Germination test as a fast method to detect glyphosate-resistant sourgrass

Abstract

The occurrence of weed species with different levels of resistance to glyphosate has increasingly spread in agricultural areas. In Brazil, sourgrass is among the main species presenting issues in this regard. Thus, fast and reliable methods to detect glyphosate resistance are of special interest for this specie, either for research or rational management purposes. This study was carried out to verify the feasibility of using the germination test to detect glyphosate resistance in sourgrass. The experiment was conducted with two sourgrass biotypes, with different levels of susceptibility to glyphosate. The seeds were previously imbibed in solutions composed of 0, 0.1875%, 0.25%, 0.75%, 1.5%, 3% and 6% of glyphosate during two periods, five and ten minutes, and submitted to germination tests. The results indicate the germination test as a feasible and time-saving approach to evaluate glyphosate-resistant sourgrass, with results available in seven days.

Rapid Detection of Horseweed and Black Picker Sensitivity Levels to Saflufenacil

“…The early identification of the sensitivity levels of weeds to herbicides through rapid methods allows the adoption of more assertive weed management methods and allows a correct and timely decision-making for weed management (Vidal et al, 2006;Dias et al, 2015). In addition, rapid methods may assist in the monitoring of weed populations in agricultural areas in response to the application of herbicides, preventing a dissemination of the resistance and contributing to a reduction in costs and in the impact in the management of resistant biotypes (Dias et al, 2015).…”

“…These tests are relatively simple and may even be conducted in the farm by an engineer-agronomist, accelerating the detection of the problem. The use of the filter paper and the commercial formulation of the product make it easier to conduct the test in the farm environment (Dias et al, 2015).…”