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Musk Thistle <br />Pa <br />horridus. This weevil attacks the crown area of musk thistle rosettes and kills or weakens <br />the plant before it bolts. This weevil is being distributed throughout Colorado by the <br />Department of Agriculture. It tends to be more effective than the seed head weevil, <br />Integrating Control Methods <br />To combine chemical and biological control methods, apply herbicides when they won't <br />interfere with insect development. That is, allow the control insects to complete their fife <br />cycle. Or use herbicides in areas that aren't sensitive to their use and biological control in <br />areas where herbicides are impractical or environmentally unsafe. <br />Cultural methods that favor desirable plant growth can be combined with chemical or <br />biological control by superimposing proper grazing management and seeding. <br />t Colorado State University Cooperative Extension weed science specialist and professor, bioagricultural sciences <br />and pest management. 9/98. Reviewed 3/03. 1Volume~to volume, e.g., a ratio of 1 quart per 100 gallons of spray <br />solution. <br />Go to top of this Daae. <br />Updated Monday, August 23, 2004. <br />AnswerLink I CSU AgNews I Employment I Other Links i Publications I Staff Resources I Site Search <br />CE ome I CSU Home I RamPOint I About Us I Calendar I Staff Directory I Webmaster <br />Disclaimer I Eaual Opportunity INon-Discrimination Statement <br />n <br />http://www.ext.colostate.edu/pubs/natres/03102.htm1 6/20/2005 <br />