Golf Course Management

MAR 2014

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

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03.14 GOLF COURSE MANAGEMENT 95 Automated irrigation and traffc on annual bluegrass and creeping bentgrass Managing annual bluegrass (ABG) and creeping bentgrass (CBG) at set levels of ir - rigation is becoming a common practice. The objectives of this study were to determine how three set irrigation levels controlled by an au - tomated irrigation system (16%, 12% and 8% water fraction volume [WFV]; integrated sensor system ISS) under various levels of traf - fc affect the performance of CBG and ABG greens. The frst year of data shows overall ABG requires more water to maintain the tar - get WFV. For example, at 8% and 12% WFV, ABG used ~0.5 inch more water per month than CBG. Grass species did not play a role in the amount of water leached, but the level of irrigation did. Target WFVs maintained higher than expected soil volumetric water content (VWC) as measured by hand with time domain refectometry. At 16% WFV, sea - son average VWC was ~28%; at 12% WFV, VWC was ~22%; and at 8% WFV, VWC was ~18%. In addition, a total of ~15 inches of rain occurred during the study (June–September 2013). We recommend close constant moni - toring of VWC when using automated irriga- tion systems that report WFV. Physiological and hormone results will be reported after two years of data. — Emily Merewitz, Ph.D., and Kevin Frank, Ph.D., Michigan State University BMPs' infuence on anthracnose disease control in annual bluegrass turf Over the past decade, management prac- tices such as mowing height, sand topdressing and nitrogen (N) fertility have been shown to infuence anthracnose severity, but it is not known whether these practices interact to af - fect disease severity, fungicide effcacy or play- ability of turf when used in combination. Two feld trials were initiated on annual bluegrass (ABG) turf to investigate these questions. Trial 1 examined the effects of mowing height, N fertility and fungicide programming on an - thracnose severity. N fertility and fungicide programming and the interaction between these factors accounted for a majority of the disease response during the two-year study. Acceptable disease control was achieved with reduced fungicide rates or fewer threshold- based applications of fungicides when greater N fertility and higher mowing height were ap - plied. Trial 2 examined the effects of mowing height, N fertility and sand topdressing on an - thracnose severity and playability of ABG turf. Similar to trial 1, greater N fertility provided the greatest reduction of disease severity, but mowing height had the greatest impact on ball roll distance. Low mowing height (0.09 inch) consistently produced ball roll distance ≥ 10 feet. — Charles J Schmid, James W. Hempfing, Bruce B. Clarke, Ph.D. (clarke@aesop.rutgers.edu), and James A. Murphy, Ph.D. Teresa Carson (tcarson@gcsaa.org) is GCM 's science editor. CUTTING EDGE Teresa Carson Photo by Kevin Laskowski Photo by James W. Hempfing The research described in these summaries is funded in part by the Environmental Institute of Golf. 078-095_March14_TechwellCuttingEdge.indd 95 2/18/14 1:46 PM

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