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2/26113 Canada this tle -lnvasiw species : Minnesota DNR <br />Control Methods: <br />Mechan ical <br />Repeated pulling and mowing will weaken roots, mowing when flower buds are just <br />to open <br />Late spring burns May/June are most detrimental, but also stimulate seed <br />germination ; burn consecutively for 3 years <br />C h emical <br />Spot app li cation with glyphosate or with selective herbicide clopyralid, or <br />mets u lfu ro n <br />Biological <br />Stem weevil , bud weevil and stem gall fly are commercially available <br />Native Substitutes: <br />• B lue g ia nt h yssop (Agastache foeniculum) <br />• Purp le p r a irie clover (Dalea purpurea) <br />• Can a d a t ic k trefoil (Desmodium canadense) <br />• Ro u g h blaz ing st a r (Liatris aspera) <br />• Wild be r ga m o t (Monarda fis tulosa) <br />Additional Resources <br />• Vid eo o n Can a d a thistle id e ntificat io n (Unive r sity o f Wisco n si n ) <br />• M inn esota Departme nt of Agric ultu re Th istle I den t ificatio n <br />• Can a da Thistle Fact Sheet (MDA) !PDF ! !Ex u <br />• M i nne sota Noxio us W e eds (MN DOT) i PoF I n x,1 <br />• Minnesota De p a rtment o f A g ric ulture T h is tle Biocontro l <br />• Unive r sity of Minnesot a Exten sion <br />• North Da kota De p t. of A g r iculture Fact S h eet <br />• US Forest Service Fact S h eet <br />• Pla n t Con ser vat io n Allia n ce Fact S h eet <br />• I nvasive a nd N a tive Th istle Ide nt ificatio n (South Da k o t a St a t e Unive r sity) <br />lPDF I <br />www.dnr .state.rnn.us/i nvas iws/terrestri alpl ants/her baceous/canadathi sUe.htm 212