2009-09-09_REVISION - M2000115 (3)

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Page 2 of 23 Leafy spurge Appendix I c ` Yr? ,t ..? } 7 . 141 ;P `.A ' ??li???:. ,irk - '? . .Q ?? ?`'?`???i??`.'1?f Management Leaty spurge is difficult to manage and can recover from almost any control effort. Therefore, a management Scheme that combines control methods over four to five years is recommended. Even after that time, monitor intcstations for recurrence: and adopt a maintenance program. Mechanical Control of Leafy Spurge Vigorous grass growth is an important aspect of leafy spume control. Over-grazing stresses grasses and makes them much less competitive with weeds, leafy spurge in particular. Irrigation, where applicable, may favor grass growth and make it more competitive with leafy spurge. Chemical Control of Leaf) Spurge For optimum leafy spurge control, proper timing of herbicide application is imperative. Research from North Dakota State University indicates that Tordon 22K (picluramj 2,4-1). Banvel,,VanLj Ili Sill Clarity (dreamba) are most effective \eiren applied in spring when true flowers emerge (not just bracts). Fall application to leafy spurge regrowth also is good timing for these herbicides. Roundup (glyphosate) is most effective when applied sequentially (1.0 quart per acre IA) at one month intervals, coupled with fall ![ra3S seeding. Nlake the first application at the beginning of .tune and a second application one month later. Occasionally, leafy spurge will recover ftom these Roundup treatments. An application of 2,4-D (2.I) quart/A) in September can control regrowth. Smv perennial grasses in late fall. Tordon is the most effective herbicide for leafy spurge control. Treat large, readily accessible areas with I quamA for three to four consecutive years. More remote areas may be treated with 2 quarts/A for two consecutive years or once every other year for three years, depending on leafy spurge recovery after (lie