ISSUE 2    May 11, 2006

FAIRY CANDELABRA /YELLOW WHITLOWWORT - NUISANCE WEEDS

Fairy Candelabra questions and specimens are coming in for ID. This little plant is amazing. After people find out its name they want to know how to kill it. It doesn't matter because it will be dead in a week or so anyway. We (the weeds group) actually think it would be a good cover crop. It emerges quickly, is small in stature, has a shallow root system, doesn't use much soil moisture, dies before much time goes by in the spring, and doesn't interfere with crop growth.

Glyphosate or any herbicide will not control it, because has already bolted, has flowered, and now setting seed. As we know from field pennycress, shepherdspurse, and wild mustard, once winter annuals bolt they become very difficult to kill. This makes sense since they are nearing the end of their life cycle.

Fairy Candelabra
Fairy Candelabra

 

WEED ID AND WEED CONTROL WEB SITES

The following web sites are excellent sources of weed ID, weed control, and herbicide information.

1. NDSU Weed Science Web Site:

http://www.ag.ndsu.edu/weeds

Web address is on the cover of the 2006 Weed Control Guide.

  • 2006 Weed Control Guide
  • 2006 NC Vegetable Weed Control Guide
  • 2006 Herbicide Price List
  • 1978/79 and 2000 ND Weed Surveys
  • ND Pesticide Use Surveys
  • Extension Weed/Herbicide Extension Publications
  • NDSU Extension Crop Production Publications
  • 2006 Section 18 status
  • CDMS Pesticide Label Search
  • Herbicide Resistant Weed Web Site
  • Weed Identification
  • Previous Crop and Pest Reports
  • Other academic and UDSA weed information
  • 2. NDSU Invasive Weed Science Web Site:

    http://www.ag.ndsu.nodak.edu/invasiveweeds

  • Publications, database and other information concerning identification and control of ND noxious and invasive weeds.
  • 3. NDSU Pesticide Training and Certification Program

    http://www.ag.ndsu.nodak.edu/aginfo/pesticid/pesticid.htm

  • All EPA approved ND herbicide Section 18, 24c, and 2(ee) registrations have been posted on the web.
  • 5. NDSU Plant Diagnostic Lab:

    http://www.ag.ndsu.nodak.edu/diaglab/

    6. Pesticide Labels

    http://www.cdms.net/manuf/manuf.asp

  • A free web site with all current pesticide and adjuvant labels. Also contains state, 2ee, and supplemental labels.
  • http://www.greenbook.net/

    http://www.kellysolutions.com/nd/

    Richard Zollinger
    NDSU Extension Weed Specialist
    r.zollinger@ndsu.edu

     

    COMPARISON TO POST GRASS HERBICIDES IN WHEAT

    In years past, when we had only 3 or 4 major postemergence grass herbicides that were labeled in wheat we could remember the specifics about them. Puma controlled green foxtail very well but required higher rates for yellow foxtail and wild oat. Discover controls foxtail and wild oat, but cannot be used on barley. Everest controls foxtail, wild oat, and mustards and can give residual grass control with adequate soil activiation from precipitation.

    Now we have a few more POST herbicides, like Beyond in Clearfield wheat. In addition, we have some different grasses infesting parts of North Dakota: Persian darnel, downy borme, Japanese brome, and foxtail barley. A comparison guide, developed by Greg Endres, NDSU Area Extension Agronomist, is shown below as a quick reference.

    NDSU Small Grain Grass Herbicide Quick Reference Guide (May, 2006)

    Axial

    Discover

    Everest

    Puma

    Rimfire

    Crop

    Winter and HRS wheat, barley

    HRS and durum wheat

    HRS and durum wheat

    Wheat and barley

    Wheat

    Crop stage

    2-leaf to boot

    2-leaf until prior to boot

    emergence to prior to jointing

    Wheat: emergence to 60 days before harvest. Barley:1-4 leaf

    1-leaf to flag leaf emergence

    Grass weed stage

    1-6 leaf + 3 tillers

    1-5 leaf foxtail and 1-6 leaf wild oat

    up to 4 leaves

    1 leaf to 2 tiller

    1 leaf to 2 tiller

    Mode of Action

    ACCase Inhibitor

    ACCase Inhibitor

    ALS inhibitor

    ACCase Inhibitor

    ALS inhibitor

    Application rate/A

    8.2 fl oz

    3.2 and 4 fl oz; NG 12.8 and 16 fl oz

    0.3-0.6 oz

    0.33-0.66 pt

    1.75-2.25 oz

    Cost ($/A)

    12.50

    12.50-15.50

    9.50-14.50

    7.50-15

    8.25-10.50

    Adjuvant

    Adigor 9.6 fl oz/A (co-pack)

    DSV (co-pack); MSO 0.25% may be added

    NIS 0.25% or basic pH blend 1% if no EC or ester broadleaf herbicides

    mefenpyr safener (prepackaged)

    MSO 1.5 pt/A, or NIS 0.5% + UAN 1-2 qt/A, or basic pH blend 1%

    Residual for weed control

    No

    No

    Yes

    No

    Yes

    GPA ground

    5 - 10

    5

    5 - 10

    5-10

    10-15

    GPA Air

    5

    3

    3 - 5

    5

    5

    Rainfast (hours)

    0.5

    0.5

    1

    1

    4

    PHI (days)

    60

    60

    60

    wheat - 60, barley - 57

    71

    Crop rotation restrictions beyond next crop season (months after app)

    No

    No

    field pea - 11; oat - 18; chickpea and lentil - 24

    No

    corn, crambe, CRP grass, potato and sugarbeet - 12

    Grass weed control:

    Wild Oat

    Control

    Control1

    Control2

    Control1

    Control2

    Green foxtail

    Control

    Control1

    Control

    Control1

    Suppression

    Yellow foxtail

    Control

    Control1

    Suppression

    Control1

    Suppression

    Barnyardgrass

    Suppression

    Control

    Suppression

    Control

    Control

    Downy Brome

    None

    None

    Suppression

    None

    Suppression

    Japanese Brome

    None

    None

    Control

    None

    Suppression

    Persian Darnel

    Control

    Control

    Suppression

    None

    Suppression

    Foxtail Barley

    None

    None

    None

    None

    Suppression

    Quackgrass

    None

    None

    Suppression

    None

    Suppression

    Selected annual broadleaf weed control

    No

    No

    Yes

    No

    Yes

    Tank mixtures

    see labels

    1Except ACCase resistant plants.
    2Except ALS resistant plants.


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