How quickly does glyphosate resistance develop?
Field experience and simulation modelling suggests that the likelihood of glyphosate resistance developing can increase substantially after a population has received approximately 15 years of glyphosate applications. However, many field populations have received more glyphosate applications and have not developed glyphosate resistance. Clearly, there are several factors that can influence how quickly glyphosate resistance will develop other than just the number of herbicide applications. Most importantly for growers, management has a major influence and there are several practices available that reduce the risk of resistance developing and may extend the effective life of the herbicide (see GSWG risk guide).
