| Registro completo |
| Provedor de dados: |
Agronomy
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| País: |
Brazil
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| Título: |
Glyphosate efficacy on sourgrass biotypes with suspected resistance collected in GR-crop fields
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| Autores: |
Silveira, Hellen Martins da
Langaro, Ana Claudia
la Cruz, Ricardo Alcántara-de
Sediyama, Tocio
Silva, Antonio Alberto
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| Data: |
2018-02-09
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| Ano: |
2018
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| Palavras-chave: |
Chemical control
Digitaria insularis
Dose response
Resistance factor.
Fitotecnia
Fitotecnia
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| Resumo: |
In Brazil, infestations of crop areas with glyphosate-resistant (GR) sourgrass (Digitaria insularis (L.) Fedde) biotypes has risen significantly, increasing crop production costs. Glyphosate efficacy on three biotypes (GO, BA and MT) of sourgrass with suspected resistance was evaluated. A susceptible biotype (MG) was used as the control. The results confirmed that the MG and GO biotypes were susceptible to glyphosate (control > 90%). The MG biotype exhibited growth reduction and mortality by 50% (GR50 and LD50, respectively) with mean glyphosate doses of 243.7 and 431.6 g ae ha-1. The resistance index of the biotypes with suspected resistance ranged from 2.8 to 6.1 in relation to GR50 and between 1.4 to 26.7 in relation to LD50. The glyphosate susceptibility ranking of the sourgrass biotypes was MG < GO < MT < BA. The MT and BA biotypes demonstrated high glyphosate resistance levels, and the GO biotype had a high potential to develop resistance. Farmers should avoid the application of glyphosate overdoses to minimize the selection pressure on weeds.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35120
10.4025/actasciagron.v40i1.35120
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| Editor: |
Universidade Estadual de Maringá
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| Relação: |
http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35120/pdf
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| Formato: |
application/pdf
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| Fonte: |
Acta Scientiarum. Agronomy; Vol 40 (2018): Publicação Contínua; e35120
Acta Scientiarum. Agronomy; v. 40 (2018): Publicação Contínua; e35120
1807-8621
1679-9275
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| Direitos: |
Copyright (c) 2017 Acta Scientiarum. Agronomy
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