Yellow starthisle has been a problem in rangeland for many years. It has recently been found in many vineyards. The website listed  below is an excellent resource for starthistle biology and management options

 Yellow Starthistle Management Guide:

http://www.cal-ipc.org/ip/management/yst.php 

The Guidelines cover all aspects of Yellow Starthistle including the lifecycle and grazing management. If you still have YST questions you can contact me at jaroncoroni@ucdavis.edu

or you can contact our Livestock advisor- Morgan Doran at mpdoran@ucdavis.edu or visit his web site at: http://cesolano.ucdavis.edu/Livestock_and_Range_Management/

For more information on other invasive weeds go to the California invasive Plant Councils home page at http://www.cal-ipc.org/