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EPA registration data for Reg. 5481-524 →
IMPACT is a systemic herbicide used for the selective control or growth suppression of emerged broadleaf and grass weeds in corn (including field corn, seed corn, popcorn, and sweet corn). The active ingredient is Topramezone (0.044 lb per fl oz). It works by inhibiting carotenoid biosynthesis (HPPD inhibitor, Group 27). It can be used in both conservation and conventional tillage crop production systems. For optimal results, apply to emerged weeds that are actively growing and before they exceed labeled maximum sizes. The product can be applied as a single or sequential application, up to 45 days prior to corn harvest. It can also be tank-mixed with other herbicides to provide a broader spectrum of control. Note that IMPACT applications should include recommended spray additives for best performance. Always follow specific directions for tank-mixing and use appropriate nozzles to ensure adequate coverage and minimize drift.
Pests covered (2)
emerged broadleaf and grass weedsBroadleaf Weeds
Areas treatable (1)
corn (field corn, seed corn, popcorn, and sweet corn)
How to treat each type of area 1
corn (field corn, seed corn, popcorn, and sweet corn)
emerged weeds actively growing
| Target pest |
Location |
Rate |
Unit |
Label notes |
| emerged broadleaf and grass weeds |
Outdoor |
0.75 to 2.0 fl oz per acre |
fl oz per acre |
Apply before weeds exceed labeled maximum size. Do not apply within 30 feet of sensitive plant community. |
Mixing instructions 1
| For pests |
Amount |
Per |
Label notes |
| broadleaf and grass weeds |
up to 2.0 fl oz |
per acre |
May be tank-mixed with other herbicides. Use recommended spray additives. When mixing with atrazine, use MSO or HSMOC adjuvants. |
Worker safety
Re-entry interval (REI)
12
PPE required
Long-sleeved shirt and long pants; chemical-resistant gloves (barrier laminate, polyethylene, Viton ≥14 mils, rubber ≥14 mils, or polyvinyl chloride ≥14 mils); shoes plus socks.
Timing & weather
- Do not apply during temperature inversions. Do not apply when wind speeds exceed 10 mph. Apply to actively growing weeds.
Use restrictions 1
- Do not apply within 30 feet of sensitive plant community. Do not apply when wind speeds exceed 10 mph or during temperature inversions. Do not apply directly to water or areas where surface water is present. Avoid disturbing treated areas for at least 7 days after application.
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