Identification is the first step in forming a weed management plan.
Early detection is always the best defense against noxious weeds. Treat intensely when a new or small patch is found. Know which growth stage to implement control measures so that control is most effective. For example, once a biennial or annual has gone to seed, it is too late to do anything about it. Spraying a perennial in the rosette stage is a waste of chemicals as the root system will send up new shoots.