Golf Course Management

MAY 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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62 GOLF COURSE MANAGEMENT 05.19 GCSAA research update Editor's note: The summaries presented here are progress reports of research projects funded by GCSAA through funds it receives from the Environmental Institute for Golf, the association's philanthropic organization. Each year, a research proposal review committee made up of scientists, superintendents and two GCSAA board members reviews proposals submitted by researchers and selects projects for funding by GCSAA. Articles on the final results of the research highlighted here will appear in future issues of GCM. Information about the most recent grants awarded by GCSAA is in Front Nine in this issue of GCM. (report) Surveying herbicide resistance in annual bluegrass populations of golf course turf James T. Brosnan, Ph.D. José Javier Vargas, M.S. Greg K. Breeden, M.S. Recently, our team began a two-year proj - ect surveying annual bluegrass (Poa annua) populations of golf course turf throughout Tennessee and screening plant material col - lected for resistance to pre- and post-emer- gence herbicides. Better understanding the scope of herbicide resistance in annual blue - grass populations of Tennessee golf courses will have many benefits for superintendents, including: • Identifying herbicides that are no longer ef - fective for annual bluegrass control, thereby eliminating wasteful pesticide applications from entering the environment. • Identifying herbicides that are still working on annual bluegrass to ensure that superin - tendents are making only effective applica- tions. • Providing baseline data for understanding the full extent of the resistance problem on a large scale rather than relying on case-by- case experiences of resistance at a single lo - cation. What has been done Plant collection In East, Middle and West Tennessee, 90 public, private and semiprivate golf courses with a range of maintenance budgets were surveyed from Jan. 3 to Feb. 14, 2018. Survey - ors randomly selected one hole at each course and walked the length of that hole, sampling annual bluegrass present above a benchmark density threshold (~11 plants/square yard). Collected plants were transplanted into glass - Where Poa annua is not a golf course's grass of choice, it is considered a pest because its color and growth habit differ from the desired grasses, making it a visual blight as well as a possible impediment to play. Photo by Greg Breeden

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