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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01.18 GOLF COURSE MANAGEMENT 115 Product Active ingredient Manufacturer Application rates product/acre (fluid ounces) product/square meter (milliliters) Primo (1EC) trinexapac-ethyl Syngenta 22 0.16 Plateau (4L) imazapic BASF 4 0.03 Primo + Plateau (1EC + 4L) trinexapac-ethyl + imazapic Syngenta + BASF 22 + 4 0.16 + 0.03 Anuew (27.5WP) prohexadione calcium Nufarm 44 0.32 Cutless (1.3L) flurprimidol SePRO 37 0.27 Legacy (1.5SL) low flurprimidol + trinexapac-ethyl SePRO 18 0.13 Legacy (1.5SL) high flurprimidol + trinexapac-ethyl SePRO 30 0.22 Musketeer (1SL) flurprimidol + trinexapac-ethyl + paclobutrazol SePRO 30 0.22 Roundup (4L) glyphosate Monsanto 3 0.02 Finale (1SC) glufosinate Bayer 1 pint 0.12 Journey + NIS (2.25L + 100SL) imazapic + glyphosate BASF 11 + 0.25% v/v 0.08 + 0.25% v/v Non-treated control Table 1. Treatment list and rate of product used in a plant growth regulator study on bermudagrass roughs. PGR treatments Treatment % phytotoxicity (0%-100%) 1 WAT* 2 WAT 3 WAT 4 WAT Untreated 1.4b 0.6b 0b 0.6c Primo 4.7b 2.2b 1.4b 0c Plateau 5.8b 15.8a 18.1a 2.1bc Primo + Plateau 5.6b 18.3a 23.4a 2.8bc Anuew 0.6b 0.6b 0.6b 0c Cutless 0b 0b 0b 0c Legacy (low) 0b 0b 0.8b 0c Legacy (high) 5.6b 0.6b 0.3b 0.4c Musketeer 0.8b 0b 0b 0c Roundup 5.3b 0b 0b 3.3abc Finale 73.6a 17.2a 0.8b 7.2a Journey + NIS 5.3b 23.9a 25.6a 5.6ab *WAT, weeks after treatment. Table 2. Average percent phytotoxicity of various products over the course of the study exploring various PGR use on golf course roughs. Ratings above 30% were considered unacceptable. Different letters within a column indicate statistical differences. % phytotoxicity of treatments ment application, and rated on a scale of 0% to 100%, where 0% is no phytotoxicity, 100% is complete death of the turfgrass, and 30% is considered the maximum acceptable level. Turf height and seedhead cover data were both collected at the end of the monthly application cycle. Seedhead cover was rated on a scale of 0% to 100%, where 0% is no seedheads and 100% is complete seedhead coverage. Results P ytotoxicity Phytotoxicity findings are listed in Table 2. Relatively rapid phytotoxicity was evident in plots treated with Finale (Figure 1), and in some instances, damage was obvious the day following application. No other treatments caused any phytotoxicity at this point in the study. Phytotoxicity in Finale plots was tran - sient and was greatly reduced one week after application, and was basically unnoticeable by three weeks after application. Compared with other plots, those treated with Finale also exhibited enhanced turf greening after phy - totoxicity subsided. Greening likely results from the nitrogen supplied to the turf by the ammonium (amine) in Finale, which could promote a flush of color and growth after ap - plication.

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