Yellow starthistle (Centaurea solstitialis L.) is a winter annual that was accidentally introduced to the United States in the mid-1800s. It has since become one of the most widespread invasive broadleaf weeds on rangeland and natural areas in the United States.
Read about published research and practical management tips.
Integration of prescribed burning, aminopyralid (Milestone® herbicide) and reseeding for restoration of yellow starthistle-infested rangeland
Guy B. Kyser, Arthur W. Hazebrook and Joe DiTomaso. Invasive Plant Science and Management
Field studies were established at two locations at Fort Hunter Liggett (U.S. Army Training Center) in Monterey County, California . The combination of prescribed burning, application of Milestone® herbicide at 3 fluid ounces/acre, and reseeding of native broadleaf and grass species on both yellow starthistle control and native plant restoration were evaluated over a three-year period. Results of the study indicate that a January or March application of Milestone herbicide integrated with a native perennial grass drill seeding program in January offers the greatest probability of both successful yellow starthistle control and perennial grass establishment.
Control of Yellow Starthistle (Centaurea solstitialis) and Coast Fiddleneck (Amsinckia menziesii) with Aminopyralid (Milestone® herbicide)
Guy B. Kyser, Vanelle Peterson, Steve B. Orloff, Steven D. Wright, Joseph M. DiTomaso. Invasive Plant Science and Management: July-September, Vol. 4, No. 3, pp. 341-348.
This research paper reports on a compilation of several independent field trials comparing the efficacy of Milestone® (aminopyralid) and Transline® (clopyralid) herbicides on yellow starthistle. Results showed that Milestone herbicide is about four times more effective on yellow starthistle compared to Transline herbicide. In the Central Valley of California, complete yellow starthistle control was obtained with Milestone at 3 fl oz/A when applications were made from December through February (optimum timing). Although pre-emergence applications and late-season applications (rosette stage) also control yellow starthistle, those timings were less consistent at lower rates and therefore required higher rates as per label instructions. At two locations, control of the poisonous native plant coast fiddleneck was also evaluated. Unlike Transline, Milestone provided almost complete control of coast fiddleneck when applied in the winter growing season. Applications of Milestone at the rosette stage resulted in a two-fold increase in annual forage grass biomass the following year. Results indicate that Milestone is an effective tool for the management of yellow starthistle and coast fiddleneck and could be incorporated into an integrated management program.
TechLine Invasive Plant News
A summary of field trials conducted in California, Idaho, Washington and Oregon compare the effectiveness of Milestone® and Transline® herbicides for controlling yellow starthistle.
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Milestone® herbicide is not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. When treating areas in and around roadside or utility rights-of-way that are or will be grazed, hayed, or planted to forage, important label precautions apply regarding harvesting hay from treated sites, using manure from animals grazing on treated areas, or rotating the treated area to sensitive crops. Consult the label before purchase or use for full details. Always read and follow label directions
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Revised and updated June 2019.