Ecological fitness of tribenuron methyl (Alsinhibitor Herbicide) Susceptible and resistant biotypes of wild mustard in competition with wheat

Abstract

The occurrence of ALS-herbicide-resistant Sinapis arvensis in wheat crops causes crop yield losses, which makes it necessary to understand the factors that influence the interference of this weed to develop safer management strategies. This study was aimed to evaluate the ecological fitness of wild mustard that is susceptible (S biotypes) and resistant (R biotypes) to Tribenuron Methyl herbicide in competition with wheat in 2014-2017. The experiments were conducted in a greenhouse using a completely randomized design with four replications. The treatments were placed in pots and arranged in replacement series for three experiments: 1) wheat with the R biotype; 2) wheat with the S biotype; and 3) the R biotype with the S biotype) at the following ratios: 100:0, 75:25, 50:50, 25:75, and 0:100. The results showed that S biotype of wild mustard was more competitive than R biotype. There was no significant difference between S biotype and R biotype with accordance of the aggressivity index. The difference between the relative yield of wheat and biotypes of S. arvensis was significant, and regarding relative yield total, the S biotype was superior. Relative seed production index as the resultant index of competition at similar densities was not significant.