Golf Course Management

JAN 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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Page 127 of 219

118 GOLF COURSE MANAGEMENT 01.18 Seed ead cover All treated turf had fewer seedheads than the untreated turf (Figure 5). Roundup pro - vided the least seedhead control, indicating again that further experimentation with rates may be justified. Plots treated with Finale or with products containing imazapic had good seedhead control (< 5% seedhead cover); however, this result must be weighed against the visible damage following these products. Primo and the high rate of Legacy provided excellent control of seedheads, and neither product caused unacceptable phytotoxicity damage during the study. Additional interesting observations were noted during the seedhead portion of the study. Seedhead cover was different at dif - ferent dates, with early rating dates having higher cover than later dates. Repeated ap - plications of PGRs likely contributed to this difference. Seedhead control was also evident in plots treated with Finale several weeks after the study concluded compared with the plots around them. This seedhead control could have been caused by the earlier phytotoxic damage, which may have slowed the develop - ment of seedheads. Conclusions The results of this study indicate that using PGRs and lighter rates of herbicides could re - duce mowing in roughs — and, potentially, labor costs. Several treatments may be unsuit - able in certain situations because they cause phytotoxicity. However, damage from phy - totoxicity was usually at relatively low levels or short-lived. All treatments showed an ad - vantage over the untreated plots in terms of seedhead suppression, but the height of turf treated with Roundup and Finale was not significantly reduced when compared with the untreated turf. During the course of the study, visible differences could be seen clearly in some of the plots, as Primo and Finale plots were regularly darker than adjacent plots. Additional research should explore higher rates of certain products such as Roundup, tank-mixing products, or reducing turf phy - Turf height Figure 4. Bermudagrass turf height (inches) of plots treated with various PGR and herbicide products four weeks after initial application. Bars designated with different letters are statistically different. 5 4 3 2 1 0 Turf height (inches) AB E DE E CD CDE BC E CDE A A E

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