Herbicide label
Fierce MTZ Herbicide Label
Fierce MTZ (EPA 59639-236) is a Group 5, 14, and 15 flumioxazin, metribuzin, and pyroxasulfone herbicide labeled for 3 crops. The label lists 66 controlled weeds, plus partial-control, suppression, and partner-control categories.
Fierce MTZ label facts
- Product Fierce MTZ
- EPA Reg. No. 59639-236
- Registrant Valent U. S. A. LLC
- Active ingredient flumioxazin, metribuzin, and pyroxasulfone
- MOA group 5, 14, and 15
Crops on the Fierce MTZ label
Fierce MTZ is labeled for these 3 crops and uses, per the EPA label.
Weeds on the Fierce MTZ label
The Fierce MTZ label names 73 weeds and rates each by how the product handles it: full control, partial control, suppression, or control with a tank-mix partner. A weed can fall at more than one level, because control varies by crop, rate, and timing.
Controls
full control66- amaranth, palmer
- amaranth, spiny
- anoda, spurred
- barnyardgrass, common
- beggarweed, florida
- bluegrass, annual
- brome, downy
- carpetweed
- cheat
- chickweed, common
- chickweed, mouseear
- crabgrass, large
- crabgrass, smooth
- croton, tropic
- crownbeard, golden
- cupgrass, southwestern
- dandelion
- eclipta
- eveningprimrose, cutleaf
- foxtail, giant
- foxtail, green
- foxtail, yellow
- goosegrass
- henbit
- horseweed
- indigo, hairy
- jimsonweed
- johnsongrass
- kochia
- lambsquarters, common
- lovegrass, california
- mallow, little
- mallow, venice
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, scarlet
- morningglory, smallflower
- morningglory, tall
- mustard, wild
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- panicum, fall
- panicum, texas
- pigweed, redroot
- pigweed, smooth
- pigweed, tumble
- poinsettia, wild
- puncturevine
- purslane, common
- pusley, florida
- radish, wild
- ragweed, common
- red rice
- redmaids
- ryegrass, italian
- ryegrass, rigid
- senna, coffee
- sesbania, hemp
- shepherd's-purse
- sida, prickly
- signalgrass, broadleaf
- spurge, spotted
- thistle, russian
- velvetleaf
- waterhemp, common
Suppression
suppression7- buckwheat, wild
- copperleaf, hophornbeam
- ladysthumb
- ragweed, giant
- smartweed, pennsylvania
- starbur, bristly
- wormwood, biennial
Fierce MTZ rates and plant-back
The label answers both with a table, not a single number. Here is what drives each answer.
Application rate
Your rate depends on your crop.
Get the rate for your field: build a program and FieldMarshal gives you the exact per-acre rate for your crop from the label line.
Plant-back and rotation
Your interval depends on your application rate and the rotational crop.
Get the interval for your rotation: build a program and FieldMarshal gives you the exact plant-back for your rotational crop from the label line.
Fierce MTZ FAQ
What weeds does Fierce MTZ control?
The Fierce MTZ label names 73 weeds, including palmer amaranth, spiny amaranth, spurred anoda, common barnyardgrass, florida beggarweed, and annual bluegrass. Control varies by crop, rate, and timing.
What crops is Fierce MTZ labeled for?
Fierce MTZ is labeled for 3 crops and uses, including field corn, soybeans, and fallow.
What is the active ingredient in Fierce MTZ? Is it a generic?
Fierce MTZ's active ingredient is flumioxazin, metribuzin, and pyroxasulfone (MOA Group 5, 14, and 15). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.
Sources
Last updated 2026-09-30.