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Weed Management in Alfalfa. Fabián Menalled Cropland Weed Specialist 719 Leon Johnson Hall Montana State University menalled@montana.edu 406-994-4783. Integrated. Management Practices. Environment. Weed Management in Alfalfa. Integrated Weed Management.

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weed management in alfalfa

Weed Management in Alfalfa

Fabián Menalled

Cropland Weed Specialist

719 Leon Johnson Hall

Montana State University

menalled@montana.edu

406-994-4783

slide2

Integrated

Management Practices

Environment

Weed Management in Alfalfa

integrated weed management
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

Integrated

Weed Management in Alfalfa

  • Pre-Crop
  • Alfalfa Establishment
  • Established stand
pre crop
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 management
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
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
Alfalfa Establishment

Weed Management Options:

Mechanical: disking, cultivation

Chemical Control

PPI

Post

weed management handbook
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
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
Balan DF
  • PPI
  • 2-2.5 lb/A
  • annual grasses
    • Bluegrass, ryegrass, foxtails, panicums
  • broadleaf weeds
    • Chickweed, pigweed, lambsquarter, purslane,
slide14

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
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
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
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
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
weeds to watch

Stevens County Noxious Weed

Weeds to Watch
  • Hoary alyssum (Berteroa incana)

The Prairie Star, Sept. 2004

Larimer Co., CO

weeds to watch21
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