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Page 2 of 23 <br />Leafy spurge <br />Manat-ement <br />A <br /> <br />Appendix <br /> <br />?- <br />Leafy spurge is difficult to manage and can recover from almost any control effort. Therefore. a <br />management scheme that combines control methods over four to five years is recommended. Even after <br />that time, monitor intcstations for recurrence and adopt a maintenance program. <br />Mechanical Control of Leaf,N Spurge <br />Vigorous grass growth is ;in important aspect of leafy spurge control. Over-grazing stresses grasses and <br />makes them much less competitive with weeds, leak spurge in particular. Irrigation, where applicable, may <br />favor grass growth and make it more competitive with leafy ;purge. <br />Chemical Control of Leafy Spurge <br />For optimum leafy spurge control. proper timing of herbicide application is imperative. Research from <br />North Dakota State University indicates that Tordon 22K (picloram)'_.4-D. Banvel,'Vanquish,Clarity <br />(dicamba) are most effective when applied in spring when true flowers emerge (not just bracts). Fall <br />application to leafy spurge regrowth also is good timing for these herbicides. <br />Roundup (glyphosate) is most effective when applied sequentially 11.0 quart per acre (A) at one month <br />intervals, coupled with fall grass seeding. Make the first application at the beginning of June and a second <br />application one month later. Occasionally, leafy spurge will recover from these Roundup treatments. An <br />application of 2.4-D (2.0 quartiA) in September can control regrowth. Sow perennial busses in late fall. <br />Tordon is the most eftMive herbicide for leafy spurge control. Treat large. readily accessible areas with I <br />quart, A for three to four consecutive years. More remote arras may he treated +vith 2 quarts ,A for two <br />consecutive years or once every other year for three years, depending on leafy spurge recovery after the