Golf Course Management

MAR 2015

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

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03.15 GOLF COURSE MANAGEMENT 99 CUTTING EDGE Teresa Carson Snow mold control with propiconazole Snow molds often require preventive fun- gicide applications for acceptable control in temperate climates. However, timing these ap - plications can be diffcult because of variable environmental conditions in the fall. Some advocate for applications relatively early in the fall before dormancy onset, allowing the growing plant to absorb and translocate any systemic fungicides before snowfall. This may leave the turf and fungicide exposed to the ele - ments for several weeks or more, potentially allowing signifcant fungicide degradation before snow cover. To combat these degrada - tive effects, others advocate for application as close to snowfall as possible. However, the turf is often dormant at this time of year and may not fully absorb and translocate any systemic fungicides applied. In addition, the risk that permanent snow cover will arrive before ap - plication increases signifcantly when applica- tions are late in the year. The purpose of this research is to determine the degree of propi - conazole uptake at varying temperatures and to assess the most effective application timings for snow mold control in the feld. The frst objective will be assessed by applying radio - labeled propiconazole to the base of creeping bentgrass plants in growth chambers set at 62 F, 50 F, 43 F and 32 F (16.6 C, 10 C, 6 C and 0 C) and measuring the movement of the fungicide molecule in the plant at each tem - perature. The second objective will be met by applying common snow mold fungicides at six different timings throughout the fall at three different golf courses in Wisconsin that typi - cally experience high, medium and low snow mold pressure. The results of this research will provide superintendents with additional infor - mation on optimal timing for effective snow mold control. — Sam Soper, Bruce Schweiger and Paul Koch, Ph.D. (plkoch@wisc.edu), Univer- sity of Wisconsin, Madison, Wis. Fungicide alternatives for Microdochium patch Microdoc ium nivale is a major turfgrass disease in cool, humid regions and currently traditional fungicides are the only known methods of control. Increasing pesticide re - strictions have generated concern regarding the management of M. nivale. The objective of this research is to evaluate rolling, as well as the application of mineral oil, sulfur and potassium-phosphite as fungicide alternative options for management of M. nivale on Poa annua putting greens. A two-year feld exper - iment conducted on a sand-based P. annua putting green built according to USGA recommendations was initiated in Septem - ber 2013 and will conclude in June 2015 at Oregon State University, Corvallis, Ore., and Washington State University, Puyallup, Photo by Paul Koch Photo by Clint Mattox Wash. Treatments in this experiment include rolling fve days a week, and mineral oil (Civi - tas One) at 8.5 ounces/1,000 square feet (2.7 milliliters/square meter), Sulfur DF at 0.25 pound/1,000 square feet (1.22 grams/square meter), and PK Plus at 6 ounces/1,000 square feet (1.9 milliliters/square meter), applied every two weeks, as well as an untreated con - trol. All possible combinations of these treat- ments are included in the study. Initial results have shown that the combination of Sulfur DF and PK Plus and also Civitas One applied in combination with PK Plus, Sulfur DF or PK Plus and Sulfur DF are providing the greatest reduction in disease. At the Corvallis location, abiotic damage has been observed in winter with the Civitas One treatments, espe - cially when combined with the rolling treat- ments. Further research is currently being conducted to determine how abiotic damage from repeated Civitas applications and poten - tial pH imbalances from sulfur applications can be mitigated. — Clint Mattox, Alec Kow- alewski, Ph.D. (alec.kowalewski@oregonstate. edu), and Brian McDonald, M.S. Teresa Carson (tcarson@gcsaa.org) is GCM's science editor. The research projects described below were all funded by a grant to GCSAA from the Environmental Institute for Golf.

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