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.

Issue link: http://gcmdigital.gcsaa.org/i/1042517

Contents of this Issue

Navigation

Page 75 of 99

74 GOLF COURSE MANAGEMENT 11.18 Seedhead suppression in spring Figure 2. Comparison of annual bluegrass seedhead suppression from winter applications of snow mold fungicides alone and no spring programs versus snow mold fungicides mixed with ethephon (Proxy) before snow cover in November (pre-) and/or after snow melts in February (post-), followed by standard spring seedhead programs over the winter of 2016-2017 in Utah and Colorado. Within each trial (Utah or Colorado), values of % control followed by different letters are significantly different. Complete treatment details are found in Table 1. Winter applications of ethephon have consistently improved seedhead suppression in spring on cool-season greens. † Syngenta fungicides ‡ Bayer fungicides Fungicides ‡ only + spring program Fungicides ‡ + Proxy (Pre-) + spring program Fungicides † + Proxy (Pre-) + spring program Fungicides ‡ + Proxy (Post-) + spring program Fungicides † + Proxy (Post-) + spring program Fungicides ‡ + Proxy (Pre- & Post-) + spring program Fungicides † + Proxy (Pre- & Post-) + spring program Fungicides ‡ only + spring program Fungicides ‡ + Proxy (Pre-) + spring program Fungicides † + Proxy (Pre-) + spring program Fungicides ‡ + Proxy (Post-) + spring program Fungicides † + Proxy (Post-) + spring program Fungicides ‡ + Proxy (Pre- & Post-) + spring program Fungicides † + Proxy (Pre- & Post-) + spring program Utah Colorado 0 10 20 30 40 50 60 70 80 90 100 Suppression (% control) 68 c 81 ab 88 ab 80 bc 89 ab 87 ab 90 a 53 c 74 b 82 ab 74 b 81 ab 80 ab 91 a Treatment effects Figure 3. Snow mold fungicides mixed with ethephon (Proxy) in winter did not influence seedhead control in spring, and not using PGRs in spring resulted in numerous seedheads (A). Seedheads were suppressed with tradi - tional spring Proxy + Primo programs (B), but control was improved with a winter application of Proxy mixed with the fungicides before spring programs at (C) a pre-snow tim - ing in November or (D) a post-snow timing in February; (E) using both a pre-snow and post-snow application provided better control. Photos show small areas within single plots and may not represent the full scope of seedhead suppression. A B C D E

Articles in this issue

Archives of this issue

view archives of Golf Course Management - NOV 2018