Golf Course Management

FEB 2019

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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70 GOLF COURSE MANAGEMENT 02.19 in this study apply to other fungicide combi- nations as well. e results from the propiconazole uptake study were less conclusive, though important information related to propiconazole uptake at colder temperatures is still present in the data set. For instance, the apparent lack of signifi - cant mobility above 0.44 inch, no matter the temperature, has important implications for higher-cut turf, and the nearly complete lack of any upward mobility above 0.44 inch at 34 F is important to consider when making snow mold fungicide applications. If we were to conduct the uptake experiment again, we would likely conduct it in a hydroponic sys - tem, which would eliminate the variability provided by the growing media and more pre - cisely allow measurement of uptake of propi- conazole out of the water, into the roots and eventually into the leaves. Acknowledgments We greatly appreciate the generosity of the superintendents who hosted trials at their golf courses: Jay Pritzl, Timber Ridge Golf Club in Minocqua, Wis.; Scott Sann, Greenwood Hills Golf Course in Wausau, Wis.; and Tyler Gerrits, Bull's Eye Country Club in Wisconsin Rapids, Wis. We also thank GCSAA and the Wisconsin GCSA for fund - ing this research. Literature cited 1. Blunt, T., T. Koski and N. Tisserat. 2013. Typhula blight severity as influenced by the number of preven - tative fungicide applications and snow compaction. Online. Plant Health Progress doi:10.1094/PHP- 2013-0821-01-RS 2. Hsiang, T., N. Matsumoto and S.M. Millett. 1999. Biology and management of Typhula snow molds of turfgrass. Plant Disease 83:788-798. 3. Koch, P.L. 2017. Optimal fungicide timing for sup - pression of Typhula blight under winter covers. Agronomy Journal 109:1771-1776. doi:10.2134/ agronj2016.04.0241 4. Koch, P.L., J.C. Stier and J.P. Kerns. 2015. Snow cover has variable effects on persistence of fungi - cides and their suppression of microdochium patch on amenity turfgrass. Plant Pathology doi: 10.1111/ ppa.12379 5. Mann, R.L., and A.J. Newell. 2005. A survey to determine the incidence and severity of pests and diseases on golf course putting greens in England, Ireland, Scotland, and Wales. International Turfgrass Society Research Journal 10:224-229. 6. Smiley, R.W., P.H. Dernoeden and B.B. Clarke. 2005. Compendium of Turfgrass Diseases. 3rd edition. APS Press, St. Paul, Minn. Kurt Hockemeyer is Turfgrass Diagnostic Lab Manager and Paul Koch (plkoch@wisc.edu) is an assistant profes - sor in the Department of Plant Pathology at the University of Wisconsin–Madison. • The most effective application timing of fungicides for snow mold control has been debated for some time. • This study clearly demonstrated that timing of fungicide applications plays a critical role in effective snow mold control, but more research is needed because only one of the three sites in our three-year study developed snow mold. • We intend to continue this study over more locations to determine whether an HDD- based model can be effective in timing snow mold fungicides. • The study of uptake of propiconazole was not conclusive, but the lack of uptake beyond 0.44 inch above ground at 34 F is an important consideration when timing snow mold fungicide applications. Soil temperatures in Minocqua, Wis., 2015-2017 70 60 50 40 30 20 10 0 Sept. 1 Sept. 15 Oct. 1 Oct. 13 Nov. 2 Pre-snow 2015 2016 2017 Soil temperature ( ºF at 2 inches) Figure 3. Soil temperature (at a depth of 2 inches) at the research plot in Minocqua, Wis., during 2015, 2016 and 2017. The pre-snow treatment was made on Nov. 16 in 2015, Nov. 17 in 2016 and Nov. 14 in 2017. The RESEARCH SAYS

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