certainty herbicide rainfast Surmise Pro Glufosinate Herbicide – Non-Selective Weed Control

Surmise® Pro Non-Selective Herbicide

Professional-grade postemergence weed control powered by 24.5% glufosinate-ammonium.

Surmise® Pro is a non-selective, postemergence herbicide designed for control of emerged broadleaf weeds and grasses. As a Group 10 herbicide (glutamine synthetase inhibitor), it delivers foliar-active control with little to no soil residual activity.

Visible leaf necrosis typically occurs within 2 to 4 days after application under favorable growing conditions. Surmise Pro is rainfast 4 hours after application to most weed species.

Overview & Key Features

• Contains 24.5% glufosinate-ammonium
• Non-selective control of emerged weeds
• Foliar-active with minimal soil residual
• Rainfast in 4 hours
• Group 10 herbicide (glutamine synthetase inhibitor)
• Effective rotation partner for resistance management

Specific Weeds Controlled

Broadleaf Weeds:

Annual sowthistle, Bindweed, Buffalobur, Burdock, Canada thistle, Chickweed, Clover, Common cocklebur, Curly dock, Dandelion, Dogbane (hemp), Field growwell, Filaree, Fleabane, Goldenrod, Horsetail, Jimsonweed, Kochia, Lambsquarters, Leafy spurge, London rocket, Malva (little mallow), Marestail, Mugwort, Musk thistle, Nettle, Nightshade, Pennycress, Pigweed (redroot), Plantain, Prickly lettuce, Purslane, Ragweed, Russian thistle, Shepherd’s purse, Smartweed, Velvetleaf, Vervain, Virginia copperleaf, White heath aster, Wild buckwheat, Wild mustard, Wild onion, Wild rose, Wild turnip, Wood sorrel, Yellow rocket.

Grassy Weeds:

Annual bluegrass, Bahiagrass, Barley, Barnyardgrass, Bermudagrass, Carpetgrass, Crabgrass, Cupgrass, Dallisgrass, Downy bromegrass, Fall panicum, Fescue, Giant foxtail, Goosegrass, Green foxtail, Guineagrass, Johnsongrass (rhizome), Kentucky bluegrass, Lovegrass, Nutsedge, Paragrass, Quackgrass, Ryegrass, Sandbur, Shattercane, Smallflower alexandergrass (Signalgrass), Smooth bromegrass, Stinkgrass, Torpedograss, Vaseygrass, Wheat, Wild oat, Windgrass, Yellow foxtail.

Application & Use Details

• Use Sites: Ornamental turf, rangeland, forests, rights-of-way, industrial sites, non-crop areas, permanent grass pastures and CRP acres (including fence rows and non-irrigation ditch banks).
• For postemergence control of actively growing weeds.
• Foliar application only.
• Rainfast 4 hours after application.
• Minimal soil residual activity.

Always follow complete label directions for mixing, application rates, and restrictions.

Frequently Asked Questions

Is Surmise Pro selective?
No. It is a non-selective herbicide and will injure or kill most vegetation contacted.

How fast does it work?
Visible necrosis of treated foliage typically occurs within 2–4 days under good growing conditions.

Is it rainfast?
Yes. It is rainfast 4 hours after application to most weed species.

Does it leave soil residue?
It has little to no soil residual activity.

Compliance & Technical Information

• Active Ingredient: 24.5% Glufosinate-ammonium
• Mode of Action: Glutamine synthetase inhibitor (Group 10)
• Formulation: Liquid soluble concentrate
• EPA Registration Number: 42750-365-89442
• Signal Word: CAUTION
• Restricted Use: No
• View EPA Label (PDF)
• View SDS (PDF)

Please refer to label for instructions on use rates and sites the product may be used.