Herbicide mode of action - The sequence of events from absorption of the herbicide into the plant through plant death. Refers to all plant-herbicide interactions. The primary biochemical site that is affected by the herbicide, ulti-mately resulting in the death of the plant. Also referred to as herbicide mechanism of action. Necrosis - The death of specific plant tissue while the rest of the plant is still alive.
Necrotic areas are generally dark brown in color.
A time of herbicide application occurring after the crop and weeds emerge from the soil. Also referred to as a foliar application. Preemergence application - A time of herbicide application occurring after a crop is planted but before the crop or weeds emerge from the soil. Preplanting application - A time of herbicide application occurring before the crop is planted. I to 2 inches of soil.