........................................................................................................................................ ii Acknowledgments......................................................................................................................... v List of Tables ............................................................................................................................. viii List of Figures ............................................................................................................................... x List of Abbreviations ................................................................................................................... xi Literature Review.......................................................................................................................... 1 Annual bluegrass (Poa annua L.) ..................................................................................... 1 Control options for annual bluegrass in turfgrass ............................................................. 3 General herbicide bioavailability in soils ......................................................................... 9 Methiozolin ..................................................................................................................... 12 Dissertation objectives .................................................................................................... 15 Methiozolin Absorption and Translocation in Annual Bluegrass............................................... 17 Introduction ..................................................................................................................... 17 Materials and Methods .................................................................................................... 20 Results and Discussion ................................................................................................... 25 Methiozolin Sorption and Mobility in Sand-Based Root-Zones ................................................ 40 Introduction ..................................................................................................................... 40 Materials and Methods .................................................................................................... 43 Results and Discussion ................................................................................................... 49 Annual Bluegrass (Poa annua) Control with Methiozolin Tank-Mixed with Nutrients ............ 63