Scotch Thistle/Control Measures- LCCD has compiled a Chemical Handbook to assist producers with noxious weed treatments. 
Control Measures for Scotch Thistle
Alias:  Onopordum acanthium
 
Mechanical Control:
  • Small infestations may be controlled by cutting the root below the soil surface.  This will kill the plant.
 
Cultural Control:
  • Re-establish desirable vegetation to provide competition.
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    Chemical Control:
  • Tordon
        Rate:        0.25 lb. acid equivalent per acre.
        Time:       Apply rosettes in spring or fall.
    •     Remarks: Follow-up treatment will be necessary to control new seedlings.  Use of Surfactant will increase effectiveness.
        Caution:   Restricted use pesticide.  Must be applied by or supervised by a Certified Applicator. Follow label recommendations                     and precautions.  Do not contaminate water.
     
  • 2,4-D
        Rate:          1.5 to 2 lbs. acid equivalent per acre.
        Time:         Apply to rosettes in spring or fall.
        Remarks:   Annual treatments are needed to control seedlings.
        Caution:    Avoid drift to sensitive plants.  Follow label recommendations and precautions.  Do not contaminate water.
    		•
     
    Rates for 3-4 Gallon Back Pack Sprayer/Tordon or 2, 4-D:
    • Add 6-8 ounces of herbicide to 3-4 gallons of water in the sprayer.  *Add a couple ounces of Surfactant and stir.  *NOTE:  Be sure always to follow label rates as percent of active ingredients may vary.

    Cooperatively prepared by the Lander County Conservation District and the Nevada Department of Agriculture.

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