Herbicide label
QUINSTAR 4L Herbicide Label
QUINSTAR 4L (EPA 42750-169) is a Group 4 quinclorac herbicide labeled for 6 crops. The label lists 20 controlled weeds, plus partial-control, suppression, and partner-control categories.
“QUINSTAR® 4L is a systemic herbicide with plant uptake occurring through both the foliage and roots.”
QUINSTAR 4L label facts
- Product QUINSTAR 4L
- EPA Reg. No. 42750-169
- Registrant Albaugh, LLC
- Active ingredient quinclorac
- MOA group 4
Crops on the QUINSTAR 4L label
QUINSTAR 4L is labeled for these 6 crops and uses, per the EPA label.
Weeds on the QUINSTAR 4L label
The QUINSTAR 4L label names 33 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 control20- alligatorweed
- barnyardgrass, common
- crabgrass, large
- eclipta
- sesbania, hemp
- jointvetches
- junglerice
- morningglory
- signalgrass, broadleaf
- bedstraw, catchweed
- bindweed, field
- bindweed, hedge
- dodder
- foxtail, giant
- foxtail, green
- foxtail, yellow
- prickly lettuce
- spurge, leafy
- thistle, canada
- yellow loosestrife
Suppression
suppression9- dandelion
- kochia
- lambsquarters, common
- ragweed, common
- ragweed, giant
- sowthistle, perennial
- sunflower, wild
- thistle, russian
- velvetleaf
Controls with a tank-mix partner
needs partner4- cocklebur, common
- dayflower
- nutsedge, yellow
- sprangletop
QUINSTAR 4L 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.
QUINSTAR 4L FAQ
What weeds does QUINSTAR 4L control?
The QUINSTAR 4L label names 33 weeds, including alligatorweed, common barnyardgrass, large crabgrass, eclipta, hemp sesbania, and jointvetches. Control varies by crop, rate, and timing.
What crops is QUINSTAR 4L labeled for?
QUINSTAR 4L is labeled for 6 crops and uses, including wheat, sorghum, rice, fallow, and grass seed.
What is the active ingredient in QUINSTAR 4L? Is it a generic?
QUINSTAR 4L's active ingredient is quinclorac (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.