Control Rye grass in Tifton 85

       I have a 12 acre Tifton 85 patch that has some volunteer Italian Rye grass coming up in it.  I rode thru the patch yesterday checking on my Tifton and it is just starting to green up.  I couldn't say for sure if some of it really went dormant.  I had planned on spraying it with roundup thinking the Tifton was dormant and would not be affected in order to clean it up.  Would any of you know what I could spray it with now to kill the Italian rye grass but not harm my Tifton, or have any suggestions regarding this?  I square bale this patch and sell the hay is the reason I am trying to keep as clean as I can even on a first cut.

 

Thanks,

Jason

Control Rye grass in Tifton 85