Herbicide label
Observe Herbicide Label
Observe (EPA 100-1173) is a Group 1 clodinafop-propargyl herbicide labeled for 2 crops. The label lists 10 controlled weeds, plus partial-control, suppression, and partner-control categories.
Observe label facts
- Product Observe
- EPA Reg. No. 100-1173
- Registrant Syngenta Crop Protection, LLC
- Active ingredient clodinafop-propargyl
- MOA group 1
Crops on the Observe label
Observe is labeled for these 2 crops and uses, per the EPA label.
Weeds on the Observe label
The Observe label names 10 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 control10- barnyardgrass, common
- canarygrass
- corn, volunteer
- darnel, persian
- foxtail, giant
- foxtail, green
- foxtail, yellow
- oat, volunteer
- wild oats
- ryegrass, italian
Observe 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.
Observe FAQ
What weeds does Observe control?
The Observe label names 10 weeds, including common barnyardgrass, canarygrass, volunteer corn, persian darnel, giant foxtail, and green foxtail. Control varies by crop, rate, and timing.
What crops is Observe labeled for?
Observe is labeled for 2 crops and uses, including wheat and durum wheat.
What is the active ingredient in Observe? Is it a generic?
Observe's active ingredient is clodinafop-propargyl (MOA Group 1). 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.