Herbicide label
GR2
GR2 (EPA 279-9631) is a Group 2 pyroxsulam herbicide labeled for 4 crops. The label lists 42 controlled weeds, plus partial-control, suppression, and partner-control categories.
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GR2 label facts
- Product GR2
- EPA Reg. No. 279-9631
- Registrant FMC Corporation
- Active ingredient pyroxsulam
- MOA group 2
Crops on the GR2 label
GR2 is labeled for these 4 crops and uses, per the EPA label.
Need the rate or timing for one of these? Filter every label by your crop, free.
Weeds on the GR2 label
The GR2 label names 54 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 control42- barnyardgrass, common
- blackgrass
- bluegrass, bulbous
- brome, japanese
- brome, ripgut
- cheat
- chess, hairy
- corn, volunteer
- darnel, persian
- foxtail, yellow
- wild oats
- ryegrass, italian
- windgrass, common
- bedstraw, catchweed (cleavers)
- bittercress, hairy
- burclover, spotted
- buttercup, smallflower
- canola, volunteer (wild turnip)
- chickweed, common
- chickweed, mouseear
- clover, white
- falseflax, smallseed
- fiddleneck
- flixweed
- carolina geranium
- gromwell, corn
- hempnettle, common
- lambsquarters, common
- mustard, black
- mustard, blue
- mustard, tumble
- mustard, wild
- mustard, wormseed
- pennycress, field
- pepperweed, virginia
- pigweed, redroot
- shepherd's-purse
- smartweed, annual
- tansymustard, pinnate
- thistle, russian
- vetch, hairy
- wallflower, bushy
Suppression
suppression12- foxtail barley
- brome, downy
- canarygrass, hood
- canarygrass, littleseed
- rattail fescue
- foxtail, green
- quackgrass
- rescuegrass
- buckwheat, wild
- coreopsis, plains
- evening-primrose, cutleaf
- henbit
Want the control level for your crop, or to filter 1,700+ labels by any of these weeds? Use the free label filter.
GR2 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.
GR2 FAQ
What weeds does GR2 control?
The GR2 label names 54 weeds, including common barnyardgrass, blackgrass, bulbous bluegrass, japanese brome, ripgut brome, and cheat. Control varies by crop, rate, and timing.
What crops is GR2 labeled for?
GR2 is labeled for 4 crops and uses, including wheat, winter wheat, durum wheat, and triticale.
What is the active ingredient in GR2? Is it a generic?
GR2's active ingredient is pyroxsulam (MOA Group 2). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.
What's the plant-back interval after GR2?
It depends on your rotational crop, application rate, and region, so the label gives a table, not one number. Build a program and FieldMarshal gives you the exact interval for your rotation from the label line, so you can verify it.
Build a program →Can I tank-mix GR2?
It depends on your target weeds, crop stage, and which partners the label approves. Build a program and FieldMarshal checks the label for approved partners and gives the condition on each, so you can verify it.
Build a program →Plan in minutes, not hours.
Start with GR2 and let FieldMarshal build a defensible herbicide program for your field, every product, rate, and plant-back cross-referenced and checked against the label.
Free account and label filter. Building a program is paid, metered by use, so you pay only for what you build.
Sources
Last updated 2026-07-14.