to the evolution of resistance to different mechanisms of action. This study aimed to compare the phenological development, fitness cost, and competitive ability between ryegrass biotypes susceptible and with multiple resistance to 5-enolpyruvylshikimate-3-phosphate synthase (EPSPs) and acetolactate synthase (ALS) inhibiting herbicides. Fitness cost and phenological development were evaluated from biotypes grown in pots, and morphological growth variables were determined up to 140 days after emergence. Phenological development was evaluated with a fitness cost. Competitive ability was determined in a replacement-series experiment with proportions of resistant and susceptible ryegrass. The tested proportions were 100:0 (pure resistant ryegrass stand), 75:25, 50:50, 25:75, and 0:100% (pure susceptible ryegrass stand), where the number of tillers, height, leaf area, and shoot dry matter were evaluated at 50 days after emergence. The longer tillering period of resistant ryegrass was the main factor involved in the difference in phenological development between biotypes. The resistant biotype was superior to the susceptible regarding height, shoot dry matter, and absolute growth rate, while the susceptible biotype had a higher number of tillers and leaf area ratio. Thus, the resistant biotype had no fitness cost. For competitive ability, no difference was observed between biotypes in the different tested proportions when they occupied the same ecological niche.

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Section: Fitness Costsupporting

confidence: 65%

Fitness Cost and Competitive Ability of Ryegrass Susceptible and with Multiple Resistance to Glyphosate, Iodosulfuron-Methyl, and Pyroxsulam

et al. 2019

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“…Nesse sentido, considera-se que o controle eficiente de plantas daninhas com o uso de herbicidas em pós-emergência depende, sobretudo, do estádio de desenvolvimento das plantas-alvo (Askew et al, 2000;Johnson & Hoverstad, 2002;Fleck et al, 2008). O emprego inadequado do glyphosate para controlar a trapoeraba, em seus diferentes estádios fenológicos, pode promover gasto desnecessário de capital e energia química (dose demasiadamente elevada nos estádios iniciais) ou mesmo resultar em baixo controle (estádios mais avançados).…”

Section: Introductionunclassified

Fenologia da trapoeraba como indicador para tolerância ao herbicida glyphosate

Dias¹,

Carvalho²,

Christoffoleti

2013

Planta daninha

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Rotineiramente, tem sido desconsiderada a contribuição do estádio de desenvolvimento das espécies de plantas daninhas nas análises de tolerância ou resistência a herbicidas, o que pode resultar em divergências entre a pesquisa teórica e a aplicação prática dos dados. Nesse sentido, este trabalho foi desenvolvido com o objetivo de avaliar a resposta biológica da trapoeraba (Commelina benghalensis), comparativamente ao capim-marmelada (Brachiaria plantaginea), a aplicações de doses do herbicida glyphosate, em seis estádios fenológicos. Dois experimentos foram desenvolvidos em casa de vegetação, submetendo-se plantas de trapoeraba e capim-marmelada ao esquema fatorial de tratamentos 9 x 6, em que nove foram as doses de glyphosate e seis foram os estádios fenológicos das plantas daninhas, variáveis entre a emissão da primeira folha definitiva e o início do florescimento. Por meio do emprego de curvas de dose-resposta e de regressões polinomiais, concluiu-se que o estádio de desenvolvimento da trapoeraba contribui significativamente para o grau de tolerância da espécie ao herbicida glyphosate, de modo que, comparativamente ao capim-marmelada, plantas de trapoeraba tornam-se quatro vezes mais tolerantes ao glyphosate a cada dez unidades de desenvolvimento fenológico na escala BBCH. Essas considerações possuem importante aplicabilidade prática, justificando medidas de controle químico em estádios iniciais do crescimento da trapoeraba.

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“…This suggests that the plant developmental stage caused these results, since herbicides may have different levels of weed control, depending on the developmental stage, the herbicide dose, application and environment conditions (FLECK et al, 2008). Herbicide atrazina, carfentrazone, glyphosate, MSMA and paraquat herbicides, when when applied at stages 11 and 12 occasioned the lowest values for the plant height of C. benghalensis, showing efficacy in controlling this weed.…”

Section: Resultsmentioning

confidence: 98%

Morpho-physiological behavior of Commelina benghalensis in response to herbicides aplied in post-emergency

Krolikowski¹,

Carvalho²,

Teodoro³

2017

Biosci. J.

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Given the difficulty in controlling dayflower, the aim was to identify what herbicide provides the better control of Commelina benghalensis and the better developmental stage for its application. The plants were grown in pots containing 2 L Bioplant substrate and soil being maintained throughout the trial at a greenhouse. Experimental design was completely randomized with four replications in factorial 8 x 5, so seven herbicides in recommended commercial rates (atrazine, carfentrazone, flumioxazin, glyphosate, MSMA, nicosulfuron and paraquat) and control applied at 5 phenological stages adjusted to BBCH scale. It was observed that the plant phenological stage affects the efficiency of chemical control. Plants at early development stages (BBCH 11 and 12) were more susceptible to herbicides, occurring control in its entirety only with atrazine, carfentrazone, MSMA and paraquat. Despite suffering injuries, C. benghalensis showed tolerance to others treatments.

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Controle de papuã (Brachiaria plantaginea) em soja em função da dose e da época de aplicação do herbicida clethodim

Cited by 11 publications

References 23 publications

Fitness Cost and Competitive Ability of Ryegrass Susceptible and with Multiple Resistance to Glyphosate, Iodosulfuron-Methyl, and Pyroxsulam

Fitness Cost and Competitive Ability of Ryegrass Susceptible and with Multiple Resistance to Glyphosate, Iodosulfuron-Methyl, and Pyroxsulam

Fenologia da trapoeraba como indicador para tolerância ao herbicida glyphosate

Morpho-physiological behavior of Commelina benghalensis in response to herbicides aplied in post-emergency

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