a good competitive crop is your best herbicide –soil sample and apply only what is needed –deep...

• 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

http://lincoln-adams.wsu.eduagriculture

Fertilizer Influence on Grass Weeds

Dan BallOregon State University

Pendleton, OR


N and Maverick® effects on no-till winter wheat & downy brome

Unsprayed Sprayed

N Rate Wheat

Downy Brome

Wheat

Downy Brome

lb/A bu/A lb/A bu/A lb/A

0 30 500 39 0

40 43 800 52 200

80 18 2800 61 200

120 22 3300 92 100

160 7 5800 80 500

Ball et al.


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


Average Downy Brome Control in Winter Wheat

Treatment TimingNumber of trials

Average% Control Low High

Beyond Fall 5 87 73 99

Maverick Fall 17 86 76 99

Olympus Fall 14 76 43 97

Maverick + Sencor Fall 8 89 74 100

Olympus + Sencor Fall 9 89 80 100

Beyond Spring 6 85 69 97

Maverick Spring 18 66 18 92

Olympus Spring 15 70 18 92

Maverick + Sencor Spring 10 81 29 93

Olympus + Sencor Spring 12 84 44 96


Yenish, et al.

Average Downy Brome Control in Winter Wheat

Treatment TimingNumber of trials

Average% Control Low High

Olympus Flex Spring 3 86 84 92

Osprey Spring 2 65 39 91

pyroxsulam Spring 1 87 - -


Yenish, et al.


Trade Name Herbicide Group, Site of Action

Maverick 2 Acetolactate synthase (ALS) inhibitors

Olympus 2 Acetolactate synthase (ALS) inhibitors

Olympus Flex 2 Acetolactate synthase (ALS) inhibitors

Osprey 2 Acetolactate synthase (ALS) inhibitors

Beyond 2 Acetolactate synthase (ALS) inhibitors

Fargo 8 Lipid synthesis inhibitors

Sencor 5 Photosystem II inhibitors

Lexone 5 Photosystem II inhibitors

Assure II 1 Acetyl CoA carboxylase (ACCase) inhibitors

Roundup 9 EPSP synthase inhibitorsSource: PNW 437, Herbicide-Resistant Weeds and Their Management

Herbicide-Resistant Weed Mgt


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


0

10

20

30

40

50

60

70

80

90

100

PowerFlex 2.75 oz

PowerFlex 3.5 oz

COC 2,4-D Ester

Ally Maverick

OlympusOsprey

Osprey + COC

Finesse

Control of Brome with PowerFlex

Applied April 5, 2007 Steve Wellsandt, Ritzville


• Plant back restrictions prevention crop rotation




Trade Name Wheat Barley Pea Canola ------------------------------------------ Months

------------------------------------------

Maverick 0 22-bioassay 17-22 22-bioassay

Olympus 0 18 (24” prec.) 12 (24” prec.) 22 (24” prec.)

Olympus Flex 0 12 (18” prec.) 12 (18” prec.) 22 (24” prec.)

Osprey 0.25 1 3 10

Beyond 3 9-18 0 26

Fargo 0 0 0 0

Sencor 4 4 8 12

Lexone 4 4 8 12

Assure II 4 4 0 0

Roundup 0 0 0 0Source: PNW 571, Plantback restrictions for herbicides used in the dryland wheat production areas of the Pacific Northwest.

Plant Back Restriction


PowerFlex

Rotational Crops Rotational Interval Months

Wheat, triticale 0

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


a good competitive crop is your best herbicide –soil sample and apply only what is needed –deep...

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