What does the Specialist Say: Unfortunately, there are no herbicides that will eradicate sandspurs in bahiagrass fields.  The only effective option is to apply glyphosate as a spot-treatment or through a wiper. However, using  a wiper this time of year when bahiagrass is actively seeding will be difficult since sandspur will not likely gain a height advantage over the bahiagrass seedheads.  Unfortunately, all other herbicide options that effectively control sandspur will greatly damage bahiagrass and dramatically reduce yield. Jason Ferrell, Extension Weed Specialist, University of Florida