Failed Cotton Herbicide Rotation Restrictions to Sorghum in Oklahoma
Effective weed management is paramount for ensuring successful crop production and sustaining agricultural productivity over time. Herbicides serve as indispensable tools in this endeavor, aiding farmers in controlling weed populations and safeguarding the health of their crops. In Oklahoma, producers have encountered challenges related to failed cotton crops and the subsequent complications arising from herbicide rotation when transitioning to sorghum. Residual herbicides remain active in the soil for an extended period after application, providing ongoing weed control by inhibiting weed seed germination or growth. They are typically used for long-term management in both pre- and post-emergence scenarios. Non-residual herbicides are fast acting and degrade quickly, affecting only the weeds present at the time of application, without providing longterm control. Non-residual herbicides are typically used for immediate control of actively growing weeds.
When cotton crops fail due to various factors such as adverse weather conditions, pest infestations or disease outbreaks, producers often face obstacles in transitioning to sorghum due to the persistence of herbicide residues in the soil. These residual herbicides, originally applied for weed control in cotton, can linger in the soil and disrupt the growth of subsequent crops like sorghum, posing significant challenges to the rotation process.
This publication provides an up-to-date listing of herbicide rotational restrictions for sorghum planted after failed cotton in Oklahoma. Using information on commonly used herbicides in cotton production and their residual effects on sorghum crops, farmers can make informed decisions to safeguard their crops against potential herbicide damage and maximize yields.
| Herbicide* | Component Herbicides | MOA | Sorghum Plant Back Restrictions | Notes |
|---|---|---|---|---|
| 2,4-D LV6 | 2,4-Dichlorophenoxyacetic Acid | 4 | 7 days | |
| AIM EC | Carfentrazone | 14 | 0 days | |
| Assure II | Quizalofop | 1 | 4 months | |
| Caparol | Prometryn | 5 | Next Season | |
| Clarity | Dicamba | 4 | 15 days | |
| Dual Magnum | S-Metolachlor | 15 | 0 months | Replant only with Concep-treated or screen-treated seed. |
| Fusilade DX | Fluazifop | 1 | 2 months | Do not rotate to grass crops within 2 months (60 days) after application. |
| Fusion | Fluazifop Fenoxaprop | 1 | 2 months | Do not rotate to grass crops within 2 months (60 days) after application. |
| Roundup Power Max | Glyphosate | 9 | 0 months | |
| Gramoxone SL 2.0 | Paraquat | 22 | 0 months | |
| Liberty 280 SL | Glufosinate-Ammonium | 10 | 6 months/180 days | |
| Direx 4L | Diuron | 7 | 4 months | May be planted the following spring after application. |
| Engenia | Dicamba BAPMA Salt | 4 | 14-28 days | Rotation intervals increase with higher application rates. Days listed are based on after receiving 1 inch of rainfall. |
| Enlist Duo with Colex-D Technology | 2,4-D Choline Salt Plus Gly-phosate DMA Salt | 4 & 9 | 7 days | Days listed are based on after receiving 1 inch of rainfall. |
| Enlist One with Colex-D Technology | 2,4-D Choline Salt | 4 | 7 days | Days listed are based on after receiving 1 inch of rainfall. |
| MSMA 6.6 | MSMA | 17 | 0 months | |
| Outlook | Dimethenamid-P | 15 | 0 months | Replant only with Concep-treated or screen-treated seed. |
| Poast Plus | Sethoxydim | 1 | 1 month | |
| Prowl H2O | Pendimethalin | 3 | 10 months | Rotation restrictions can be increased if adequate rainfall is not received. |
| Select 2 EC | Clethodim | 1 | 1 month | |
| Sequence | Metolachlor & Glyphosate | 15 & 9 | 0 months | Replant only with Concep-treated or screen-treated seed. |
| Sharpen | Saflufenacil | 14 | 0 months | |
| Staple LX | Pyrithiobac | 2 | 18 months | Do not rotate to grain sorghum in the season following a Staple LX application. Sorghum can be planted 10 months following if over 25 inches of precipitation and soil mixing has occurred (see label for details). |
| Tavium Plus Vapor-Grip | Dicamba & S-Metolachlor | 4 & 15 | 6 months | |
| Treflan HFP | Trifluralin | 3 | 12 months | |
| Valor SX | Flumioxazin | 14 | 1 month | Days listed are based on after receiving 1 inch of rainfall. |
| Warrant | Acetochlor | 15 | 0 months | |
| XtendiMax with Vapor Grip Technology | Dicamba DGA Salt | 4 | 15 days |
*This list is not all inclusive of herbicides that growers can potentially apply to cotton. Herbicide labels should be consulted for further information or if chemical is not present on the list.