Spraying beyond this stage may cause stand and/or yield reductions. According to Earl Creech an Extension agronomist at Utah State University there’s three new herbicides to consider using this winter. Carfentrazone (Aim) has promise as a ‘set back’ herbicide for alfalfa seed production. In established alfalfa stands AIM and Chateau Herbicide SW are other options that could be used for post-emergent control only in established stands. Aim will cause leaf spotting on emerged leaves, but plants quickly outgrow the injury. It can be applied at rates from 0.5 to 2.0 oz/ac. asulam (Asulox) in forage and seed production trials in 2007 and 2008. Only Metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. In most cases, 2 inches of alfalfa regrowth is the maximum height listed. However, only metribuzin, Pursuit, Prowl H2O, and Aim can be applied to established alfalfa-grass mixes. Pesticide Alfalfa Rotation Interval (Months) AAtrex ® 4L or Nine-O 2 cropping seasons Accent ® Q 10-12. Autumn™ Super 51 18 Axiom ® 12 Basis ® Blend 10-18. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. Spraying beyond this stage may cause stand and/or yield reductions. 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. (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 Perennial Weed Control-Quackgrass, Field Bindweed, Canada Thistle, Johnsongrass, etc. The material and content contained in the Greenbook label database is for general use information only. Herbicide registrations increased through the 1980s. Shark/Aim (carfentrazone, Group 14) – This post-emergence herbicide can be applied when alfalfa is dormant or between cuttings. Herbicide Restrictions for Planting Alfalfa. 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. Keep in mind all of these herbicides are labeled for use in pure-stand alfalfa. In most cases, 2-inches of alfalfa regrowth is the maximum height listed. Acuron ® 18 Agent ® 1.88 18 Aim ® EC 12 Alluvex™ 18 Anthem™ ATZ 18 Atrazine 2 cropping seasons Authority ® Brands 12-18. Herbicides in alfalfa. Herbicide registration for weeds in alfalfa began following World War II with the first registered selective herbicide 2,4-DB. 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. It is best used at rates from 0.5 to 1.0 oz/ac with 2,4-D. Seed yield unaffected. Preharvest Weed Control in Declining Alfalfa Stands Quackgrass, Volunteer Cereals, and Annual Grasses in New or Established Stands Summary: 2007 Herbicide Trial in Alfalfa Seed • Asulox – good alfalfa tolerance with 3 or 6 pt/A, ~80% control of mayweed. Aim herbicide may be applied to wheat from prior to planting up to leaf stem elongation (jointing). 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