Pyrithiobac-sodium : atividade residual sobre plantas daninhas e seletividade da mistura com amonio-glufosinate em algodoeiro transgênico Liberty Link®
This study aimed to evaluate the effect of residual activity of pyrithiobac-sodium in the control of important weeds of cotton crop, as well as the selectivity of this herbicide in association with ammonium-glufosinate to transgenic variety cotton LL® (Liberty Link). From the results generated in th...
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| Formato: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | Brasil |
| Recursos: | Universidade Estadual de Maringá (UEM) |
| Repositorio: | Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) |
| Idioma: | portugués |
| OAI Identifier: | oai:localhost:1/1292 |
| Acesso em linha: | http://repositorio.uem.br:8080/jspui/handle/1/1292 |
| Access Level: | acceso abierto |
| Palavra-chave: | Gossypium hirsurum L (algodão) Pré-emergência Fitointoxicação Inibidor da glutamina sintetase Inibidor da acetolactato sintetase Mistura em tanque Herbicidas Brasil. Hirsurum L Gossypium (cotton) Pre-emergence Phytointoxication Inhibitor of glutamine synthetase Acetolactate synthase inhibitor Tank mixing Herbicides Brazil. Ciências Agrárias Agronomia |
| Resumo: | This study aimed to evaluate the effect of residual activity of pyrithiobac-sodium in the control of important weeds of cotton crop, as well as the selectivity of this herbicide in association with ammonium-glufosinate to transgenic variety cotton LL® (Liberty Link). From the results generated in the experiments, the following conclusions: the biotype of B. pilosa demonstrated no sensitivity to pyrithiobac-sodium applied to the soil showing a possible resistance to ALS herbicide inhibitors. Growth of Euphorbia heterophylla resistant to ALS herbicide inhibitors was restricted by the residual activity of pyrithiobac-sodium in soil, although there was no death of plants. Residual activity of pyrithiobac-sodium caused restriction to the vegetative growth of other species evaluated. The residual activity pyrithiobac-sodium in soil decreases with time; the first application time provided lower levels of control for the species in this study. Increased doses of pyrithiobac-sodium provides longer residual control of this herbicide in soil. The species that demonstrated high sensibility to the residual activity of pyrithiobacsodium were, in descending order: N. physaloides, A. tenella, S. americanum, S. latifolia, A. lividus, A. hybridus, C. benghalensis, soja RR®, I. grandifolia, E. heterophylla and T. procumbens. The transgenic cotton LL® was tolerant to ammoniumglufosinate and crop yield decreases were not found after use of up to 1500 g ha-1 of this product, divided in three applications. The mixture of pyrithiobac-sodium with ammonium-glufosinate was found to be selective to the cotton only for one postemergence application. |
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