Corn Herbicide Rotation Restrictions to Wheat in Oklahoma
Weed management stands as a cornerstone of successful crop production and is crucial for sustaining agricultural productivity. Herbicides serve as key tools in this regard, aiding producers in controlling weed populations and safeguarding crop health. However, transitioning between crops within a rotation cycle requires careful consideration of herbicide residual effects to prevent potential crop injury and ensure the continued success of the rotation system.
Corn and wheat hold significant importance in Oklahoma crop production as staple crops, each demanding specific herbicide management strategies. As producers transition from corn to wheat, they encounter the challenge of navigating rotational restrictions linked with herbicide applications. These restrictions play a pivotal role in mitigating the risk of herbicide carryover and upholding the life and productivity of subsequent wheat crops.
This publication aims to dig into the importance of herbicide rotational restrictions when transitioning from corn to wheat in Oklahoma. By compiling common herbicides utilized in corn production and their residual impacts on wheat crops, producers can make informed decisions to protect their crops from potential herbicide injury and optimize yields.
Rotational restrictions bear critical significance for various reasons. They not only shield cropping rotations, such as wheat, from the adverse effects of herbicide residues, but they also help in deterring the development of herbicide resistant weeds, preserving the efficacy of herbicides for future use.
The tables below provide a concise overview of frequently used herbicides in Oklahoma corn production, along with their corresponding rotational restrictions for wheat. This allows for simplified access to critical information regarding herbicides for corn. For specific inquiries or detailed information regarding individual chemical compositions, it is advised to refer to the respective product label.
| Herbicide | Component Herbicide | Mode of Action | Wheat Rotational Restrictions | Notes |
|---|---|---|---|---|
| 2, 4-D | 2, 4-D | Growth Regulator | 1 Month | |
| Roundup Power Max | Roundup Power Max | Amino Acid Synthesis Inhibitor | 0 Months | |
| Gramoxone Max | Paraquat | PS Inhibitor | 0 Months | Rotational crops may be planted immediately after the last application |
| Herbicide | Component Herbicide | Mode of Action | Wheat Rotational Restrictions | Notes |
|---|---|---|---|---|
| Aatrex 4L | Atrazine | PS ll Inhibitor | 10-18 Months | If planted the following year, risk remains possible for crop injury |
| Axiom DF | Flufenacet, Metribuzin | Shoot Growth Inhibitor, Photosynthesis Inhibitor (Photosystem ll) | 4 Months | Not for use in popcorn or sweetcorn |
| Balance Flexx | Insoxaflutole | Pigment Synthesis Inhibitor | 4 Months | No minimum precipitation requirements |
| Bicep ll Magnum Cinch ATZ | Metolachlor, Atrazine | Photosynthesis Inhibitor (Photosystem ll), Shoot Growth Inhibitor | 24 Months | |
| Callisto | Mesotrione | Pigment Synthesis Inhibitor | 4 Months | |
| Dual ll Magnum, Cinch | Metolachlor | Shoot Growth Inhibitor | 4.5 Months | |
| Field Master | Acetochlor, Atrazine, Glyphosate | Shoot Growth Inhibitor, Photosynthesis Inhibitor (Photosystem ll), Aromatic Amino Acid Synthesis Inhibitor | If planted the following year, risk remains possible for crop injury | |
| Guardsman Max | Dimethenamid-P, Atrazine | Shoot Growth Inhibitor, Photosynthesis Inhibitor (Photosystem ll) | May be planted after two complete growing seasons | |
| Harness/Surpass/TopNotch/ Warrant | Acetochlor | Shoot Growth Inhibitor | 4 Months | |
| Harness Xtra/ Fulltime | Acetochlor, Atrazine | Shoot Growth Inhibitor (Photosystem ll) | 15 Months | Do not graze or harvest rotational cover crop for food or animals feed for 18 months following the last application of Harness Xtra |
| Hornet WDG | Flumetsulam, Clopyralid | ALS Inhibitor, Growth Regulator | 4 Months | |
| Lumax | Atrazine, S-Metolachlor, Mesotrione | Photosynthesis Inhibitor (Photosystem ll), Shoot Growth Inhibitor | 4.5 Months | |
| Outlook | Dimethenamid- P | Shoot Growth Inhibitor | 4-6 Months | 4 Months at <16 fl oz/acre 6 Months at 16-21 fl oz/acre |
| Princep | Simazine | Photosynthesis Inhibitor (Photosystem ll) | 24 Months | See label for specific crop rotation restrictions |
| Prowl H20 | Pendimethalin | Root Growth Inhibitor | 12-14 Months | Dependent on application rate, rainfall and application timing (spring vs. fall) |
| Pursuit | Imazethapyr | ALS Inhibitor | 4 Months | |
| Python | Flumetsulam | ALS Inhibitor | 4 Months |
| Herbicide | Component Herbicide | Mode of Action | Wheat Rotational Restrictions | Notes |
|---|---|---|---|---|
| 2, 4-D | 2, 4-D | Growth Regulator | 1 Month | |
| Accent | Nicosulfuron | ALS Inhibitor | 4 Months | |
| Alm | Carfentrazone- Ethyl | PPO Inhibitor | 0 Months | |
| Banvel, Clarity, Distinct, Status | Dicamba, diglycolamine, salt | Growth Regulator | See label for specific crop rotation restrictions | |
| Basagran | Bentazon | Photosynthesis Inhibitor (Photosystem ll) | See label for specific crop rotation restrictions | |
| Basis | Rimsulfuron, Thifensulfuron Methyl | ALS Inhibitor | 3-4 Months | 3 Months if applied at 0.33 0.5 fl oz- 4 Months if applied at 0.5 - 1 + fl oz |
| Basis Blend | Rimsulfuron, Thifensulfuron Methly | ALS Inhibitor | 3 Months | |
| Beacon | Primisulfuron-Methyl | ALS Inhibitor | 3 Months | |
| Buctril | Bromoxynil | Photosynthesis Inhibitor (Photosystem ll) | 1 Month | |
| Cadet | Fluthiacet-Methyl | PPO Inhibitor | 0 Months | |
| Callisto | Nicosulfuron, Diflufenzopyr, Dicamba | ALS Inhibitor, Auxin Transport Inhibitor, Growth Regulator | 4-8 Months | 4 Months for Winter Wheat and 8 Months for Spring Wheat |
| Expert | Atrazine, S-Metolachlor, Glyphosate | Photosynthesis Inhibitor (Photosystem ll), Shoot Growth Inhibitor, Aromatic Amino Acid Synthesis Inhibitor | 24 Months | |
| Guardsman Max | Dimethenamid-P, Atrazine | Shoot Growth Inhibitor, Photosynthesis Inhibitor (Photosystem ll) | 24 Months | May be planted after two complete growing seasons |
| Landmaster BW | Glyphosate, 2, 4-D | Aromatic Amino Acid Synthesis Inhibitor, Growth Regulator | 0 Months | |
| Liberty | Glufosinate | Glutamine Synthesis Inhibitor | 2.5 Months | |
| Lumax | Atrazine, S-Metolachlor, Mesotrione | Photosynthesis Inhibitor (Photosystem ll), Shoot Growth Inhibitor | 4.5 Months | |
| Marksman | Atrazine, Dicamba | Photosynthesis Inhibitor (Photosystem ll), Growth Regulator | 10 Months | If planted the following year, there is a possibility for crop injury |
| Northstar | Primisulfuronm Dicamba | ALS Inhibitor, Growth Regulator | 3 Months | |
| Permit | Halosulfuron | ALS Inhibitor | 2 Months | |
| Resource | Flumiclorac | PPO Inhibitor | 4 Months | |
| Roundup Power Max | Glyphosate | Aromatic Amino Acid Inhibitor | 0 Months | |
| Spirit | Prosulfuron, Primisulfuron | ALS Inhibitor | 3 Months | Based on soil pH below 7.8 If soil pH is greater than 7.8 see label |
| Steadfast | Nicosulfuron, Rimsulfuron | ALS Inhibitor | 4 Months | |
| Stinger | Clopyralid | Growth Regulator | 0 Months |