Herbicide label
Stark Ultra Herbicide Label
Stark Ultra (EPA 91234-45) is a Group 4 fluroxypyr 1-methylheptyl ester herbicide labeled for 13 crops. The label lists 21 controlled weeds, plus partial-control, suppression, and partner-control categories.
Stark Ultra label facts
- Product Stark Ultra
- EPA Reg. No. 91234-45
- Registrant Atticus, LLC
- Active ingredient fluroxypyr 1-methylheptyl ester
- MOA group 4
Crops on the Stark Ultra label
Stark Ultra is labeled for these 13 crops and uses, per the EPA label.
Weeds on the Stark Ultra label
The Stark Ultra label names 34 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 control21- bedstraw, catchweed
- chickweed
- jimsonweed
- potato, volunteer
- purslane, common
- bindweed, hedge
- cocklebur, common
- dogbane, hemp
- kochia
- mallow, venice
- morningglory
- puncturevine
- ragweed, common
- ragweed, giant
- sunflower
- velvetleaf
- clover, white
- coffeeweed
- volunteer flax
- grape
- prickly lettuce
Suppression
suppression13- marshelder
- bindweed, field
- buckwheat, wild
- devilsclaw
- horseweed
- mustard
- nightshade, black
- pennycress, field
- thistle, russian
- volunteer canola
- horsetail, field
- knotweed
- mallow, common
Stark Ultra 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.
Stark Ultra FAQ
What weeds does Stark Ultra control?
The Stark Ultra label names 34 weeds, including catchweed bedstraw, chickweed, jimsonweed, volunteer potato, common purslane, and hedge bindweed. Control varies by crop, rate, and timing.
What crops is Stark Ultra labeled for?
Stark Ultra is labeled for 13 crops and uses, including field corn, wheat, barley, sorghum, and oats.
What is the active ingredient in Stark Ultra? Is it a generic?
Stark Ultra's active ingredient is fluroxypyr 1-methylheptyl ester (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.