Biology and Management of Biennial Wormwood
Biology and Management of Biennial Wormwood
Biology and Management of Biennial Wormwood
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Glyphosate, Weeds, <strong>and</strong> CropsControlWhere possible, preemergence followed by postemergence herbicides isthe most effective strategy in biennial wormwood control (Kegode 2000,Fronning <strong>and</strong> Kegode 2004b).PreemergenceBecause <strong>of</strong> season-long emergence <strong>of</strong> biennial wormwood, soil-appliedherbicides with long residual are needed to provide the best management(Fronning <strong>and</strong> Kegode 2004a). Active ingredients <strong>of</strong> soil-applied herbicidesthat provide greater than 80 percent control <strong>of</strong> biennial wormwoodinclude flumioxazin (Valor®), isoxaflutole (Balance Pro®), metribuzin <strong>and</strong>sulfentrazone (Spartan®). <strong>Biennial</strong> wormwood is tolerant <strong>of</strong> most ALSherbicide with the exception <strong>of</strong> 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 <strong>and</strong> Kegode 2004b). <strong>Biennial</strong>wormwood becomes very tolerant to postemergence herbicides when plantsare greater than 3 inches tall. Active ingredients <strong>of</strong> postemergence herbicidesthat provide greater than 80 percent control <strong>of</strong> biennial wormwood includeatrazine, bentazon, clopyralid, dicamba, glufosinate, glyphosate, MCPA <strong>and</strong>2,4-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