Shark/Aim (carfentrazone, Group 14) – This post-emergence herbicide can be applied when alfalfa is dormant or between cuttings. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. Herbicide registrations increased through the 1980s. In established alfalfa stands AIM and Chateau Herbicide SW are other options that could be used for post-emergent control only in established stands. However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. Preharvest Weed Control in Declining Alfalfa Stands Quackgrass, Volunteer Cereals, and Annual Grasses in New or Established Stands Aim herbicide may be applied to wheat from prior to planting up to leaf stem elongation (jointing). (8 pt/a safe on alfalfa in several 2008 trials – marestail, prickly lettuce, blue mustard, wild oat, and downy brome control) • Aim – 1 or 2 oz/A totally desiccated emerged alfalfa, normal In most cases, 2-inches of alfalfa regrowth is the maximum height listed. Alfalfa (Medicago sativa L.) is popularly known as the Queen of Forages because of its high forage nutritive value characteristics.Alfalfa is a high-yielding, perennial legume that is well-suited for hay, silage, baleage, and grazing management systems. Herbicide registration for weeds in alfalfa began following World War II with the first registered selective herbicide 2,4-DB. Autumn™ Super 51 18 Axiom ® 12 Basis ® Blend 10-18. Acuron ® 18 Agent ® 1.88 18 Aim ® EC 12 Alluvex™ 18 Anthem™ ATZ 18 Atrazine 2 cropping seasons Authority ® Brands 12-18. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. According to Earl Creech an Extension agronomist at Utah State University there’s three new herbicides to consider using this winter. Spraying beyond this stage may cause stand and/or yield reductions. Only Metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. It is best used at rates from 0.5 to 1.0 oz/ac with 2,4-D. Perennial Weed Control-Quackgrass, Field Bindweed, Canada Thistle, Johnsongrass, etc. Aim will cause leaf spotting on emerged leaves, but plants quickly outgrow the injury. INTRODUCTION Weed control is important in alfalfa seed production in order to produce high quality seed and maximize yields. Herbicides in alfalfa. Summary: 2007 Herbicide Trial in Alfalfa Seed • Asulox – good alfalfa tolerance with 3 or 6 pt/A, ~80% control of mayweed. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. It can be applied at rates from 0.5 to 2.0 oz/ac. Carfentrazone (Aim) has promise as a ‘set back’ herbicide for alfalfa seed production. Many newer products on the market contain older active ingredients that work fine in low desert alfalfa … AIM can be used in-between cuttings up to 3” of growth, with a pre-harvest interval of 21 days. Spraying beyond this stage may cause stand and/or yield reductions. Winter is the worst time for weeds in alfalfa and understandably so. The material and content contained in the Greenbook label database is for general use information only. Agworld and Greenbook do not provide any guarantee or assurance that the information obtained through this service is accurate, current or correct, and are therefore not liable for any loss resulting, directly or indirectly, from reliance upon this service. Herbicide Restrictions for Planting Alfalfa. Winter is when alfalfa plants go nearly dormant in most of the country, growing extremely slow unable to provide enough competition for weeds. Seed yield unaffected. 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