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Subjection of intensively managed creeping bentgrass (Agrostis stolonifera L. var. palustris (Huds.). Farw., (syn. Agrostis palustris Huds.)) to supraoptimal soil temperatures is deleterious to root viability and longevity. The ability to estimate viable root length would enable creeping bentgrass managers to more accurately schedule certain manage- ment practices. The purpose of this rhizotron study was to develop a model, based on an accumulated degree-day (ADD) method, capable of estimating viable root length density of established 'Crenshaw' and 'L93' creeping bentgrass maintained under putting green conditions. Viable root length density observations were made biweekly and soil temperature data collected April through September 1997, and January through August 1998 and 1999. Relative viable root length density (RVRLD) is defined as the measured viable root length density divided by the maximum density attained that spring. In both years, maximum annual viable root length density for all plots was reached, on average, by 138 days from the beginning of the year (18 May). Cultivar and year effects were nonsignificant (P = 0.67 and 0.20, respectively). Degree-day heat units were calculated using an array of base temperatures by integral and arithmetical methods. Although the two accumulative methods proved suitable, the model regressing arithmetical degree-day accumulations against the bentgrass RVRLD provided a better fit to the data set. Use of the 10 o C base temperature in the arithmetical ADD calculations provided the following model; RVRLD = 0.98 - (1.30 × 10

Estimation of Viable Root-length Density of Heat-tolerant `Crenshaw' and `L93' Creeping Bentgrass by an Accumulative Degree-day Model