- Defined as the growth stages or time during which weeds must be controlled to maintain maximum yield potential. Assumes the field is clean at planting time.
- Corn: weeds can reduce yield as soon as the V2 stage. Control weeds earlier than this and maintain control through at least V14 to help ensure maximum yield potential.
- Soybean: control weeds within the first 4 weeks. Maintain control through canopy closure.
Preventing weed seed production: Control weeds to minimize competitive effects but also to prevent seed production, especially for glyphosate-resistant weeds like waterhemp, Palmer amaranth and ragweeds.