Herbicide label
WeedMaster Herbicide Label
WeedMaster (EPA 71368-34) is a Group 4 2,4-d and dicamba herbicide labeled for 16 crops. The label lists 69 controlled weeds, plus partial-control, suppression, and partner-control categories.
“This product contains two active ingredients: dicamba and 2,4-D. This herbicide is readily absorbed by plants through shoot and root uptake, translocates throughout the plant's system, and accumulates in areas of active growth.”
WeedMaster label facts
Crops on the WeedMaster label
WeedMaster is labeled for these 16 crops and uses, per the EPA label.
Weeds on the WeedMaster label
The WeedMaster label names 84 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 control69- alfalfa
- amaranth, palmer
- bindweed, field
- bindweed, hedge
- bittercress
- buckwheat, wild
- buffalobur
- burdock
- buttercup
- carrot, wild
- chickweed, common
- cockle, cow
- cocklebur, common
- coreopsis, plains
- crabgrass
- croton, woolly
- dandelion, common
- devilsclaw
- dock, curly
- dogfennel
- eveningprimrose, cutleaf
- fleabane, annual
- flixweed
- goosegrass
- groundsel, texas
- henbit
- knotweed, prostrate
- kochia
- lambsquarters, common
- mallow, common
- horseweed
- mayweed
- morningglory, ivyleaf
- morningglory, tall
- mustard, annual
- mustard, tansy
- nightshade, black
- pennycress, field
- pepperweed, virginia
- pigweed, prostrate
- pigweed, redroot
- pigweed, rough
- pigweed, smooth
- pigweed, tumble
- poorjoe
- purslane, common
- ragweed, common
- ragweed, lanceleaf
- ragweed, western
- ragwort, tansy
- sage, lanceleaf
- salsify, western
- sedge
- shepherd's-purse
- signalgrass, broadleaf
- smartweed, pennsylvania
- sneezeweed, bitter
- sorrel, red
- sowthistle
- sowthistle, annual
- starthistle, yellow
- sunflower, annual
- thistle, bull
- thistle, musk
- thistle, plumeless
- thistle, russian
- velvetleaf
- vetch, hairy
- waterhemp, common
Partial control
partial1- thistle, canada
Suppression
suppression11- buckeye species
- bullnettle
- dewberry, southern
- horsenettle
- knapweed, black
- knapweed, russian
- milkweed, antelopehorn
- nightshade, silverleaf
- redvine
- sowthistle, perennial
- spurge, leafy
Controls with a tank-mix partner
needs partner3- blackberry
- dewberry
- mesquite
WeedMaster 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.
WeedMaster FAQ
What weeds does WeedMaster control?
The WeedMaster label names 84 weeds, including alfalfa, palmer amaranth, field bindweed, hedge bindweed, bittercress, and wild buckwheat. Control varies by crop, rate, and timing.
What crops is WeedMaster labeled for?
WeedMaster is labeled for 16 crops and uses, including field corn, soybeans, wheat, cotton, and barley.
What is the active ingredient in WeedMaster? Is it a generic?
WeedMaster's active ingredient is 2,4-d and dicamba (MOA Group 4). 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.