Full TGIF Record # 42159
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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 (Cirsium Arvense (L.) scop.) management in roadsides
Section:Industrial, forestry, turf and aquatics
Other records with the "Industrial, forestry, turf and aquatics" Section
Meeting Info.:St. Louis, Missouri: December 10-12, 1996
Source:Proceedings of the North Central Weed Science Society. Vol. 51, 1996, p. 103-104.
# of Pages:2
Publishing Information:Champaign, IL: North Central Weed Science Society
Abstract/Contents:"Infestations of Canada thistle, one of three noxious weeds in Wisconsin, have increased along roads and in other nondisturbed areas. In 1995, the Wisconsin Department of Transportation, AGSTAT, and the Department of Agronomy at the University of Wisconsin-Madison began a four year project to study how to control Canada thistle in roadsides. The primary objective of the study is to determine how frequently clopyralid (420 g/ha) needs to be applied to control this weed. Secondary objectives are to determine if prior mowing or tank mixing with chlorsulfuron (clopyralid at 280 g/ha + chlorsulfuron at 13 g/ha) enhance control. To meet those objectives we established a 25 treatment study at two sites in southern Wisconsin (Avoca and Oregon) with three replications per site in June 1995. The October 1996 Canada thistle control ratings are shown in Table 1. The analysis of variance showed that there were highly significant differences among the treatments. However, the difference between sites and the site X treatment interaction was not significant. Thus, the data in Table 1 are means of six observations over both sites. The analysis of variance also found that the error term was not homogeneous among treatments. Transformations and other attempts to remove the heterogeneity were unsuccessful. As a result, the treatment means can not be compared with a single statistic such as the LSD, so the data were reanalyzed in more homogeneous groups and the 90% confidence intervals reported. Mowing once, twice, or even three times all averaged 13 to 17% control with 90% confidence intervals of approximately 20%. That was significantly better than the untreated check, but not satisfactory. One application of clopyralid averaged 53 to 67% control, which was significantly better than mowing, but still not satisfactory. The single application clopyralid treatments were also in the most variable group; their 90% confidence intervals cover a range of over 46%. Clopyralid applied twice provided excellent control (>95%) as long as both applications were not in the same year. Three applications also produced excellent control. The treatments that provided excellent control did so consistently; their 90% confidence intervals covered a range of about 10%. The excellent control ratings for multiple applications must be considered preliminary because the single application treatments also gave excellent control ratings (>95%) initially, but they deteriorated 1.3% per month for spring 1995 application and 3.2% per month for fall 1995 application. We will follow these plots for two more years to see if the multiple application plots show a similar decrease in Canada thistle control. Mowing prior to clopyralid treatment and tank mixing chlorsulfuron with clopyralid did not enhance control."
See Also:Updated version appears in Proceedings: North Central Weed Science Society, vol. 53 1998, p. 100-101, with variant title "Long-term Canada thistle management in roadsides: 1995 to 1998", R=230153. R=230153
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Baldock, J. O., and J. D. Doll. 1996. Long-term Canada thistle (Cirsium Arvense (L.) scop.) management in roadsides. Proc. North Cent. Weed Sci. Soc. 51:p. 103-104.
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