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alfalfa is an effective competitor only after it is established (i.e., it will not establish in a well-
<br />developed Canada thistle community).
<br />Table 2. Herbicide options for controlling Canada thistle.
<br />All label directions and precautions must be followed.
<br />Do not use herbicides that will damage desirable snecies_ "aP" stands for "acid PnuivalPnt "
<br />Herbicide Rate Notes Reference
<br />Picloram, May be applied on non-crop areas only. Apply when-
<br />e.g., Tordon 1 qt/acre ever C. thistle is actively growing, but fall applica- 1,2
<br />2210' tions articular) effective.
<br />
<br />Picloram + . 1 qt piclo-
<br />ram/acre 2,4-D may be used on pastures, rangeland, and non-
<br />
<br />2,4-D
<br />. 1 qt or 1.5-2.0 ae crop areas. Apply whenever C. thistle is actively 1,2
<br />
<br />2,4-D/acre growing, but fall applications particularly effective.
<br />Escort + 2,4- 2,4-D @ 1.5-2.0 2,4-D may be used on pastures, rangeland, and non-
<br />D ae/acre crop areas. 2,4-D should be applied in pre-bud to 1,2
<br /> earl bud stage -10-15" tall).
<br />Clopyralid,
<br />Stinger, /3-1 pt /acre in
<br />spring May be used on non-crop areas only. Most effective
<br />2
<br />Transline
<br />ra
<br />.
<br />1 t / acre in fall when applied to rosette to bud growth stages.
<br /> -Apply before bud stage. Use higher rate for dense
<br /> infestations or under poor growing conditions, e.g.,
<br />Clopyralid + drought. May be used on non-crop areas only.
<br />2
<br />4-D
<br />e.g . 1.2-1.8 lb ae (or
<br />2 -Performance may be improved when preceded by 2- 1
<br />2
<br />,
<br />,
<br />,
<br />Curtail 2-3 qts
<br />) per acre 3 mowings. Begin mowing when C. thistle is 12-15" ,
<br /> tall, repeat @ 1-mo. intervals. Apply clopyralid (2-3
<br /> qts/acre) -1 mo. after 3rd mowing. Follow regimen for
<br /> 2 consecutive yrs.
<br /> Dicamba can be applied at any time during the grow-
<br /> ing season to actively growing plants; however, appli-
<br />Dicamba, 2 qts/acre when C. cations in the late vegetative to bud stage or in the
<br />e.g., Banvel, thistle is in rosette fall may be most effective if the plant has 8-12" re-
<br />
<br />Vanquish,
<br />stage (early
<br />growth. May be used on pastures, rangeland, and 1,2
<br />Clarity spring) non-crop areas. May be most effective when com-
<br /> bined with 2,4-D as a split-season application (see
<br /> below).
<br />2,4-D + di- Split-season treatment: Apply 2,4-D in pre-bud to
<br />camba 2 qts/acre (both) early bud stage when C. thistle is -10-15" tall. Apply 2
<br /> dicamba to regrowth in fall.
<br /> Dicamba can be applied at any time during the grow-
<br /> ing season to actively growing plants; however, appli-
<br />Dicamba +
<br />2
<br />4-
<br />applied @ cations in the late vegetative to bud stage or in the
<br />2,4-D, e.g., ,
<br />1
<br />5-2
<br />0
<br />ae/acre fall may be most effective if the plant has 8-12" re- 1,2
<br />Veteran 720 .
<br />.
<br />. growth. 2,4-D may be used on pastures, rangeland,
<br /> and non-crop areas. 2,4-D should be applied in pre-
<br /> bud to earl bud stage -10-15" tall).
<br />Iuu.iiwww.w.ianmer co usipupncworKSrweeasimanaaemenvm4tcanaaa i rnsye ntm
<br />Beck 2000
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