Herbicides may be applied at the seedling, rosette, or bolting stages of yellow starthistle, but higher rates are required to kill larger plants.
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extension.oregonstate.edu/catalog/html/em/em8750/
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However, depending on the timing of application, it does damage or kill most species in the legume family (Fabaceae), as well as the sunflower family (Asteraceae), and this may not be a desired outcome in a control program with the goal of increasing native plant diversity or enhancing a threatened native plant...
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wric.ucdavis.edu/yst/manage/management14.html
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Jul 20, 2002 But we need to take steps to kill it all soon or else we'll have a huge amount of seed Arastradero Preserve | Yellow star thistle plague...
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econ161.berkeley.edu/movable_type/2003_archives/000638....
econ161.berkeley.edu/movable_type/2003_archives/000638.html
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Once it has colonized an area, yellow starthistle can quickly spread and displace other vegetation. Even after control measures have been implemented, yellow star-thistle can quickly re-establish if competitive replacement species are not established.
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www.efn.org/~ipmpa/Noxystar.html
www.efn.org/~ipmpa/Noxystar.html
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Yellow Star Thistle is an invasive plant. It is not native to the United States. The plant was accidentally introduced to the western states over a century ago. Now found in 41 states, Check the label of weed killers at garden centers and hardware stores. Those that kill dandelions will often control star thistle.
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www.ehow.com/how_2282146_control-star-thistle.html
www.ehow.com/how_2282146_control-star-thistle.html
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How to Kill Star Thistle. There are several types of thistle that are commonly called star thistle. Many of these are not native to the US such as the...
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www.ehow.com/how_5678475_kill-star-thistle.html
www.ehow.com/how_5678475_kill-star-thistle.html
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Yellow star thistle is a foreign interloper without natural enemies here to Herbicides can kill yellow star, but there is far too much of the weed for...
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www.kevinroderick.com/thistle.html
www.kevinroderick.com/thistle.html
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Examples of musk thistle invasion following disturbances such as fire [34,38,39], insect kill [75], or other vegetation removal [19] suggest that musk thistle seeds may be present and viable in soil if there is a history of musk thistle plants on site, or if a musk thistle population is nearby.
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www.fs.fed.us/database/feis/plants/forb/carnut/all.html
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But there is another side to yellow star thistle, a side that some longtime ranchers say is often overlooked. Craig Thomsen, UC Davis rangeland ecologist, asked a fifth-generation cow-calf operator why he wasn’t out trying to kill the plants that infested parts of his ranch.
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www.angusjournal.com/articlePDF/Star%20Thistle%2001.09....
www.angusjournal.com/articlePDF/Star%20Thistle%2001.09.pdf
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