Full TGIF Record # 225022
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Web URL(s):http://www.ncwss.org/proceed/NCWSS-2011-Proceedings.pdf#page=111
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Author(s):Halstvedt, Mary B.; Peterson, Vanelle; Lym, Rodney G.; Moechnig, Mike J.; Becker, Roger
Author Affiliation:Halstvedt: Dow AgroSciences, Billings, MT; Peterson: Dow AgroSciences, Mulino, OR; Lym: North Dakota State University, Fargo, ND; Moechnig: South Dakota State University, Brookings, SD; Becker: Univ. of Minnesota, St. Paul, MN
Title:Native grass establishment after invasive weed control with aminopyralid
Section:Invasive plants symposium
Other records with the "Invasive plants symposium" Section
Meeting Info.:Milwaukee, Wisconsin: December 12-15, 2011
Source:66th Annual Meeting of the North Central Weed Science Society. Vol. 66, 2011, p. [111-112].
# of Pages:2
Publishing Information:Champaign, Illinois: North Central Weed Science Society
Keywords:TIC Keywords: Aminopyralid; Application timing; Clopyralid; Cool season turfgrasses; Herbicide evaluation; Invasive weeds; Picloram; Warm season turfgrasses; Weed control
Abstract/Contents:"Invasive plants often interfere with and displace desirable plant populations making site re-vegetation necessary. Aminopyralid will control many invasive species and it is critical for land managers to understand how aminopyralid is best used to control invasive plants and facilitate establishment of desirable grass species. The current label for aminopyralid-containing products allows for its use on established desirable grasses or it can be applied in the spring before a fall grass planting. The objective of this research was to determine if grasses can be planted either as a dormant seeding or in the spring following an autumn herbicide application. Research was conducted at University of Minnesota, North Dakota State University and South Dakota State University research farms. Experiments were designed as randomized complete blocks with four replications per treatment combination. Pre-plant herbicide treatments were applied on September 15, 16, and 22, 2009 at the ND, MN, and SD locations respectively. Treatments included aminopyralid at 0.75, 1.75, and 3.5 oz ai/A (2 times the maximum registered use rate), clopyralid at 6 oz ai/A, and picloram at 8 oz ai/A. Grasses planted in these experiments were cool season grasses (intermediate wheatgrass, Canada wildrye, and green needlegrass) and warm season grasses (big bluestem, little bluestem, sideoats grama, switchgrass, and indiangrass). The SD location included 2 planting times, November 9, 2009 and April 4, 2010, grasses were planted in ND on April 22, 2010 and in MN on November 17, 2009. The non-treated checks were hand weeded for most of the early season. Plant count (number of plants per 0.5 meter of row) and frequency of occurrence (%) were measured in July 2010 at all sites. The planting date main effect was significant (P<0.05) for grass counts and frequency of occurrence. The herbicide by planting interaction for counts of big bluestem planted in the spring was the only significant (P<0.05) interaction. Averaged across herbicide treatment and grass species (except big bluestem) the average grass count from fall plantings was 2.5 plants per 0.5 meter row compared to 5.0 plants per 0.5 meter row for spring plantings. There were no differences across herbicide treatments for fallplanted grasses for either cool or warm season grasses. For the spring planting, the combined warm-season grasses (except big bluestem) showed a trend for a greater number of plants in herbicide-treated plots compared to non-treated areas. Cool-season grass counts in spring plantings in aminopyralid-treated plots ranged from, 7.2 to 7.6 plants per 0.5 meter row compared to clopyralid at 6 oz ai/A and 8 oz ai/A of picloram at 6.6 and 5.2 plants per 0.5 meter row respectively and 5.4 in non-treated plots. There was a trend for counts of warm-season grasses to be less in plots treated with aminopyralid at 3.5 oz ai/A, clopyralid, and picloram (mean of 3.7, 4.2, and 3.2 plants per 0.5 m of row, respectively) when compared to 5.7 plants per 0.5 m of row in plots treated with 1.75 oz ai/A aminopyralid and higher than the 2.2 plants in non-treated plots. Based on these results aminopyralid can be applied in the autumn and several cool- and warm-season grasses planted either as a dormant seeding during the autumn/winter or in the spring and grasses will successfully establish if environmental conditions are favorable. This demonstrates another important utility of aminopyralid, which is to control invasive broadleaf plants and facilitate revegetation of grasses on sites where remnant populations of desirable grasses are insufficient to recover after invasive plant control. These data are corroborated by other field experiments conducted in the western US and confirm aminopyralid fit in rangeland grass revegetation programs."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Halstvedt, M. B., V. Peterson, R. G. Lym, M. J. Moechnig, and R. Becker. 2011. Native grass establishment after invasive weed control with aminopyralid. Proc. North Cent. Weed Sci. Soc. 66:p. [111-112].
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    Last checked: 07/17/2013
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