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Page 2 of 23 <br />Leafy spurge <br />; VV <br />1-7 <br />'4%, zj <br />Management <br /> <br />Appendix I <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 tour to five years is recommended. Even after <br />that time. monitor infestations for recurrence and adopt a maintenance program. <br />Mechanical Control of LeafN Spurge <br />Vigorous grass growth is an important aspect of Icaty spurge control. Over-grazing stresses gmsses and <br />makes them much less competitive with weeds, Icafy spurge in particular. Irrigation, where applicable, ntay <br />favor grass gromh and make it more competitive with leafy spurge. <br />Chemical Control of Leafy Spurge <br />For optimum leaf; spurge control, proper timing of herbicide application is imperative. Research from <br />North Dakota State University indicates that Tordon 22K (picloram) 2.4-D, Banvcl'V'anquislv'C'larity <br />(dicamba) are most effecuvc when applied in spring when tnic tlowcrs emerge (nut 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 (1.0 quart per acre (A) at one month <br />intervals, coupled with fall grass secdinz. 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 treamtents. 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 spurge control. Treat large, readily accessible areas with I <br />quarvA tier three to four consecutive years. More remote areas may he treated with _' quarts/A for two <br />consecutive years or once every other year for three years. depending on lealy spurge recovery after the <br />