Perennial weed with persistent rhizomes that may be spread or transported by cultivation equipment or also in burlaped nursery stock infested with rhizomes. Leaves are 2 to 4 inches long, 1 to 3 inches wide, alternately arranged on the stem, deeply lobed, and have a distinctive aroma. Leaves on the upper portions of the plant are more deeply lobed and may lack petioles. Leaf undersides are covered with soft, white to gray hairs, while upper leaf surfaces may be smooth to slightly hairy. Stems may reach 5 feet in height and often become woody with age. Flowers are inconspicuous and occur in clusters at the top of the plant. The fruit is an achene that encloses the seed; however, viable seed are rarely produced in North America (4).
|Table 1. Mugwort control in no-till corn with corn herbicides during 1995 and 1996 in Westmoreland County, Virginia (3)|
|End of Season Mugwort Control (0-100%)|
|Hornet + 2, 4-D||4 ozs + 1 pt||8||53||79||45||55||76|
|Stinger + 2, 4-D||1/3 pt + 1 pt||10||71||65||36||39||86|
|Stinger + 2, 4-D||2/3 pt + 1 pt||70||81||83||39||53||93|
|LSD (0.05): Herbicides:||12||8|
|LSD (0.05) Timing:||9||7|
As illustrated in Figure 1, mugwort can be selectively removed from grass pastures and hayfields with either Stinger® or Banvel® (1). However, extremely high rates of Banvel® will be required to provide greater than 80% mugwort control at 1 year after treatment (YAT), whereas Stinger® will provide equivalent or higher levels of mugwort control at much lower application rates. These results also indicate that relatively high application rates of Roundup Ultra® will provide good mugwort control at 1 YAT in those situations where a nonselective herbicide may be applied. Additional experiments conducted in Virginia during 1998 and 1999 revealed that sequential treatments of certain herbicides made at 7 week intervals is also an effective mugwort control strategy (2). For example, three sequential treatments of 2, 4-D amine and 2, 4-D ester at 4 qts/A provided greater than 70% mugwort control at 1 year after treatment. Similar levels of mugwort control were also achieved with 2 sequential applications of Banvel® at 2 qts/A, and only 1 application of Stinger® at 2/3 pt/A was required to achieve even higher levels of control. Other experiments conducted in Virginia revealed that overall there was no significant difference in mugwort control when herbicides were applied to vegetative- vs. flowering-stage mugwort.
|Table 2. Mugwort control at 1 year after treatment (YAT) following three sequential herbicide treatments during 1998 and 1999 (2).|
|Treatment||Rate||1 Application||2 Applications||3 Applications|
|product/A||----------------- % Control (0-100%) b ------------------|
|2, 4-D Amine||4 qts||12||39||70|
|2, 4-D Ester||4 qts||17||46||73|
|Roundup Ultra||4 qts||63||54||76|
|LSD (0.05): herbicide treatments (columns):||23|
|LSD(0.05): applications (rows):||12|
|a Indicates sequential herbicide applications made at 7-week intervals.|
|b Based on % reduction in shoot weight at 1YAT.|
Bradley, K. W. and E. S. Hagood, Jr. 2001. Influence of sequential herbicide treatment, herbicide application timing, and mowing on mugwort (Artemisia vulgaris) control. Weed Technol. 15.
Day, M. Y., E. S. Hagood, Jr., and S. M. Johnson. 1997. Evaluation of herbicide programs for mugwort control in corn. Proc. Northeast. Weed Sci. Soc. 51:34.
Uva, R. H., J. C. Neal, and J. M. DiTomaso. 1997. Weeds of the Northeast. Ithaca, New York: Cornell University Press. 397 p.
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Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Alan L. Grant, Dean, College of Agriculture and Life Sciences; Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; Jewel E. Hairston, Administrator, 1890 Extension Program, Virginia State, Petersburg.
May 1, 2009