Surmise Pro is a postemergence, non-selective, herbicide that mixes readily with water to be applied as a spray for the control of broadleaf weeds and grasses. A group 10 herbicide (glutamine synthetase inhibitor), Surmise Pro is a foliar-active material with little or no soil-residual activity. Visual results showing necrosis of leaves and young shoots occur within 2 to 4 days after application under good growing conditions.

Surmise Pro is rainfast four (4) hours after application to most weed species; therefore, rainfall within four (4) hours may necessitate retreatment or may result in reduced weed control.