Primesource Meso 4 SC Select Herbicide

Provides post-emergent control of tough-to-control weeds.

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Active Ingredient %
Mesotrione 40.00 %
Other Ingredients 60.00 %
Mode of Action
Lipid Synthesis Inhibitors
Site of Action
(1) ACCase Inhibitor
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$7.60 / fl oz
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Currently using selected product for label rate and application cost estimates.
Safe On
St. Augustinegrass
Safe Rate:
0.09 fluid ounces per 1,000 sqft
Kentucky Bluegrass, Centipedegrass, Buffalograss, Tall Fescue
Safe Rate:
0.09 - 0.18 fluid ounces per 1,000 sqft
Perennial Ryegrass, Fine Fescue, Red Fescue, Chewings Fescue, Hard Fescue
Safe Rate:
0.11 fluid ounces per 1,000 sqft
Not Safe On
No not safe on treatments listed. Please, review the label or contact the merchant for more information.
Maximum Yearly Limits
DO NOT apply more than 16 oz. (or 0.50 lb. mesotrione per acre per year) per acre per year or per crop whichever is shorter.
Water Instructions
If applied pre-emergence, it is absorbed when emerging from the soil. Pre-emergence activity and control is reduced under dry conditions. Activate Meso 4 SC Select with 0.15 inches of irrigation if rain hasn’t fallen within 10 days of application for pre-emergence.
Before Seeding Instructions
Apply 5-8 fl. oz. Meso 4 SC Select per acre in at least 30 gallons of water per acre before seeding or after seeding of tolerance turfgrass species listed below, except fine fescue, as application to fine fescue can reduce grass density. Meso 4 SC Select can be effectively used on grass seed blends that contain <20% by weight hard/fine fescue. For optimal control, apply at grass seeding or as close to seeding as possible.
After Seeding Instructions
DO NOT spray on newly germinated turfgrass. Delay treatment until grass has been mowed 2-4 times and/or 4 weeks after emergence (whichever is longer).
Surfactant Instructions
Add a nonionic surfactant when making post- emergence applications.

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Weeds Controlled by Primesource Meso 4 SC Select

No Control
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