Herbicide label
QUINSTAR 4L
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.
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“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.
Need the rate or timing for one of these? Filter every label by your crop, free.
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
- bedstraw, catchweed
- bindweed, field
- bindweed, hedge
- crabgrass, large
- dodder
- eclipta
- foxtail, giant
- foxtail, green
- foxtail, yellow
- sesbania, hemp
- jointvetches
- junglerice
- prickly lettuce
- morningglory
- signalgrass, broadleaf
- spurge, leafy
- thistle, canada
- yellow loosestrife
Partial control
partial1- alligatorweed
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
- sprangletop
- nutsedge, yellow
Want the control level for your crop, or to filter 1,700+ labels by any of these weeds? Use the free label filter.
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 and your soil texture.
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, the rotational crop, and your state, region, and rainfall — some intervals differ in CO, DE, ID, IL, KS, MD, MN, MO, MT, ND, NE, NM, NV, OK, OR, PA, SD, TX, UT, VA, WA, and WY.
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, catchweed bedstraw, field bindweed, hedge bindweed, and large crabgrass. 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.
What's the plant-back interval after QUINSTAR 4L?
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 QUINSTAR 4L?
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 QUINSTAR 4L and let FieldMarshal build a defensible herbicide program for your field, every product, rate, and plant-back cross-referenced and checked against the label.
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Sources
Last updated 2026-07-14.