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Abstract Detail

Conservation Biology

Parrish, Judy [1], Damos, Rachel [2], Dudley, Megan [2], Engelhardt, Megan [2], Forrest, Jessica [2], Mentzer, Natalie [2], Zimmerman, Laura [2].

Ten years of tenacious teasel (Dipsacus laciniatus) eradication research.

Our plant biology laboratory at Millikin University and the Center for Economic Entomology at the Illinois Natural History Survey studied how to reduce the impact of invasive cutleaf teasel, Dipsacus laciniatus, on natural areas and along roadsides. Between 2002 and 2011, we set up five different sets of experiments at Mascoutin Recreation Area in DeWitt County, IL, along Interstate 72 between Decatur and Springfield, and in the greenhouse at Millikin University,examining the effects of mowing and herbicides and their timing on control of teasel. Major conclusions of the field experiments were that 1)Mowing resulted in significantly faster growth of teasel patches than in unmowed plots; 2)Mowing dispersed 95% of seeds within 6m of origin, but over 1% of seeds were moved more than 10m from the origin by mowing; 3)There was no significant difference in viable seed production in mowed and unmowed plots if mowed early in the summer, but if mowed in early July, seed set was significantly reduced; 4) There was no difference in viable seed production of teasel in fertilized and unfertilized plots; 5) Herbicide treatment early in the growing season(April) significantly reduced the amount of seeds produced, but there were no significant differences among effects of glyphosate, triclopyr amine, and clopyralid, or with herbicide application in July or October; 6)Clopyralid application in April significantly reduced rosette dry weight; 7)Glyphosate appeared to severely affect rosettes, causing all leaves to brown, but after 10 weeks, most regrew, especially those with larger diameter roots; and 8)Aminopyralid killed all rosettes with taproots smaller than 1 cm in diameter and 95% of rosettes with taproots larger than 3 cm in diameter (even at ½ the recommended rate). We conclude that best management practices for large patches of cut leaf teasel should include herbicide application early in the growing season, careful timing of mowing early in July (after bolting and before flowering), and use of aminopyralid for spot spraying.

Broader Impacts:

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1 - Millikin University, 1184 W Main St, Decatur, IL, 62522, USA
2 -

invasive species
Cutleaf teasel
Dipsacus laciniatus

Presentation Type: Oral Paper:Papers for Topics
Session: 41
Location: Union C/Hyatt
Date: Tuesday, July 10th, 2012
Time: 2:30 PM
Number: 41003
Abstract ID:874

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