Herbicide label
Empyros Triad
Empyros Triad (EPA 5905-640) is a Group 5, 15, and 27 atrazine, metolachlor, and tolpyralate herbicide labeled for 5 crops. The label lists 63 controlled weeds, plus partial-control, suppression, and partner-control categories.
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Empyros Triad label facts
- Product Empyros Triad
- EPA Reg. No. 5905-640
- Registrant Helena Agri-Enterprises, LLC, d/b/a Helena Chemical Comp
- Active ingredient atrazine, metolachlor, and tolpyralate
- MOA group 5, 15, and 27
Crops on the Empyros Triad label
Empyros Triad is labeled for these 5 crops and uses, per the EPA label.
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Weeds on the Empyros Triad label
The Empyros Triad label names 78 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 control63- amaranth, palmer
- amaranth, powell
- barnyardgrass, common
- beggarweed, florida
- buckwheat, wild
- buffalobur
- carpetweed
- chickweed, common
- crabgrass
- crabgrass, large
- crowfootgrass
- cupgrass, prairie
- cupgrass, southwestern
- cupgrass, woolly
- deadnettle, purple
- devil's-claw
- foxtail, giant
- foxtail, green
- foxtail, robust
- foxtail, yellow
- galinsoga
- goosegrass
- hemp
- henbit
- horsenettle
- horseweed
- jimsonweed
- kochia
- lambsquarters, common
- mallow, venice
- foxtail, millet
- mustard, blue
- mustard, wild
- nightshade, black
- nightshade, eastern black
- nightshade, hairy
- nutsedge, yellow
- panicum, browntop
- panicum, fall
- pigweed, redroot
- pigweed, smooth
- pokeweed, common
- potatoes, volunteer
- purslane, common
- pusley, florida
- radish, wild
- ragweed, common
- ragweed, giant
- red rice
- sesbania, hemp
- shepherd's-purse
- sida, prickly
- signalgrass, narrowleaf
- smartweed, ladysthumb
- smartweed, pennsylvania
- sowthistle, annual
- sprangletop, red
- starbur, bristly
- sunflower, volunteer
- thistle, canada
- velvetleaf
- waterhemp, common
- witchgrass
Partial control
partial16- bedstraw, catchweed
- cocklebur, common
- dandelion
- johnsongrass, seedling
- horseweed
- millet, wild-proso
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, tall
- panicum, texas
- puncturevine
- sandbur, field
- shattercane
- sicklepod
- signalgrass, broadleaf
- sunflower, annual
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Empyros Triad 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 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.
Empyros Triad FAQ
What weeds does Empyros Triad control?
The Empyros Triad label names 78 weeds, including palmer amaranth, powell amaranth, common barnyardgrass, florida beggarweed, wild buckwheat, and buffalobur. Control varies by crop, rate, and timing.
What crops is Empyros Triad labeled for?
Empyros Triad is labeled for 5 crops and uses, including field corn, seed corn, corn silage, sweet corn, and popcorn.
What is the active ingredient in Empyros Triad? Is it a generic?
Empyros Triad's active ingredient is atrazine, metolachlor, and tolpyralate (MOA Group 5, 15, and 27). 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 Empyros Triad?
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 Empyros Triad?
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.
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Sources
Last updated 2026-07-14.