Anuew PGR Performance on Bentgrass Fairways

Growing degree day models can successfully predict the performance of gibberellin-inhibiting plant growth regulators (PGRs) applied to cool-season golf putting greens. These models are effective because metabolism or degradation of PGRs was found to be directly related to air temperature. Relative clipping yield of turfgrasses treated with PGRs follow a sinewave model with a period of growth suppression followed by a period of growth enhancement, hereafter called rebound, with respect to non-treated cool-season putting greens. Prior research found growth suppression is magnified on higher mower creeping bentgrass, such as golf course fairways. Recently, a new Class A PGR, late-GA inhibitor, called prohexadione-Ca (PC) became registered for use on turfgrass as Anuew (Nufarm). The performance of this new PGR on creeping bentgrass fairways is relatively unknown.