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Back to Registered Crop Input Products
Registered Crop Input Products / MST 4 SC Herbicide

MST 4 SC Herbicide

PCP #35442 · Bayer Cropscience Inc. · Herbicide

Group 27

Group 27 herbicide containing mesotrione at 480 g/L for pre-emergent and post-emergent control of broadleaf weeds in soybeans, field corn, sweet corn, seed corn, cranberries, asparagus, blueberries, sod production, sorghum, and rhubarb. Provides control of redroot pigweed, velvetleaf, lamb's-quarters, wild mustard, eastern black nightshade, and suppression of common ragweed.

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Registered uses (44)

Crop × pest × application rate combinations from the official label. Rates converted to per-acre. Always confirm against the official label PDF before applying.

CropTargetRatePHI
AsparagusLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression only)0.121 L/acre–
AsparagusLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression only)0.121 L/acre–
BlueberryEastern black nightshade, velvetleaf, redroot pigweed, common ragweed (suppression)0.121 L/acre–
BlueberryEastern black nightshade, velvetleaf, redroot pigweed, common ragweed (suppression)0.121 L/acre60 d
BlueberryEastern black nightshade, velvetleaf, redroot pigweed, common ragweed (suppression)0.121 L/acre–
BlueberryEastern black nightshade, velvetleaf, redroot pigweed, common ragweed (suppression)0.121 L/acre60 d
BlueberryLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre–
BlueberryLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre60 d
BlueberryLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre–
BlueberryLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre60 d
CornBroadleaf weeds0.085 L/acre–
CornBroadleaf weeds0.085 L/acre50 d
CornEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression only)0.085 L/acre100 d
CornEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression only)0.085 L/acre100 d
CornLamb's quarters, wild mustard, redroot pigweed, common ragweed (suppression), velvetleaf0.121 L/acre100 d
CornLamb's quarters, wild mustard, redroot pigweed, common ragweed (suppression), velvetleaf0.121 L/acre100 d
CornLamb's quarters, wild mustard, redroot pigweed, common ragweed (suppression), velvetleaf0.121 L/acre100 d
CornNot Specified0.085 L/acre–
CornNot Specified0.085 L/acre50 d
CornTall waterhemp0.121 L/acre100 d
CornVolunteer adzuki bean, large crabgrass, giant ragweed, tall waterhemp, common cocklebur0.085 L/acre100 d
CornVolunteer adzuki bean, large crabgrass, giant ragweed, tall waterhemp, common cocklebur (suppression)0.085 L/acre100 d
CranberryCinquefoil (suppression), goldenrod, rushes (suppression), sedges (suppression)0.085 L/acre60 d
CranberryCinquefoil, goldenrod, rushes, sedges (suppression)0.085 L/acre60 d
CranberryEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression), vetch (suppression), creeping buttercup (suppression)0.085 L/acre60 d
CranberryEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression), vetch (suppression), creeping buttercup (suppression)0.085 L/acre60 d
CranberryLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression), vetch (suppression), creeping buttercup (suppression)0.121 L/acre60 d
CranberryLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression), vetch (suppression), creeping buttercup (suppression)0.121 L/acre60 d
RhubarbLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre42 d
RhubarbLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre42 d
SodEastern black nightshade, velvetleaf, redroot pigweed, common ragweed (suppression)0.085 L/acre–
SodLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre–
SorghumLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre–
SorghumLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre–
SoybeanEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression only)0.085 L/acre45 d
SoybeanEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression only)0.085 L/acre45 d
SoybeanEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression only), lamb's quarters, wild mustard0.085–0.121 L/acre45 d
SoybeanEastern black nightshade, redroot pigweed, velvetleaf, common ragweed (suppression only), lamb's-quarters, wild mustard0.085–0.121 L/acre45 d
SoybeanLamb's quarters, wild mustard, redroot pigweed, common ragweed (suppression), velvetleaf0.121 L/acre–
SoybeanLamb's quarters, wild mustard, redroot pigweed, common ragweed (suppression), velvetleaf0.121 L/acre45 d
SoybeanRedroot pigweed, velvetleaf, common ragweed (suppression only), lamb's-quarters, wild mustard0.121 L/acre45 d
SoybeanRedroot pigweed, velvetleaf, common ragweed (suppression only), lambs-quarters, wild mustard0.121 L/acre45 d
TurfEastern black nightshade, velvetleaf, redroot pigweed, common ragweed (suppression)0.085 L/acre–
TurfLamb's-quarters, redroot pigweed, velvetleaf, wild mustard, common ragweed (suppression)0.121 L/acre–

About this content. This page presents the official PRD label as published by Health Canada's Pesticides Regulatory Directorate (formerly the Pest Management Regulatory Agency), the source of record. Always read the official label and consult your provincial pesticide- application authority before use. Report an error.

Quick facts

Active ingredients
mesotrione 480 g/L
Group 27
Mode of action: HPPD inhibitor (HRAC 27, Triketone)
CAS 104206-82-8
Formulation
suspension concentrate
Resistance group
Group 27
First registered
2025-03-18
Registration expiry
2030-12-31