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Effect of Aminocyclopyrachlor on Seedling Grasses

  • Katie L. Wirt (a1) and Rodney G. Lym (a1)


When invasive weeds are removed with herbicides, revegetation of native species is often desirable. The extended soil activity of aminocyclopyrachlor is important for long-term weed control but could reduce recovery of native species as well. The effect of aminocyclopyrachlor applied alone or with chlorsulfuron on cool- and warm-season grass species commonly used for revegetation was evaluated. The cool-season grasses included green needlegrass, intermediate wheatgrass, and western wheatgrass, whereas the warm-season grasses were big bluestem, sideoats grama, and switchgrass. A separate experiment was conducted for each species. Aminocyclopyrachlor was applied at 91 to 329 g ha−1 alone or with chlorsulfuron from 42 to 133 g ha−1 approximately 30 d after emergence. Warm-season grasses generally were more tolerant of aminocyclopyrachlor than the cool-season grasses evaluated in this study. Switchgrass and big bluestem were the most tolerant of the warm-season species when aminocyclopyrachlor was applied at 168 g ha−1 and averaged 199 and 150% forage production, respectively, compared with the control. Green needlegrass was the most tolerant cool-season grass. Western wheatgrass was the least tolerant species evaluated because forage production only averaged 32% of the control the year after treatment and thus would not be suitable for seeding if aminocyclopyrachlor was applied. The effect of chlorsulfuron applied with aminocyclopyrachlor varied by grass species. For example, green needlegrass injury 8 wk after treatment (WAT) averaged 30 and 48% when aminocylopyrachlor was applied alone, respectively, but injury was reduced to less than 16% when aminocyclopyrachlor was applied with chlorsulfuron. However, injury on the less-tolerant intermediate wheatgrass ranged from 48 to 92% by 4 WAT when aminocyclopyrachlor was applied alone and from 60 to 86% when chlorsulfuron was included in the treatment.


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Current address of first author: Grant and Sioux Counties Agent, Carson, ND 58529



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Adams, JW, Lym, RG (2015) Quinclorac and aminocyclopyrachlor movement in sandy soils. Invasive Plant Sci Manag 8: 269275
Allendorf, FW, Lundquist, LL (2003) Introduction: population biology, evolution, and control of invasive species. Conserv Biol 17: 2430
Almquist, TL, Lym, RG (2010) Effect of aminopyralid on Canada thistle (Cirsium arvense) and the native plant community in a restored tallgrass prairie. Invasive Plant Sci Manag 3: 155168
Anonymous (2009) DuPont: DPX-MAT28 Technical Bulletin. E. I. du Pont de Nemours and Company. f10dfb94/MAT28TechBulletin.pdf. Accessed January 19, 2014
Barker, WT, Whitman, WC (1988) Vegetation of the Northern Great Plains. Rangelands 10: 266272
Carmer, SG, Nyquist, WE, Walker, WM (1989) Least significant differences for combined analyses of experiments with two-or Three-factor treatment designs. Agron J 81: 665672
Conklin, KL (2012) Aminocyclopyrachlor: Weed Control, Soil Dissipation, and Efficacy to Seedling Grasses. M.S. thesis. Fargo, ND: North Dakota State University. 83 p
Conklin, KL, Lym, RG (2013) Effect of temperature and moisture on aminocyclopyrachlor soil half-life. Weed Technol 27: 552556
DiTomaso, JM (2000) Invasive weeds in rangelands: species, impacts, and management. Weed Sci 48: 255265
DiTomaso, JM, Enloe, SF, Pitcairn, MJ (2007) Exotic plant management in California annual grasslands. Pages 281296 in Stromberg, MR, Corbin, JD, D'Antonio, CM, eds. Californian Grasslands. Berkeley, CA: University California Press
Ehrenreich, JH, Aikman, JM (1963) An ecological study of the effect of certain management practices on native prairie in Iowa. Ecol Monogr 33: 113130
Endres, GJ, Becker, T, Gerhardt, S, Holm, K, Kline, E (2012) Perennial weed control with aminopyralid and aminocyclopyrachlor. Page 25 in Proceedings of the Western Society Weed Science. Reno, NV: Western Society of Weed Science [Abstract]
Gillespie, GR, Nalewaja, JD (1989) Wheat (Triticum aestivum) response to triallate plus chlorsulfuron. Weed Technol 3: 2023
Halstvedt, MB, Peterson, VF, Becker, RL, Lym, RG, Moechnig, MJ (2011) Native grass establishment with aminopyralid. Pages 6364 in Proceedings of the Western Society Weed Science. Spokane, WA: Western Society of Weed Science [Abstract]
Hergert, HJ, Mealor, BA, Kniss, AR (2015) Inter- and intraspecific variation in native restoration plants for herbicide tolerance. Ecol Restor 33: 7481
Hetrick, BAD, Bloom, J (1983) Vesicular-arbuscular mycorrhizal fungi associated with native tall grass prairie and cultivated winter wheat. Can J Bot 61: 21402146
Joern, A, Keeler, KF (1995) Getting the lay of the land: Introducing North American native grasslands. Pages 1224 in Joern, A, Keeler, KF, eds. The Changing Prairie: North American Native Grasslands. Oxford UK: Oxford University Press
Krueger-Mangold, JM, Sheley, RL, Svejcar, TJ (2006) Toward ecologically-based invasive plant management on rangeland. Weed Sci 54: 597605
Lindenmayer, B, Westra, P, Brunk, G, Nissen, S, Shaner, D (2010) Field and laboratory studies with aminocyclopyrachlor (DPX-MAT28). Weed Science Society of America, Denver, CO. Abstract O-281. Accessed September 15, 2015
Lindenmayer, B, Westra, P, Nissen, S, Shaner, D (2011) Characterization of aminocyclopyrachlor, aminopyralid, and clopyralid soil activity. Page 64 in Proceedings of the Western Society of Weed Science. Las Cruces, NM: Western Society of Weed Science [Abstract]
Lym, RG (2009) Evaluation of DPX KJM44-062 for weed control in pasture and rangeland. Pages 911 in Research Progress Report, Western Society of Weed Science. Las Cruces, NM: Western Society of Weed Science
Lym, RG, Tober, DA (1997) Competitive grasses for leafy spurge (Euphorbia esula) reduction. Weed Technol 11: 787792
Mangold, JM (2012) Revegetation: using current technologies and ecological knowledge to manage site availability, species availability, and species performance. Pages 176195 in Monaco, TA, Sheley, RL, eds. Invasive Plant Ecology and Management: Linking Processes to Practice. CABI Invasive Species Series 2. Oxfordshire: CABI Press
Masters, RA, Sheley, RL (2001) Principles and practices for managing rangeland invasive plants. J Range Manag 54: 502527
[NDAWN] North Dakota Agricultural Weather Network (2012) Daily Data Table. Accessed: February 23, 2012
O'Sullivan, A, Kirkland, KJ (1984) Chlorsulfuron reduced control of wild oat (Avena fatua) with diclofop, difenzoquat, and flamprop. Weed Sci 32: 285289
Peters, TJ, Moomaw, RS, Martin, AR (1989) Herbicides for postemergence control of annual grass weeds in seedling forage grasses. Weed Sci 37: 375379
Samuel, LW, Lym, RG (2008) Aminopyralid effects on Canada thistle (Cirsiuim arvense) and native plant species. Invasive Plant Sci Manag 1: 265278
Shantz, HL (1923) The natural vegetation of the Great Plains Region. Ann Assoc Am Geographers 13: 81107
Sheley, RL, Whitson, TD, Carrithers, V, Jacobs, JS, Gehrett, J (2002) Grass response to picloram and clopyralid applied before seeding. Weed Technol 16: 645650
Soil Survey Staff (2011) Natural Resources Conservation Service, U.S. Department of Agriculture. Web Soil Survey. Accessed December 5, 2011
Stevens, R, Burke, IC (2009) Response of rush skeletonweed to postemergence foliar vs. soil treatments of aminocyclopyrachlor, aminopyralid, and clopyralid. Page 43 in Proceedings of the Western Society Weed Science. Albuquerque, NM: Western Society of Weed Science [Abstract]
[USDA–NRCS] U.S. Department of Agriculture (2014) Herbaceous Vegetation Establishment Guide. Accessed September 16, 2015
Vassios, J, Nissen, S, Douglass, C, Lindenmayer, B, Bridges, M, Westra, P, Lair, K (2010) Canada thistle (Cirsium arvense) control and grass tolerance using aminopyralid and aminocyclopyrachlor. Abstract O-222. Lawrence, KS: Weed Science Society of America. &session=7581. Accessed September 15, 2015
Westra, P, Lindenmayer, B, Nissen, S, Shaner, D, D'Amato, T, Goeman, B (2010) Integrating aminocyclopyrachlor into weed management plans. Abstract O-304. Lawrence, KS: Weed Science Society of America. Accessed September 14, 2015


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Effect of Aminocyclopyrachlor on Seedling Grasses

  • Katie L. Wirt (a1) and Rodney G. Lym (a1)


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