Poast Herbicide affects the lipid synthesis by inhibition of Acetyl CoA Carboxylase (ACCase) in plants. It belongs to herbicide mode-of-action Group 1. Lipids are an important component in cell division and plant growth. If plant cells cannot divide, the plant will die.
Poast rapidly enters the target grass weed through its foliage and moves throughout the plant. Effects range from slowing or stopping growth (typically within 2 days) to foliage reddening and leaf tip burn. Foliage burnback may occur later. Symptoms are typically observed within 3 weeks of application of Poast, depending on environmental conditions.
Apply Poast herbicide to actively growing grass weeds by aerial or ground application at the rates and timing (maximum height) listed (annual grass weeds), (perennial grass weeds), and (early and rescue treatments to control select annual grass weeds), as instructed in the Use-specific Information section of this label. For small area application or spot application, refer to Label.
The most effective control will be achieved by applying post-emergence applications of Poast early in the growing season, when grass weeds are small. Poast may not be effective on grass weeds that have grown taller than the maximum heights listed.