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) specialty 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.
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Milestone® specialty 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 directionsState restrictions on the sale and use of Transline apply. Consult the label before purchase or use for full details. Always read and follow label directions.
Reviewed and revised October, 2018