A good competitive crop is your best herbicide –Soil sample and apply only what is needed –Deep band fertilizer early in fallow period rather than near planting –Do not spring top dress N fertilization Little benefit for winter wheat and increases downy brome seed production and water use –Adequate P levels Deep band or starter placement FERTILIZER: Management Strategies for a Downy Brome Infestation agriculture

Fertilizer Influence on Grass Weeds Dan Ball Oregon State University Pendleton, OR agriculture

N and Maverick® effects on no-till winter wheat & downy brome Ball et al. agriculture

HERBICIDES: Management Strategies for a Downy Brome Infestation A good competitive crop improves herbicide efficacy Fall vs. Spring Weather …moisture & temp Site of Action …Herbicide resistance mgt Plant back restrictions agriculture

Average Downy Brome Control in Winter Wheat TreatmentTiming Number of trials Average % ControlLowHigh BeyondFall MaverickFall OlympusFall Maverick + SencorFall Olympus + SencorFall BeyondSpring MaverickSpring OlympusSpring Maverick + SencorSpring Olympus + SencorSpring agriculture Yenish, et al.

Average Downy Brome Control in Winter Wheat TreatmentTiming Number of trials Average % ControlLowHigh Olympus FlexSpring OspreySpring pyroxsulamSpring agriculture Yenish, et al.

HERBICIDES: Management Strategies for a Downy Brome Infestation Trade NameHerbicide Group, Site of Action Maverick2 Acetolactate synthase (ALS) inhibitors Olympus2 Acetolactate synthase (ALS) inhibitors Olympus Flex2 Acetolactate synthase (ALS) inhibitors Osprey2 Acetolactate synthase (ALS) inhibitors Beyond2 Acetolactate synthase (ALS) inhibitors Fargo8 Lipid synthesis inhibitors Sencor5 Photosystem II inhibitors Lexone5 Photosystem II inhibitors Assure II1 Acetyl CoA carboxylase (ACCase) inhibitors Roundup9 EPSP synthase inhibitors Source: PNW 437, Herbicide-Resistant Weeds and Their Management Herbicide-Resistant Weed Mgt agriculture

PowerFlex Dow AgroSciences Anticipated Registration by Summer Pyroxsulam –Group 2; HRAC B Grass and some broadleaf weed control in wheat Wheat in rotation with canola, corn, fallow, flax, sorghum, grasses, or mustard agriculture

PowerFlex 2.75 oz PowerFlex 3.5 oz COC 2,4-D Ester Ally Maverick Olympus Osprey Osprey + COC Finesse Control of Brome with PowerFlex Applied April 5, 2007 Steve Wellsandt, Ritzville agriculture

Plant back restrictions prevention crop rotation HERBICIDES: Management Strategies for a Downy Brome Infestation agriculture

HERBICIDES: Management Strategies for a Downy Brome Infestation Trade NameWheatBarleyPeaCanola Months Maverick 022-bioassay bioassay Olympus 018 (24” prec.) 12 (24” prec.) 22 (24” prec.) Olympus Flex 012 (18” prec.) 22 (24” prec.) Osprey Beyond Fargo 0000 Sencor Lexone Assure II 4400 Roundup 0000 Source: PNW 571, Plantback restrictions for herbicides used in the dryland wheat production areas of the Pacific Northwest. Plant Back Restriction agriculture

PowerFlex Rotational CropsRotational Interval Months Wheat, triticale0 Alfalfa, barley, canola, chickpeas, dry bean, flax, field corn, field pea, lentil, millet, mustard, oats, potato, safflower, grain sorghum, millet, oats, sugar beet, and sunflower. 9 All other crops (bioassay recommended)12 agriculture