Herbicide label
Orion Herbicide Label
Orion (EPA 100-1307) is a Group 2 and 4 florasulam and mcpa herbicide labeled for 6 crops. The label lists 30 controlled weeds, plus partial-control, suppression, and partner-control categories.
“Orion Herbicide contains the active ingredients florasulam which inhibits acetolactate synthase (ALS, Site of Action Group 2) and MCPA which causes abnormal cell growth (synthetic auxin, Site of Action Group 4).”
Orion label facts
- Product Orion
- EPA Reg. No. 100-1307
- Registrant Syngenta Crop Protection, LLC
- Active ingredient florasulam and mcpa
- MOA group 2 and 4
Crops on the Orion label
Orion is labeled for these 6 crops and uses, per the EPA label.
Weeds on the Orion label
The Orion label names 37 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 control30- buckwheat, wild
- volunteer canola
- chamomile, corn
- chamomile, false
- mayweed, chamomile
- chamomile, wild
- chickweed, common
- cleavers
- fiddleneck
- flixweed
- hempnettle
- knotweed
- lambsquarters
- rocket, london
- mustard, black
- mustard, blue
- mustard, tansy
- mustard, treacle
- mustard, tumble
- mustard, wild
- pennycress, field
- pigweed, redroot
- pineapple-weed
- prickly lettuce
- ragweed, common
- shepherd's-purse
- smartweed, green
- smartweed, ladysthumb
- smartweed, pennsylvania
- sunflower, annual
Suppression
suppression7- burdock
- dandelion
- filaree, redstem
- plantain
- sowthistle, annual
- sowthistle, perennial
- thistle, canada
Orion 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.
Orion FAQ
What weeds does Orion control?
The Orion label names 37 weeds, including wild buckwheat, volunteer canola, corn chamomile, false chamomile, chamomile mayweed, and wild chamomile. Control varies by crop, rate, and timing.
What crops is Orion labeled for?
Orion is labeled for 6 crops and uses, including wheat, barley, durum wheat, oats, and cereal rye.
What is the active ingredient in Orion? Is it a generic?
Orion's active ingredient is florasulam and mcpa (MOA Group 2 and 4). Other products list the same active ingredient; rates, formulations, and labeled crops differ — verify each on its own label.
Sources
Last updated 2026-09-17.