Table 2.2-14. Postemergence herbicide application restrictions for corn.
| Herbicide | Over-the-top application | Use of drop nozzles | Comments |
|---|---|---|---|
| 2,4-D | < 8" tall | 0.5 pt - 8" to 36" tall | Some 2,4-D formulations allow application up to tasseling. |
| Accent | 20" tall (free standing) or < 6 collars (V6 stage) |
20" to 36" tall or V6 to V10 stage |
- |
| Aim | Up to 8-leaf collar stage (V8) | Up to 14-leaf collar stage | Use drop nozzles or directed sprayers that target weeds but spray away from the corn whorl. |
| Atrazine | 12" tall | - | - |
| Banvel or Clarity |
1 pt-8" tall or 5 leaves 0.5pt-8" to 36" tall or 15 days before tassel emergence |
- | Do not apply Banvel or Clarity near soybeans if corn is >24" tall, or if soybeans are >10" tall or have begun to bloom. |
| Basagran | No restrictions | - | - |
| Basis | Spike to 4 leaves (2 collars) or 0.5" to 6" tall | - | Do not apply to corn >6" tall or having 3 collars. |
| Basis Gold | Up to 12" tall (6 collars) | - | Do not apply to corn >12" tall or exhibiting 6 collars |
| Beacon | 4" to 20" tall (free-standing) | For splits, 20" tall to before tassel emergence | - |
| Buctril | 1 pt - emergence to tassel, 1.5 pts - 4 leaves to tassel | - | Postemergence application before 3-leaf stage may result in corn leaf burn. |
| Butril + atrazine | 1.5 to 2 pts - emergence to 12" tall, 3 pt - 4leaves to <12" tall | - | Postemergence application before 3-leaf stage may result in corn leaf burn. |
| Callisto | Up to 30" tall (or 8-corn leaf stage) | - | - |
| Celebrity Plus | 4" to 24" tall (free standing) or <6 collars (V6 stage) | When necessary | - |
| Curtail | <8″ tall | - | - |
| Distinct | 4" to 24" tall | 24" to 30" tall | Up to 2 weekds before tassel emergence |
| Equip | Up to 12" tall | >12" to 36" tall (>V6 but <V8 growth stage) | - |
| Exceed | 4" to 20" tall or 6 collars | >20" to 30" tall | - |
| Glyphosate products | Up to 30" tall (V8 stage) | - | Apply to Roundup Ready hybrids only. |
| Harmony GT | 2 to 6 leaves up to 12" tall (1 to 4 collars) | - | Do not apply to corn >12" tall or having 4 collars. |
| Hornet | Emergence up to 20″ tall (V6) | 20″-36″ (V6) | - |
| Impact | Up to 45 days prior to corn harvest | When necessary | - |
| Laddok S-12 | Spike to 7 leaves or up to 12" tall | - | - |
| Liberty | Emergence up to 24" tall or 7 collars (whichever comes first) | >20" to 36" tall | Apply to Liberty Link or GR corn hybrids only. |
| Liberty ATZ | Emergence to 12" tall | - | Apply to Liberty Link or GR corn hybrids only. |
| Lightning | Up to 20" tall | When necessary | Apply to IMI or CL corn hybrids only. Do no apply within 45 days of corn harvest. |
| Marksman | Emergence to 5-leaf stage or up to 8" tall | - | - |
| NorthStar | 4" to 20" or 6 collars | >20" to 30" tall | - |
| Option | Emergence to 16" (V5 stage) | >16" to 36" tall | - |
| Permit | Spike to 48" tall | When necessary | If tank-mixed: with 2,4-D, apply to corn up to 8" tall; with Banvel or Clarity, apply to corn up to 36" tall. |
| Pursuit | No restrictions on label | When necessary | Apply to IMI or CL corn hybrids only. If tank-mixed, use most restrictive application timing. |
| Ready Master ATZ | Up to 12" tall | - | Apply to Roundup Ready hybrids only. |
| Resolve | Up to 12″ tall (<6 collars) | - | - |
| Resource | 2-leaf to 10-leaf stage (collars must be visible) | When necessary, to direct below corn leaves | - |
| Roundup products | Up to 30" tall (V8 stage) | - | Apply to Roundup Ready hybrids only. |
| Sencor | Emergence to pretassel | When necessary | See tank-mix partner. |
| Shotgun | Spike to 4 leaves or up to 8" tall | 5 leaves or 8" to 12" tall | - |
| Spirit | 4" to 20" tall or 6 collars | >20" to 24" tall | - |
| Steadfast | Up to 12" tall (6 collars) | - | - |
| Steadfast ATZ | Up to 12" tall (6 collars) | - | - |
| Stout | Up to 16″ tall (<6 collars) | - | - |
| Touchdown | Emergence through V8 stage | - | Apply to Roundup Ready hybrids only. |
| Tough | No restrictions on label | When necessary | Best to apply before 4-leaf stage of weeds, but can vary with tank-mix partner. |
| Yukon | Spike to 36" tall | When necessary | - |