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Additional index words. ball roll, gibberellic acid, GA, plant growth regulator,PGR, stimpmeter Abstract. Trinexapac-ethyl (TE) is a plant growth regulator registered for periodic ap- plications on creeping bentgrass greens but ball roll as affected by various TE regimens have not been reported. Field experiments were conducted in Clemson, S.C., from May to July 2003 and 2004 on an 'L-93' creeping bentgrass putting green. Turf received a total of 0.2 kg·ha -1 a.i. of TE over 12 weeks in three application regimens: 0.017 kg·ha -1 per week, 0.033 kg·ha -1 per 2 weeks, and 0.05 kg·ha -1 per 3 weeks plus a control. Ball roll distances were measured weekly with a stimpmeter in the morning (900 to 1100 HR) and evening (>1700 HR). Morning ball roll distances were generally longer than evening. Ball roll dis- tances increased from June to July 2003 and from May to July 2004, likely resulting from greater bentgrass summer heat stress during the test period. Turf treated with biweekly and triweekly TE regimens had enhanced ball roll on three and four dates, respectively, but inconsistencies occurred likely from reduced effi cacy with greater time between repeated applications. Weekly TE applications enhanced ball roll distances from the untreated by 5% to 8% on six dates. Turf injury did not occur following TE applications regardless of regimen. Overall, weekly TE applications increased ball roll distances more frequently than biweekly and triweekly regimens, but enhancements were inconsistent over the 2 years. Chemical name used: (4-(cyclopropyl-(α)-hydroxymethylene)-3,5-dioxo-cyclohexane carboxylic acid ethyl ester) (trinexapac-ethyl); (tetrachloroisophthalonitrile) (chlorothalo- nil); (methyl(E)-2-(2-(6-(2-cyanophenoxy) pyrimidin-4-yloxy)phenyl)-3-methoxyacrylate) (azoxystrobin); (aluminum tris(0-ethyl phosphonate)) (fosetyl-al); (N-(2,6-Dimethylphe- nyl)-N-(methoxyacetyl) alanine methyl ester) (metalaxyl); ((1-((2-(2,4-dichlorophenyl)-4- propyl-1,3-dioxolan-2-yl) -methyl)-14-1,2,4-triazole) (propiconazole). Plant growth regulator (PGR) applica- tions have become an important practice in creeping bentgrass (Agrostis palustris Huds.) putting green management. Inhibiting bentgrass leaf growth fl uctuations with PGRs promotes surface uniformity that further

Trinexapac-ethyl Application Regimens Influence Creeping Bentgrass Putting Green Performance