Data/hora: 02/06/2024 06:50:57

Provedor de dados: | 1
País: | Brazil
Título: | Glyphosate efficacy on sourgrass biotypes with suspected resistance collected in GR-crop fields
Autores: | Silveira, Hellen Martins da; Langaro, Ana Claudia; la Cruz, Ricardo Alcántara-de; Sediyama, Tocio; Silva, Antonio Alberto.
Data: | 2018-02-09
Ano: | 2018
Palavras-chave: | Agricultural Sciences chemical control; Digitaria insularis; Dose response; Resistance factor. Fitotecnia Fitotecnia.
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 &gt; 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 &lt; GO &lt; MT &lt; 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês

Identificador:

http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35120

10.4025/actasciagron.v40i1.35120

Editor: | Universidade Estadual de Maringá
Relação: | http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35120/pdf
Formato: | application/pdf

Fonte:

Acta Scientiarum. Agronomy; v. 40 (2018): Publicação Contínua; e35120

Acta Scientiarum. Agronomy; v. 40 (2018): Publicação Contínua; e35120

1807-8621

1679-9275

Fonte: | Direitos autorais 2017 Acta Scientiarum. Agronomy