Full TGIF Record # 230153
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Publication Type:
Author(s):Baldock, Jon O.; Doll, Jerry D.
Author Affiliation:Baldock: Research Director, AGSTAT, Verona, WI; Doll: Professor, Department of Agronomy, University of Wisconsin, Madison, WI
Title:Long-term Canada thistle management in roadsides: 1995 to 1998
Section:Industrial, forestry, turf, and aquatics
Other records with the "Industrial, forestry, turf, and aquatics" Section
Meeting Info.:St. Paul, Minnesota: December 8-10, 1998
Source:Proceedings: North Central Weed Science Society. Vol. 53, 1998, p. 100-101.
# of Pages:2
Publishing Information:[Champaign, Illinois]: [North Central Weed Science Society]
Abstract/Contents:"Canada thistle is one of three noxious weeds in Wisconsin and its incidence appears to be increasing along roads and in other non-disturbed areas. To combat the spread of Canada thistle, the Wisconsin Department of Transportations, AGSTAT, and the Department of Agronomy at the University of Wisconsin-Madison initiated a four-year project on controlling it in non-disturbed sites. The primary objective of the study was to determine how frequently clopyralid (420 g/ha) should be applied to control this weed. Secondary objectives were to determine if prior mowing or tank mixing with chlorsulfuron (clopyralid at 280 g/he + chlorsulfuron at 13 g/ha) enhance control. To meet those objectives we established 25-treatment trials at Avoca and Oregon in southern Wisconsin. Each trial was laid out with three replications and the first treatments were applied in June 1995. Analysis of variance of the June 1998 visual ratings of Canada thistle control showed that the differences between sites and the interaction between sites and treatments were not significant. Thus the treatments, which were significantly different, were averaged over sites (Table 1). In spite of some heterogeneity among the residuals for treatments, the LSD based on the site by treatment interaction term is also reported because no transformation or simple partitioning of the data removed the heterogeneity. Comparison of the treatments at a given time does not give a complete picture of their effects because of the time since the last application varies. regression analysis of the percent control as a function of the months after the last application showed that Canada thistle control decreased at 1 to 3% per month regardless of the number of clopyralid applications, the time of initial application, and whether or not the thistles were mowed prior to herbicide application. Based on these results, a single application of clopyralid at the full labeled rate with follow-up scouting to determine when another application is needed is the best approach to managing Canada thistle in roadsides."
See Also:Original version appears in Proceedings: North Central Weed Science Society, vol. 51 1996, p. 103-104, with variant title "Long-term Canada thistle (Cirsium Arvense (L.) scop.) management in roadsides", R=42159. R=42159
Note:This item is an abstract and table only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Baldock, J. O., and J. D. Doll. 1998. Long-term Canada thistle management in roadsides: 1995 to 1998. Proc. North Cent. Weed Sci. Soc. 53:p. 100-101.
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