Resistance is a naturally occuring, inherited ability of some weed biotypes to survive a herbicide treatment that should, under normal use conditions, effectively control a weed population. Some herbicide resistant weeds have naturally developed one or more mechanisms that allow them to survive a herbicide treatment.
For a weed to be considered resistant it must:
- Normally be controlled by the herbicide
- Survive a usually lethal dose of the herbicide
- Be heritable, meaning it is passed from generation to generation
Herbicide-resistant individuals are naturally present within a weed population at very low frequencies.
Did you know that there are over 20 Group 1 herbicides on the market?