The material and content contained in the Greenbook label database is for general use information only. INTRODUCTION Weed control is important in alfalfa seed production in order to produce high quality seed and maximize yields. 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 Pesticide Alfalfa Rotation Interval (Months) AAtrex ® 4L or Nine-O 2 cropping seasons Accent ® Q 10-12. Herbicides in alfalfa. Seed yield unaffected. Perennial Weed Control-Quackgrass, Field Bindweed, Canada Thistle, Johnsongrass, etc. Many newer products on the market contain older active ingredients that work fine in low desert alfalfa … In most cases, 2 inches of alfalfa regrowth is the maximum height listed. Shark/Aim (carfentrazone, Group 14) – This post-emergence herbicide can be applied when alfalfa is dormant or between cuttings. AIM can be used in-between cuttings up to 3” of growth, with a pre-harvest interval of 21 days. Summary: 2007 Herbicide Trial in Alfalfa Seed • Asulox – good alfalfa tolerance with 3 or 6 pt/A, ~80% control of mayweed. However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. According to Earl Creech an Extension agronomist at Utah State University there’s three new herbicides to consider using this winter. Aim will cause leaf spotting on emerged leaves, but plants quickly outgrow the injury. asulam (Asulox) in forage and seed production trials in 2007 and 2008. Spraying beyond this stage may cause stand and/or yield reductions. In established alfalfa stands AIM and Chateau Herbicide SW are other options that could be used for post-emergent control only in established stands. Herbicide registration for weeds in alfalfa began following World War II with the first registered selective herbicide 2,4-DB. Herbicide Restrictions for Planting Alfalfa. (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 Spraying beyond this stage may cause stand and/or yield reductions. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. 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. Only Metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. Aim herbicide may be applied to wheat from prior to planting up to leaf stem elongation (jointing). Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. Herbicide registrations increased through the 1980s. In most cases, 2-inches of alfalfa regrowth is the maximum height listed. Carfentrazone (Aim) has promise as a ‘set back’ herbicide for alfalfa seed production. 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. Spraying beyond this stage may cause stand and/or yield reductions. Autumn™ Super 51 18 Axiom ® 12 Basis ® Blend 10-18. It is best used at rates from 0.5 to 1.0 oz/ac with 2,4-D. It can be applied at rates from 0.5 to 2.0 oz/ac. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. Winter is the worst time for weeds in alfalfa and understandably so. 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