Wednesday, November 15, 2006 - 10:45 AM

A comparison of re-seeding intervals following weed control in pastures.

Patrick Burch, Dow Agrosciences, Dow AgroSciences, 3425 Elk Creek Drive, Christiansburg, VA 24073, Robert Masters, "Dow AgroSciences, LLC", 9335 Windrift Way, Zionsville, NE 46077-8962, Edward S. Hagood, VA Tech, 418 Price Hall, Blacksburg, VA 24061, William W. Witt, University of Kentucky, Building North, Room N-106E, Lexington, KY 40546-00914, Kenneth Moore, "Dep of Agronomy, 1571 Agronomy Hall", Iowa State Univ., Ames, IA 50011-1010, United States of America, Walter Schacht, Univ. of NE-Dept. of Agron & Hort., PO Box 830915, Lincoln, NE 68583-0915, United States of America, and Kevin W. Bradley, University of Missouri, 210 Waters Hall, Columbia, MO 65211.

Aminopyralid is a new systemic herbicide developed by Dow AgroSciences specifically for use on rangeland, pasture, rights-of-way, such as roadsides for vegetation management, Conservation Reserve Program acres, non-cropland, and natural areas.  Formulations include MilestoneTM herbicide and ForeFrontTM R&P herbicide. Milestone is formulated as a liquid containing, 2 lbs ae/gal of aminopyralid as a salt.  ForeFront R&P is also formulated as a liquid containing 0.33 lbs ae aminopyralid + 2.67 lbs ae 2,4-D/gal.  The herbicides have postemergence activity on established broadleaf plants and provide residual control of later emerging susceptible plants. The objective of this summary is to evaluate the performance of aminopyralid containing products (MilestoneTM and ForeFrontTM R&P) on key pasture weeds and to evaluate replanting intervals for legumes.

Milestone alone controls many important primary weeds in pastures including: tall ironweed, Canada thistle, broadleaf dock, musk thistle, plumeless thistle, and wingstem. The addition of 2,4-D in the ForeFront R&P formulation provides broad spectrum control that includes: plantain, dandelion, and buckbrush. Secondary weeds that emerged after application and were controlled by aminopyralid containing products include: horsenettle and cocklebur. Primary and secondary weeds can impede animal grazing and reduce available forage.  Along with primary and secondary weed control, legumes are controlled as well; therefore, re-establishment of legumes is necessary.  Intervals for fall and spring plantings are reviewed.