variabilidade no grau de resistência de capim-marmelada (brachiaria plantaginea) aos herbicidas clethodim, tepraloxydim e sethoxydim variability in the degree of resistance of alexandergrass (brachiaria plantaginea) to the herbicides clethodim, tepraloxydim, and sethoxydim
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Abstract
The continuous use of herbicides with a single mechanism of action results in selection pressure of resistant weed biotypes. In Brazil, the first manifestations of resistance occurred with Alexandergrass species (Brachiaria plantaginea), beggarticks (Bidens spp.) and wild poinsettia (Euphorbia heterophylla). The occurrence of weed resistance to a particular product has been found to extend to other products with the same mechanism of action. It is known, however, that the degree of resistance can vary among products and ultimately resistance may occur only to some compounds. Two experiments were carried out under glasshouse conditions in Londrina-Parana to evaluate possible differences in the efficiency of ACCase-inhibiting herbicides in resistant Alexandergrass biotypes. Treatments included the herbicides sethoxydim, clethodim and tepraloxydim at different doses. In the first experiment, the herbicides were applied on plants at 1-to-2 tyller (checar este termo!) growth stage and in the second experiment, on plants at 2-to3 tyller (checar este termo!) growth stage. Although the three herbicides act as ACCase - inhibitors, a great difference was observed in the degree of resistance of Alexandergrass to these products. Results indicated that the biotype considered resistant to sethoxydim was susceptible to clethodim and tepraloxydim.
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gazziero2004plantavariabilidade
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| Journal | anti-cancer agents in medicinal chemistry |
| Year | 2004 |
| DOI |
10.1590/S0100-83582004000300009
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