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Musk i nistie rage a or s <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 life <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 />1 Colorado State University Cooperative Extension weed science specialist and professor, bioagricuftural sciences <br />and pest management. 9/98. Reviewed 3/03. 2Volume to volume, e.g., a ratio of 1 quart per 100 gallons of spray <br />solution. <br />Go to top of this page. <br />Updated Monday, August 23, 2004. <br />1 <br />AnswerLink I CSU A News I Employment I tither Links I Publications I Staff _.Resources 15j te_Seareh <br />CE Home I ( -L Home I RamR int I About Us I Calendar I Staff Directory I Webmaster <br />Disclaimer I Equal Opportunity I Non-Discrimination Statement <br />a <br />http://www.ext.colostate.edu/pubs/natres/03102.html 6/20/2005