Biology and Management of Biennial Wormwood

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Glyphosate, Weeds, and CropsControlWhere possible, preemergence followed by postemergence herbicides isthe most effective strategy in biennial wormwood control (Kegode 2000,Fronning and Kegode 2004b).PreemergenceBecause of season-long emergence of biennial wormwood, soil-appliedherbicides with long residual are needed to provide the best management(Fronning and Kegode 2004a). Active ingredients of soil-applied herbicidesthat provide greater than 80 percent control of biennial wormwoodinclude flumioxazin (Valor®), isoxaflutole (Balance Pro®), metribuzin andsulfentrazone (Spartan®). Biennial wormwood is tolerant of most ALSherbicide with the exception of flumetsulam (Python®). Flumetsulamapplied pre-emergence will control biennial wormwood.PostemergencePostemergence herbicides must be applied to seedlings that are less than3 inches (8 centimeters) in height (Fronning and Kegode 2004b). Biennialwormwood becomes very tolerant to postemergence herbicides when plantsare greater than 3 inches tall. Active ingredients of postemergence herbicidesthat provide greater than 80 percent control of biennial wormwood includeatrazine, bentazon, clopyralid, dicamba, glufosinate, glyphosate, MCPA and2,4-D.8RateHerbicide (product/A) Wheat Corn Soybeanatrazine 0.38-0.5 lb ai CBalance Pro® 1.5-3 fl. oz. CBasagran® 1 pt. fb 1 pt. S/C S/CBronate® 2 pt. S/CCurtail®/Curtail M® 2-2.67 pt. Cdicamba 2-4 fl. oz. S S/CExtreme® (RR) 2.25 pt. S/Cglyphosate 0.75 lb. ai S/C S/C S/CHornet® 2-5 oz. CLiberty® (Liberty Link) 28-34 fl. oz. C CMCPA 1 pt. S/CPython® 0.8-1.33 oz. C CSencor® (PRE) 0.25-0.33 lb. CSpartan® 3-8 fl. oz. S/CStatus® 4-5 oz. S/CStinger® 0.25-0.66 pt. CValor® 2-3 oz. S/CWideMatch® 1-1.33 pt. C2,4-D 0.5-1 pt. S/CS = suppression, C = control
Biology and Management of Biennial WormwoodBiennial Wormwood Control inOther CropsDrybean and LentilApply Basagran® at 1 pint per acre (pt/A) before biennial wormwoodseedlings are 2 to 3 inches tall, followed by another application of Basagran®at 1 pt/A no more than 14 days later. This sequential application results inexcellent control of biennial wormwood. (Figure 10).Dry pea and ChickpeaApply Spartan® preemergence followed by post-applied Basagran®. Asequential postemergence Basagran® application can be used as described inthe Drybean and Lentil section.Sunflower – Conventional and ClearfieldPreemergence Spartan® may control or reduce biennial wormwoodinfestations.FlaxApply Spartan® preemergence followed by post-applied MCPA or Bronate®.Canola and SugarbeetApply Stinger® postemergence.PotatoPreemergence Valor®/Chateau® can control or reduce biennial wormwoodinfestations.Roundup Ready Alfalfa, Canola, Corn and SoybeanGlyphosate can control emerged biennial wormwood plants. Use of othereffective residual herbicides may be needed for season-long control. See cropsections above. Glyphosate split-applied also provides excellent control ofbiennial wormwood.Late Postemergence Control of Biennial WormwoodBiennial wormwood can go undetected in crop fields until the seedlingsare too large to be controlled effectively. Evaluation of Basagran®, Liberty®and glyphosate in greenhouse studies for efficacy of control of various sizesUntreatedBasagran at 1 pt /A (0.5 lb ai /A)Figure 10. Control ofbiennial wormwoodwith Basagran®applied once and twice(split-application).Basagran at 2 pt /A (1 lb ai /A) Basagran split-applied at 1 pt /Afollowed by 1 pt /A (0.5 / 0.5 lb ai /A)9
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Biology and Management of Biennial Wormwood

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