| Table 3. Herbicides for Established Alfalfa Stands Any person using products listen in this handout assumes full responsibility for their use in accordance with current directions of the manufacturer. |
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| Trade Name, Formulation, & Application Rate | Other Trade Names | Active Ingredient(s) | Application Timing | Other Labeled Forages | Special Instructions and Remarks |
| Butyrac 200 2 lb/gal S 1 to 3 qt/A |
Butoxone 175 Butoxone 200 Butoxone 7500 |
2,4-DB | Growing | None | Do not harvest or graze for 30 days after treatment. Do not use on sweet clover. Use when weeds less than 3 inches tall (3 inches across for rosettes). Use higher rates for seedling smartweed or curly dock. |
| Gramoxone Max 3 lb/gal S 0.75 to 1.3 pt/A for dormant stands 0.75 pt/A for between cutting applications |
None | paraquat | Dormant stands less than 1 year old or Between Cuttings | None | For dormant-season applications, do not apply if regrowth following the last fall cutting is more than 6 inches tall in the fall or more than 2 inches tall in the spring. Do not apply more than 1 dormant-season application in a season. Do not graze or harvest within 42 days after a dormant-season application and for 30 days after between cutting applications. Do not apply more than 3 between-cutting applications per season. Between-cutting treatments should be applied within 5 days after cutting. Weeds should be succulent and growing at the time of application. Restricted Use Pesticide. |
| Kerb 50 W 50% WP 1 to 3 lb/A |
None | pronamide | Growing or Dormant | birdsfoot trefoil, crownvetch & clovers | Do not graze or harvest for 120 days after application. Apply in the fall after last cutting, when weather and soil temperatures are cool. Restricted Use Pesticide. |
| Poast 1.5 lb/gal EC 0.75 to 2.5 pt/A |
Poast Plus | sethoxydim | Postemergence | birdsfoot trefoil | Do not apply within 7 days of grazing, feeding, or harvesting undried forage, or within 14 days of harvesting dry hay. Do not apply more than 6.5 pts/acre/season. Best grass control is achieved when application is made prior to mowing. If tank-mixed with 2,4-DB, follow the 2,4-DB harvest and grazing restrictions. |
| Pursuit 2AS 2 lb/gal AS 3-6 fl. oz./A |
Pursuit 70 DG | imazethapyr | Postemergence | None | Do not feed, graze or harvest for 30 days after application. May temporarily reduce alfalfa height. Apply to alfalfa in 2nd or larger trifoliate leaf stage and to weeds 1 to 3 inches tall (3 inches across for rosettes). Add nonionic surfactant or COC plus 28% N. |
| Roundup Ultra 4 lb/gal SL 2% solution for spot treatments 1 qt/A for preharvest applications |
Credit |
glyphosate | Growing | For Spot Treatments. For Preharvest Treatments. |
For Spot Treatments. Do not treat more than 1/10 of any acre at one time, other applications may be made in the same area at 30 day intervals. Do not graze or harvest for 14 days. Do not contact desirable, non-target vegetation because damage may occur. Apply to actively growing, susceptible weeds. Refer to label for recommended timing of application for maximum effectiveness on target species. For Preharvest Treatments. Do not apply to alfalfa grown for seed. Do not harvest within 36 hours after application. Treated alfalfa and weeds can be harvested and fed to livestock, including lactating animals. May be used in declining alfalfa stands or any stand of alfalfa where crop destruction is acceptable. Controls various annual and perennial weeds. |
| Select 2 EC 2 lb/gal EC 8 to 16 fl. oz./A |
Prism | clethodim | Postemergence | birdsfoot trefoil | Do not apply within 15 days of grazing, feeding or harvesting forage. Do not plant rotational crops within 30 days after application. Do not apply a broadleaf herbicide within 1 day following Select application. If tank-mixed with 2,4-DB, follow the 2,4-DB harvest and grazing restrictions. Always use COC. |
| Sencor 4 4 lb/gal L 0.5-2 pt/A |
Lexone DF Sencor DF |
metribuzin | Dormant | alfalfa-grass mixes | Do not use on soils with a pH greater than 7.5. Do not graze or harvest for 28 days after treatment. Apply once in the fall or spring before new growth. Rate is based on soil type and organic-matter. Higher rates may injure grass component. Sencor may be applied as a post-dormant application impregnated on dry fertilizer. |
| Sinbar 80% WP 0.5 to 1.5 lb/A |
None | terbacil | Dormant | None | Do not plant any crop for 2 years. Apply once in the fall or spring before new growth starts. Use lower rates for coarser soils. |
| Velpar L 2 lb/gal L 1-3 qt/A |
Velpar SP | hexazinone | Dormant | None | Do not plant any crop except corn within 2 years of treatment. Do not graze or harvest for 30 days. Apply in the fall or spring before new growth exceeds 2 inches in height. May be impregnated on dry fertilizer and applied as a dormant treatment. Can also be applied to stubble after hay removal but before regrowth exceeds 2 inches. Corn may be planted 12 months after treatment, provided deep tillage is used. |