Weed management in alfalfa l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 21

Weed Management in Alfalfa PowerPoint PPT Presentation


  • 354 Views
  • Updated On :
  • Presentation posted in: General

Weed Management in Alfalfa. Fabián Menalled Cropland Weed Specialist 719 Leon Johnson Hall Montana State University [email protected] 406-994-4783. Integrated. Management Practices. Environment. Weed Management in Alfalfa. Integrated Weed Management.

Download Presentation

Weed Management in Alfalfa

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Weed management in alfalfa l.jpg

Weed Management in Alfalfa

Fabián Menalled

Cropland Weed Specialist

719 Leon Johnson Hall

Montana State University

[email protected]

406-994-4783


Slide2 l.jpg

Integrated

Management Practices

Environment

Weed Management in Alfalfa


Integrated weed management l.jpg

Integrated Weed Management

  • Set of cultural, mechanical, and chemical control practices to

    • Limit the introduction and spread of weeds

    • Help the crop compete with weeds

    • Keep weeds "off balance"


Slide4 l.jpg

Integrated

Weed Management in Alfalfa

  • Pre-Crop

  • Alfalfa Establishment

  • Established stand


Pre crop l.jpg

Pre-Crop

  • Start NOW your 2006 weed management plant

  • “Grassy” crop in 2005 (annual summer or winter crop)

    • Good weed control through alternative herbicides

    • Break down the sod

    • “Hay” Barley could be an option to maintain the forage base

  • Control all perennial weeds the season before planting

  • Roundup, 2,4-D, dicamba, Curtail, etc. (observe plant-back restrictions to alfalfa)


Perennial weeds life cycle l.jpg

Perennial Weeds, Life Cycle


Canada thistle management l.jpg

Canada Thistle Management

no. / m2


Perennial weeds management l.jpg

Perennial Weeds Management

PREPLANT

  • Roundup Ultra: many species

  • Eptam: quackgrass, bermudagrass

    POSTEMERGENCE

  • Select: foxtail barley, bermudagrass, quackgrass

  • Buctril: Canada thistle

  • Basagran: Canada thistle

    ESTABLIHED ALFALFA

  • Kerb: foxtail barley, quackgrass,

  • Velpar: foxtail barley, quackgrass,

  • Sencor: foxtail barley, chickweed, dandelion, curly dock


Alfalfa establishment l.jpg

Alfalfa Establishment

Growing Alfalfa for Hay - Montguide 8505

Alfalfa Variety Selection – Montguide 9303

Alfalfa seedlings are poor competitors

Seedbed should be weed free

Used weed-free seeds of the highest quality


Alfalfa establishment10 l.jpg

Alfalfa Establishment

Weed Management Options:

Mechanical: disking, cultivation

Chemical Control

PPI

Post


Weed management handbook l.jpg

Weed Management Handbook

Available: December 2004

On-line

Extension Publications

Montana State University

P.O. Box 172040

Bozeman, MT 59717-2040

406-994-3273


Eptam eptc l.jpg

Eptam (EPTC)

  • PPI

  • 2.25 to 4.5 pt/A

  • annual grasses

    • Foxtails, panicum, bromus, small grains, wild oat

  • broadleaf weeds

    • Chickweed, pigweed, lambsquarter, purslane, carpetweed


Balan df l.jpg

Balan DF

  • PPI

  • 2-2.5 lb/A

  • annual grasses

    • Bluegrass, ryegrass, foxtails, panicums

  • broadleaf weeds

    • Chickweed, pigweed, lambsquarter, purslane,


Slide14 l.jpg

Kochia

Grass2

Lambsq

Pigwd

Treatment1

Rate

------------------ % ------------------

Raptor

Raptor

Raptor

Poast

Pursuit

Buctril

2,4-DB

4 fl oz/A

6 fl oz/A

4 fl oz/A

1.5 pt/A

4 fl oz/A

1.5 pt/A

3 pt/A

89

94

94

87

97

86

91

93

89

88

94

87

91

96

95

95

87

87

88

98

97

97

51

62

Postemergence. Huntley, MT

Weed Control (6/15/01)

1 All Raptor treatments contained COC + 32% UAN

2 Grass = composed of green and yellow foxtail and barnyardgrass


Established alfalfa l.jpg

Established Alfalfa

Is it worth to manage weeds?

Mature alfalfa crowns can compensate for fewer plants by producing more stems or shoots per plant


Is it worth to manage weeds l.jpg

Is it Worth to Manage Weeds?

Select 3 to 4 two-square-foot sections (17” x 17”)

Count the number of stems and divide by two

55 or more stems/ft2 = no change in yield potential with new stand

40-55 stems/ft2 = expect some yield reduction as stand declines

<39 stems/ft2 = significant decline or reduction in yield – best option may be to reestablish


Herbicides labeled for alfalfa l.jpg

Herbicides Labeled for Alfalfa

  • Sinbar – 0.5 to 1.5 lbs/A. Grassy and broadleaf weeds. Do not apply on frozen soil.

  • Treflan - 1.5 to pts / A. Do not apply to seedling alfalfa.

  • Velpar - 1 to 2 qts / A. Rates vary with soil characteristics. Do not graze within 30 days.


Herbicides labeled for alfalfa18 l.jpg

Herbicides Labeled for Alfalfa

  • Velpar – Alfamax

    • Combination of Diuron and Velpar (hexazinone)

    • Dry flowable

    • Contact and residual control

    • One single application during winter

    • Rates = 3.3 – 10 Acres / Unit Pack (14.2 pounds), depending on soil texture and organic matter

    • Mustards, pigweed, chickweed, common lambsquarters

    • Branyardgrass, cheatgrass

    • Dry bulk fertilizer may be coated with Velpar - Alfamax

    • Caution: can damage trees and shrubs


Slide19 l.jpg

Downy Brome Control in Established AlfalfaFowler Creek, Bozeman, MT


Weeds to watch l.jpg

Stevens County Noxious Weed

Weeds to Watch

  • Hoary alyssum (Berteroa incana)

    The Prairie Star, Sept. 2004

Larimer Co., CO


Weeds to watch21 l.jpg

Weeds to Watch

Hoary alyssum

  • Toxic to livestock

  • Up to two feet tall

  • Large number of seeds

  • No Biological Control Options

  • Mechanical Control

    • Hand-pulling of small populations.

    • Mowing will not control it

  • Chemical Control

    • Tordon + 2,4-D amine

    • Redeem

    • Curtail


  • Login