Golf Course Management

NOV 2018

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

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76 GOLF COURSE MANAGEMENT 11.18 RESEARCH SAYS • Products containing ethephon (e.g., Proxy) are the only PGRs that suppress seedheads and are available for use on golf course turf. • Mixtures of Proxy and some fungicides were compatible, sprayable and not injurious to turf on greens in Utah and Colorado when applied in winter. • Mixing Proxy with fungicides did not affect winter turf quality, but adding Proxy to the tank-mix in winter enhanced seedhead control in spring. • Adding ethephon to the tank-mix in winter also reduces labor by eliminating extra applications. Figure 6. Annual bluegrass seedheads can explode in untreated turf in spring (far left plot) and lower turf quality. Spring PGR programs can provide suppression and improve quality (far right plot) in some years, if timed correctly, but preceding spring programs with winter applications of Proxy (middle plot) has consistently enhanced suppression and quality in research in Utah and Colorado. winter timings was better than making only a single winter application in some instances. Turf color was not affected by any pre-snow or post-snow fungicide + Proxy treatment at either course (data not shown), supporting the safety of these mixtures on cool-season greens as turf enters and breaks winter dormancy. Summary and discussion Proxy mixtures with some fungicides com- monly used in winter for snow mold protec- tion were compatible, sprayed well and did not injure cool-season putting green turf in Utah and Colorado. No reduction in turf quality or color was observed as a result of ap - plying Proxy with these fungicides. In addi- tion, applying Proxy in winter improved an- nual bluegrass seedhead suppression in spring. Adding Proxy in the tank with a snow mold fungicide improves productivity by eliminat - ing extra spray events at a time of year when turf is not growing. Including Proxy in win - ter also provides greater flexibility for timing the initiation of spring PGR programs. e concept and practice of applying ethephon in winter is gaining popularity and, so far, seems to have positive results. is research fills an - other gap and continues toward developing the most comprehensive annual bluegrass seedhead programs for northern regions with snow cover. Disclaimer: is information is not a recom - mendation but is meant to be thought-provok- ing. It is impossible to test every pesticide mix- ture on every turf species and variety under all conditions. Always refer to and follow all label directions when tank-mixing. Contact prod - uct representatives and test tank-mixtures on small areas before using in a large area. Funding Funding for this research was provided by the Rocky Mountain Environmental Golf In - stitute (the philanthropic organization of the Rocky Mountain Golf Course Superinten - dents Association) and Professional Turfgrass Solutions LLC. Turf quality of untreated and treated plots Acknowledgments e author expresses his tremendous grati- tude to GCSAA superintendents Chuck Sorge and J. Eric Strasheim for hosting these tri - als and for technical assistance. anks also to Bayer Green Solutions Team member Zac Reicher, Ph.D., technical specialist for the western United States, for reviewing the paper for accuracy. References 1. Reicher, Z. 2018. Fall Proxy applications for improved seedhead control in annual bluegrass. (www. talking-turf/2018/august/fall-proxy-applications-for- improved-seedhead-control-in-annual-bluegrass) Accessed Aug. 30, 2018. 2. Van Dyke, A. 2017. Improving seedhead suppres - sion of annual bluegrass: Adding pre- and post- snow applications of ethephon to traditional spring seedhead programs has been shown to improve annual bluegrass seedhead suppression. Golf Course Management 85(11):70-76. Adam Van Dyke ( is the owner and chief scientist of Professional Turfgrass Solutions LLC in South Jordan, Utah. To learn more about winter ethephon applications for improving seedhead con - trol, attend the GCSAA seminar "Plant growth regulators for fine cool-season turf" (1077-01) with Bill C. Kreuser, Ph.D.; Erik Ervin, Ph.D.; and Adam Van Dyke, M.S., CPAg, at the 2019 Golf Industry Show in San Diego.

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