Herbicide label
Empyros Triad Flex Herbicide Label
Empyros Triad Flex (EPA 5905-642) is a Group 5, 15, and 27 atrazine, metolachlor, and tolpyralate herbicide labeled for 5 crops. The label lists 62 controlled weeds, plus partial-control, suppression, and partner-control categories.
Empyros Triad Flex label facts
- Product Empyros Triad Flex
- EPA Reg. No. 5905-642
- 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 Flex label
Empyros Triad Flex is labeled for these 5 crops and uses, per the EPA label.
Weeds on the Empyros Triad Flex label
The Empyros Triad Flex label names 77 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 control62- 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, 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
- velvetleaf
- thistle, canada
- waterhemp, common
- witchgrass
Partial control
partial15- bedstraw, catchweed
- cocklebur, common
- johnsongrass, seedling
- millet, wild-proso
- morningglory, entireleaf
- morningglory, ivyleaf
- morningglory, tall
- panicum, texas
- puncturevine
- sandbur, field
- shattercane
- shattercane, volunteer sorghum
- signalgrass, broadleaf
- sunflower, annual
- sunflower, wild
Empyros Triad Flex 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.
Empyros Triad Flex FAQ
What weeds does Empyros Triad Flex control?
The Empyros Triad Flex label names 77 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 Flex labeled for?
Empyros Triad Flex 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 Flex? Is it a generic?
Empyros Triad Flex'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.
Sources
Last updated 2026-09-30.