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 when multiple groups are used in conjunction with one another as opposed to repetitive application of individual modes, they can effectively delay the onset of resistance for an additional five to seven years?