Golf Course Management

MAR 2019

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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03.19 GOLF COURSE MANAGEMENT 77 silvery-thread moss, but the necrotic game- tophyte is able to resist decay, and regrowth often occurs directly from the injured shoots in the weeks following the initial application (8). Interestingly, carfentrazone is strictly la - beled for post-emergent control of silvery- thread moss in putting greens, but pre-emer - gent control of silvery-thread moss bulbils and spores plated in carfentrazone-enhanced agar medium has been reported (7). Pre-emergent control of silvery-thread moss propagules would allow superintendents to make an ap - plication before implementing practices that aid in dispersal of bulbils and shoot fragments (for example, brushing, verticutting, groom - ing); however, carfentrazone does not persist in the soil because of rapid microbial degrada - tion (14), so pre-emergent applications in put- ting greens may not provide consistent silvery- thread moss control. Timing often has a dramatic effect on the efficacy of herbicide applications (9, 12). In this study, the split applications of carfentrazone were strategically made one week before and one week after cultivation treatments were ad - ministered. Our intention was that the first of the split applications would injure the silvery- thread moss gametophyte, allowing creeping bentgrass to fill the voids created by the cul - tivation treatments, while the second applica- tion (two weeks later) would control any dis- persed plant material. is research supports previous findings showing that carfentrazone is a valuable tool that can temporarily shift stand dynamics in favor of the desirable turf - grass species; however, it is not likely to eradi- cate silvery-thread moss completely. Topdressing eoretically, topdressing in conjunction with cultivation would shift stand dynam - ics in favor of creeping bentgrass by partially covering silvery-thread moss (1) and thereby reducing its photosynthetic capacity. How - ever, in our study, light, frequent topdressing did not affect silvery-thread moss cover at any rating date throughout the experiment. ese results differ from earlier research (1) that re - ported a 39% reduction in silvery-thread moss cover from four applications of sand topdress - ing. e whole plots receiving frequent top- Figure 3. Change in silvery-thread moss cover from the beginning of the study in fall 2012 until its completion in fall 2014. Red = untreated, black = hollow-tine aerification + carfentrazone, and yellow = hollow-tine aerification only. Percentages indicate the level of silvery-thread moss infestation.

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