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Page 2 of 23 <br />• Leafy spurge <br />• <br /> <br />Management <br />Appendix l <br />~. <br />' J .lam '~~~.~ ~ : ~ ~` ~ ~7~""i_ll ~ a``I <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 infestations for recurrence and adopt a maintenance program. <br />Mechanical Control of Leafy Spurge <br />Vigorous grass growth is an important aspect of leafy spurge control. Over-grazing stresses grasses and <br />makes them much less competitive with weeds, leafy spurge in particular. Irrigation, where applicable, may <br />favor grass growth and make it more competitive with leafy spurge. <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) 2,4-D, BanveWanquish/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 herfiicides. <br />Roundup (glyphosate) is mast effective when applied sequentially (1.0 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 quart/A) in September can control regrowth. Sow perennial grasses in late fall. <br />Tordon is the most effective herbicide for leafy spwge control. Treat large, readily accessible areas with 1 <br />• quardA for three to four consecutive years. More remote areas may be treated with 2 quarts/A for two <br />consecutive years or once every other year for three years, depending on leafy spurge recovery after the <br />