Herbicide label

PRIORITY 8E Herbicide Label

PRIORITY 8E (EPA 42750-340) is a Group 15 metolachlor herbicide labeled for 12 crops. The label lists 23 controlled weeds, plus partial-control, suppression, and partner-control categories.

PRIORITY 8E label facts

Crops on the PRIORITY 8E label

PRIORITY 8E is labeled for these 12 crops and uses, per the EPA label.

Weeds on the PRIORITY 8E label

The PRIORITY 8E label names 62 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 control23
  • barnyardgrass, common
  • carpetweed
  • crabgrass
  • crowfootgrass
  • cupgrass, prairie
  • cupgrass, southwestern
  • foxtail, bristly
  • foxtail, giant
  • foxtail, green
  • foxtail, millet
  • foxtail, robust
  • foxtail, yellow
  • galinsoga
  • goosegrass
  • nightshade, eastern black
  • nutsedge, yellow
  • panicum, fall
  • pigweed
  • pusley, florida
  • red rice
  • signalgrass
  • waterhemp, common
  • witchgrass

Partial control

partial15
  • beggarweed, florida
  • cocklebur, common
  • cupgrass, woolly
  • eclipta
  • jimsonweed
  • johnsongrass, seedling
  • millet, wild-proso
  • morningglory
  • nightshade, hairy
  • panicum, texas
  • purslane, common
  • sandbur
  • shattercane
  • sorghum, volunteer
  • velvetleaf

Controls with a tank-mix partner

needs partner31
  • cocklebur, common
  • purslane, common
  • nightshade, hairy
  • lambsquarters
  • morningglory
  • panicum, browntop
  • ragweed, giant
  • smartweed
  • velvetleaf
  • jimsonweed
  • kochia
  • mustard
  • sida, prickly
  • spurge, annual
  • sandbur, field
  • johnsongrass, seedling
  • purslane
  • stinging nettle
  • spurge, hyssop
  • spurge, nodding
  • spurge, prostrate
  • spurge, spotted
  • coffeeweed
  • groundcherry
  • junglerice
  • mallow
  • morning glory, annual
  • wild oats
  • sesbania, hemp
  • mallow, venice
  • mustard, wild

PRIORITY 8E 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.

PRIORITY 8E FAQ

What weeds does PRIORITY 8E control?

The PRIORITY 8E label names 62 weeds, including common barnyardgrass, carpetweed, crabgrass, crowfootgrass, prairie cupgrass, and southwestern cupgrass. Control varies by crop, rate, and timing.

What crops is PRIORITY 8E labeled for?

PRIORITY 8E is labeled for 12 crops and uses, including field corn, soybeans, cotton, potato, and peanut.

What is the active ingredient in PRIORITY 8E? Is it a generic?

PRIORITY 8E's active ingredient is metolachlor (MOA Group 15). 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.