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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11.18 GOLF COURSE MANAGEMENT 75 ing in April 2017 at both courses and peaked in mid- to late-May covering 54% (Utah) and 74% (Colorado) of turf that had not been treated in spring. Applying only fungicides in winter and making spring Proxy + Primo applications at each course controlled 68% (Utah) and 53% (Colorado) of seedheads (Figure 2). e fungicides tested did not have a significant effect on seedhead control, but control was improved when the spring pro - grams were preceded by a winter application of Proxy mixed with the fungicides (Figure 3). Including Proxy with fungicides at just the pre-snow timing provided 74% to 88% con - trol, while including Proxy with fungicides at just the post-snow timing provided a similar 74% to 89% control. Efficacy was not greatly improved by including Proxy with fungicides at both winter timings, but one combination fungicide + Proxy treatment applied pre- and post-snow in Colorado was more efficacious than one or two single-application treatments in Utah and Colorado, respectively (Figure 2). e effect of Proxy on fungicide efficacy could not be determined in either trial because no snow mold damage occurred on the greens. Turf safety, quality and color results e mixtures were safe to cool-season greens in winter, as no visible phytotoxicity, crown rising or delay during green-up was ob - served from any treatment (Figure 4). Winter quality was not affected by the fungicides used at the winter timings, but quality in May was improved with the addition of Proxy in win - ter because seedhead control was improved over the spring seedhead programs alone (Figure 5). Untreated turf in spring had the worst quality in May when seedheads peaked. e spring programs of Proxy + Primo did Turf safety of treated greens Figure 4. No visible discoloration, crown rising or delay in green-up that would negatively impact turf quality was ob- served on the greens after applying Proxy mixed with common fungicides used for snow mold protection in winter. Fungicides † only followed by no spring treatment 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 Turf quality in Colorado Figure 5. Turf quality of cool-season putting green turf (a mixture of an- nual bluegrass and creeping bentgrass) treated with fungicides and Proxy mixtures before snow cover in November (pre-) and/or after snow melts in February (post-) in Colorado. Complete treatment details are in Table 1. Within a month, quality means with different letters indicate significant dif - ferences in quality among treatments. Winter applications of ethephon (as Proxy) mixed with fungicides were safe and enhanced turf quality in spring. † Syngenta fungicides ‡ Bayer fungicides not provide acceptable quality, even though some seedheads were suppressed. Applying Proxy mixed with snow mold fungicides be - fore spring programs provided the best turf quality (Figure 6). Applying Proxy at both 8 7 6 5 4 3 2 1 0 November February March May Visual quality (1-9 scale) a a a a a a a a a a a a a a a a a a a a a a a a e d bc ab cd bc ab a

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