Tolerância do Tifton 85 ao glyphosate em diferentes épocas de aplicação

Santos, Maurinho Luiz dos; Freitas, Francisco Cláudio Lopes de; Ferreira, Francisco Affonso; Carvalho, Abner José de; Braz, T.G.S.; Cavali, Jucilene; Rodrigues, Orismário Lúcio

doi:10.1590/s0100-83582010000100016

Cited by 11 publications

(11 citation statements)

References 15 publications

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“…Santos et al (2007) também relataram alta capacidade de rebrota de Tifton 85 submetido à dose de 1.800 g ha -1 de e.a. Os autores somente observaram controle superior a 90% quando as doses foram acima de 2.637 e 3.607 g ha -1 de e.a, em aplicações realizadas no inverno e no verão, respectivamente (Santos et al, 2010).…”

Section: Resultsunclassified

Capacidade de restabelecimento da grama-estrela-africana após aplicação de glifosato em pré-semeadura de milho

Brighenti

Martins

Sobrinho

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a capacidade de restabelecimento de pastagem de grama-estrela-africana (Cynodon nlemfuensis) após aplicação do herbicida glifosato, na pré-semeadura da cultura do milho. Utilizou-se o delineamento experimental de blocos ao acaso, com quatro repetições. Os tratamentos foram: doses do equivalente ácido (e.a.) do herbicida glifosato (0, 720, 1.440, 2.160, 2.880 e 3.600 g ha -1 ) e a testemunha capinada. A grama-estrela-africana é tolerante às doses normalmente recomendadas do herbicida (720 a 1.080 g ha -1 de e.a). Doses de glifosato de 1.232 a 1.439 g ha -1 de e.a. suprimem a grama-estrela-africana, evitam sua competição com a cultura do milho, e permitem a recuperação da pastagem após a colheita do milho.Termos para indexação: Cynodon nlemfuensis, consórcio, formação de palhada, integração lavoura-pecuária, plantio direto, tolerância ao glifosato. Recovery capacity of African star grass after application of glyphosate in pre-sowing of cornAbstract -The objective of this work was to evaluate the recovery capacity of African star grass (Cynodon nlemfuensis) after glyphosate application in pre-sowing of corn. A randomized block design was used, with four replicates. The treatments were doses of acid equivalent (a.e.) of the herbicide glyphosate (0, 720, 1,440, 2,160, 2,880, and 3,600 g ha) and a hoed control. African star grass is tolerant to the usually recommended doses of the herbicide (720 to 1,080 g ha -1 a.e.). Doses of glyphosate, ranging from 1,232 to 1,439 g ha -1 a.e. suppress the grass, avoid its competition with corn, and allow the recovery of the pasture after the corn harvest.

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Section: Resultsunclassified

Capacidade de restabelecimento da grama-estrela-africana após aplicação de glifosato em pré-semeadura de milho

Brighenti

Martins

Sobrinho

et al. 2012

Pesq. agropec. bras.

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“…The phytotoxic effect of glyphosate on Tifton 85 plants was only higher than 90% when the doses were 2,636 and 3,607 g/ha in winter and summer applications, respectively (Santos et al, ). The authors added that it is possible to control Brachiaria with low doses of glyphosate due to the greater tolerance of Tifton 85 to this herbicide, without compromising the forage yield (Santos et al, , ). Abdullahi () found that plowing with the application of 2,160 g ae/ha of glyphosate after sprouting was necessary to provide satisfactory control of Bermuda grass ( C. dactylon ).…”

Section: Resultsmentioning

confidence: 99%

Differential tolerance and selectivity of herbicides in forages of the genus Cynodon

2019

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Plant recovery due to herbicide symptoms of phytotoxicity characterizes an additional waste of energy that should not be accepted as a natural physiologic response; therefore, it might result in yield losses. Herbicide‐tolerant forages and the use of less phytotoxic products on pastures provide improvements in chemical weed control and increases in forage yield. The objectives of this study were to test differences between Tifton 85 (Cynodon spp.) and African star grass (Cynodon nlemfuensis) in relation to their degree of tolerance to herbicides, as well as the selectivity of herbicides for both species. The experimental design was completely randomized, in a 2 × 8 factorial, with four replicates. Two species of Cynodon and eight herbicide treatments were evaluated. The tolerance and selectivity of herbicides for Tifton 85 and African star grass are a function of each species and the type and dose of herbicide applied. Among the two species of Cynodon, Tifton 85, in general, was more tolerant to the applied herbicides than was the African star grass and consequently with less probability to occur forage yield losses. The most phytotoxic herbicides for both forages were fluroxypyr + aminopyralid (160.0 + 80.0 g ae/ha [grams of acid equivalent per hectare]), fluroxypyr + triclopyr (320.0 + 960.0 g ae/ha) and glyphosate (180 g ae/ha). The most selective herbicides were bentazon (720.0 g ai/ha [grams of active ingredient per hectare]), imazapyr (25.0 g ai/ha) and MSMA (1,440.0 g ai/ha), which have potential for use in fields of Tifton 85 and African star grass.

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“…When Santos et al, (2010) assessed the tolerance of Tifton 85 to glyphosate in two different application periods, they elucidated that plants exposed to this herbicide in cooler periods of the year (winter) have lower tolerance when compared with plants exposed to this herbicide in the summer. As reported by Santos et al (2006Santos et al ( , 2007Santos et al ( , 2008, Tifton 85 plants, in the summer, tend to have greater tolerance to glyphosate, possibly due to favorable conditions for growth and development, such as temperature and rooting, which may be related to the ease of metabolism, conjugation and, or, exudation of herbicides by plants, in addition to further development of starchy rhizomes, serving as reserves for regrowth of plants.…”

Section: Resultsmentioning

confidence: 99%

Brachiaria brizantha control by using fluazifop-p-butil on Tifton 85 pasture formation

Santos¹,

Ferreira²,

Freitas³

et al. 2012

R. Bras. Zootec.

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-This study was carried out with the aim of assessing the efficacy of the fluazifop-p-butyl herbicide to control Sixty days after application, plants were harvested at ground level and oven-dried. Regrowth was assessed in the same manner, 60 days after cutting, to determine their dry weight. Control of B. brizantha was noted to be above 50%, from doses of 218.75 g ha -1 at 45 days after application. The fluazifop-p-butylherbicide did not show to be efficient in the control of B. brizantha in the doses assessed and caused intoxication to Tifton 85 plants.

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Tolerância do Tifton 85 ao glyphosate em diferentes épocas de aplicação

Cited by 11 publications

References 15 publications

Capacidade de restabelecimento da grama-estrela-africana após aplicação de glifosato em pré-semeadura de milho

Capacidade de restabelecimento da grama-estrela-africana após aplicação de glifosato em pré-semeadura de milho

Differential tolerance and selectivity of herbicides in forages of the genus Cynodon

Brachiaria brizantha control by using fluazifop-p-butil on Tifton 85 pasture formation

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