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BlackHawk® herbicide is a strong pre-seed burndown solution for battling tough weeds like Group 2- and glyphosate-resistant kochia, cleavers, and volunteer canola in cereals and soybeans.


Active ingredients:  Group 14 (pyraflufen-ethyl) , Group 4 (2,4-D ester)
Rainfast:  1 hour
Treatment rates:  300 mL/ac. – one case treats 60 acres, one drum treats 320 acres, and one tote treats 1,600 acres
Tank-mix order:  BlackHawk, glyphosate
Notes:  Cereals can be seeded immediately following application (except oats) . Can be applied up to 3 days after seeding soybeans (ensure soybeans are seeded minimum 1 inch depth). Coverage of emerged weeds is key for contact activity.

Registered crops


  • Barley
  • Canary seed
  • Field corn
  • Oats (apply 7 days prior to seeding)
  • Rye (spring, fall)
  • Soybeans (apply a maximum of 3 days after seeding)
  • Summerfallow
  • Triticale
  • Wheat (spring, winter, durum)

Weeds controlled

  • Cleavers (all herbicide-resistant biotypes)
  • Cocklebur
  • Cow cockle (suppression)
  • Dandelion (spring seedling and season long suppression)
  • Flixweed
  • Kochia (including Group 2 and glyphosate-resistant biotypes)
  • Lamb’s-quarters (including Group 2- and Group 5-resistant biotypes)
  • Mustards (except dog and tansy)
  • Narrow-leaved hawk’s-beard (including Group 2-resistant biotypes)
  • Night-flowering catchfly
  • Pigweed (redroot and Russian)
  • Prickly lettuce
  • Russian thistle
  • Shepherd’s-purse
  • Stinkweed
  • Sweet clover
  • Volunteer canola (including all herbicide-resistant biotypes)
  • Wild buckwheat (suppression)
  • Wild radish


for enhanced control of these additional weeds

  • Canada thistle
  • Chickweed
  • Dandelion
  • Sow thistle
  • Volunteer canola (including all herbicide-resistant biotypes)
  • Wild buckwheat

Weed Control Control Challenge

Growing weed resistance, especially to glyphosate

Glyphosate alone used to provide an effective burndown option in cereal crops. But the widespread adoption of glyphosate-tolerant canola, and the alarming spread of glyphosate- and Group 2-resistant kochia, has dramatically reduced the effectiveness of glyphosate-only control programs.

Nufarm Solution

Two modes of action for excellent weed control

BlackHawk® herbicide contains a Group 14 herbicide (pyraflufen-ethyl) in a pre-formulation with 2,4-D ester. It delivers faster, more complete weed control in a cereal pre‑seed burndown than glyphosate and Group 2 herbicides. With two active ingredients and two modes of action, BlackHawk is an innovative burndown solution that doubles as an effective tool for resistance management.


  • Proven resistance management with two non-Group 2 modes of action that target broadleaf weeds
  • Faster control through systemic and contact activity
  • Better performance compared to glyphosate alone for pre-seed burndown


  • Makes in-crop weed control easier and more effective by having only new, small weeds present at time of application
  • Provides broad-spectrum weed control, including excellent control of narrow-leaved hawk’s-beard in the fall and at 1-2 leaf in spring
  • Pre-seed burndown applications are known to increase crop yield by up to 25%*
  • Effective fall weed control
  • No surfactant needed when applied with glyphosate


* O’Donovan et al. 1985, Sapsford et al. 2008