According to the label From the product label
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EPA registration data for Reg. 5481-646 →
Assure II is a systemic herbicide used for the control of various annual and perennial grasses. The active ingredient is Quizalofop-p-ethyl (10.3% by weight), which works by inhibiting the enzyme acetyl-CoA carboxylase (ACCase) in grasses. It is designed for use on various crops, including corn, soybeans, wheat, and more, as well as non-crop areas like fence rows and roadsides. The product can be applied as a solo application or tank-mixed with broadleaf herbicides, though specific precautions apply. For spot treatments of small areas, a 0.375% v/v solution is required using either a crop oil concentrate or a nonionic surfactant. Users should be aware that the product contains petroleum distillates; avoid contact with eyes, skin, or clothing, and do not induce vomiting if swallowed. It is critical to follow weed resistance management practices, such as rotating herbicides with different modes of action, to prevent resistance development.
Pests covered (1)
Annual and perennial grasses
Areas treatable (1)
Crops (e.g., corn, soybeans, wheat, etc.) and non-crop areas (e.g., fence rows, roadsides)
Application instructions from the label 1
Crops (e.g., corn, soybeans, wheat, etc.) and non-crop areas (e.g., fence rows, roadsides)
Systemic herbicide; controls grasses by inhibiting ACCase.
- Target pest
- Annual and perennial grasses
- Location
- Both
Mixing instructions 1
| For pests |
Location |
Per |
Finished strength |
Label notes |
| Small area spot treatments |
Outdoor |
1 gallon |
0.375% v/v |
Use either 1.25 fl oz crop oil concentrate OR 0.3 fl oz nonionic surfactant per gallon of water. |
Worker safety
Re-entry interval (REI)
12
PPE required
Long-sleeved shirt and long pants, chemical-resistant gloves (barrier laminate or Viton ≥14 mils), shoes plus socks, and protective eyewear.
Timing & weather
- Avoid applying when rainfall is forecast to occur within 48 hours.
- Avoid applying to grasses under stress (e.g., drought, temperature extremes).
Use restrictions 4
- Do not feed forage, hay, or straw from treated areas to livestock unless otherwise stated.
- Do not apply through irrigation equipment.
- Do not contaminate any body of water.
- Do not use on lawns, walks, driveways, tennis courts, or similar areas.
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