Herbicide label
RT Master II Herbicide Label
RT Master II (EPA 524-539) is a Group 9 glyphosate herbicide labeled for 23 crops. The label lists 87 controlled weeds, plus partial-control, suppression, and partner-control categories.
RT Master II label facts
- Product RT Master II
- EPA Reg. No. 524-539
- Registrant Bayer CropScience
- Active ingredient glyphosate
- MOA group 9
Crops on the RT Master II label
RT Master II is labeled for these 23 crops and uses, per the EPA label.
Weeds on the RT Master II label
The RT Master II label names 101 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 control87- alfalfa
- barley
- barnyardgrass, common
- bindweed, field
- bittercress
- bluegrass, annual
- bluegrass, bulbous
- blueweed, texas
- brome, downy
- brome, japanese
- bromegrass, smooth
- buckwheat, wild
- buttercup
- cheat
- chickweed
- cocklebur, common
- coreopsis, plains
- corn, volunteer
- crabgrass
- dock, curly
- dwarfdandelion
- filaree, broadleaf
- fleabane, hairy
- foxtail
- foxtail, bristly
- foxtail, giant
- foxtail, green
- foxtail, yellow
- carolina geranium
- goatgrass, jointed
- grain sorghum
- groundcherry
- groundsel, common
- henbit
- horseweed
- johnsongrass
- johnsongrass, seedling
- kochia
- lambsquarters
- millet, wild-proso
- morning glory, annual
- mullein, common
- mustard, blue
- mustard, tansy
- mustard, tumble
- mustard, wild
- nightshade, black
- nightshade, hairy
- nightshade, silverleaf
- oats
- wild oats
- panicum, fall
- panicum, texas
- pennycress, field
- pigweed
- pigweed, redroot
- prickly lettuce
- pusley, florida
- quackgrass
- rocket, london
- cereal rye
- rye, common
- rye, volunteer
- ryegrass
- ryegrass, perennial
- sandbur, field
- sandbur, longspine
- sesbania, hemp
- shattercane
- shepherd's-purse
- sicklepod
- sowthistle, annual
- sprangletop
- spurge, prostrate
- spurge, spotted
- starbur, bristly
- stinkgrass
- sunflower
- swinecress
- thistle, canada
- thistle, russian
- velvetleaf
- wheat
- wheat, overwintered
- volunteer wheat
- wheatgrass, western
- witchgrass
Suppression
suppression10- beggarweed, florida
- bermudagrass
- dogbane, hemp
- dogfennel
- guineagrass
- milkweed
- ragweed, giant
- smutgrass
- thistle, musk
- vaseygrass
Controls with a tank-mix partner
needs partner5- ragweed, common
- ragweed, giant
- smartweed, pennsylvania
- spurge, leafy
- signalgrass, broadleaf
RT Master II 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.
RT Master II FAQ
What weeds does RT Master II control?
The RT Master II label names 101 weeds, including alfalfa, barley, common barnyardgrass, field bindweed, bittercress, and annual bluegrass. Control varies by crop, rate, and timing.
What crops is RT Master II labeled for?
RT Master II is labeled for 23 crops and uses, including field corn, soybeans, wheat, cotton, and sunflower.
What is the active ingredient in RT Master II? Is it a generic?
RT Master II's active ingredient is glyphosate (MOA Group 9). 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.