This takes away leaf area from the rye, which causes the rye to use up food reserves in the roots.  This is known as burning out.  It will also open up the canopy for direct heat absorption, which favors the Bermuda grass by warming up the soil. Again, don’t panic when you see burnt grass. It is just the rye burning itself out.

A light application every 3 weeks of ammonium sulfate fertilizer is recommended. This fertilizer application will weaken the rye grass in addition to reviving the dormant hybrid Bermuda.

This is optional, but highly recommended.  Renting a machine that extracts core samples, in intervals, is the best method.  Poking holes in the soil compacts the soil and does not achieve the desired results.  This process should weaken the rye by drawing more heat to the soil. This encourages the hybrid Bermuda grass
to emerge. 

We recommend that you reduce the amount of watering, but do not shut it off completely!  Reducing the amount of water will help to further stress the rye. Remember that you want to antagonize the rye and enhance conditions for the Bermuda.  Shutting off the water will definitely damage both grasses.

Note:  Shaded areas will notoriously hold on to the rye, sometimes even in the heat of mid-summer.  Often there is poor Bermuda in these areas because of the shade conditions.  Also, low-lying areas that remain wet will hold the rye.  Aerifying and applying gypsum will help with drainage and aid transition.  Also,
take time to get your lawnmower ready by changing the oil, cleaning the filter and sharpening the blade.  Good running equipment is a must!  Following these tips will make the transition from winter grass to summer grass easier and will avoid the unsightly, burned-out appearance.