Abstract: An autonomous herbicide applicator system includes detecting, at a first time, a weed at a first location within a field. The system identifies one or more characteristics of the weed and/or environment and determines an herbicide application strategy for the weed based on the one or more characteristics. The system activates a solenoid to enable a flow of herbicide via an applicator nozzle to treat the weed in accordance with the herbicide application strategy. The system navigates back to the first location from another location at a second time and detects a condition of the weed. The system updates the herbicide application strategy for the one or more characteristics in response to the condition of the weed at the second time. The updating causes the system to change how herbicide is subsequently applied to weeds having the one or more characteristics.