. 1/2 Oz Roundup per gallon and 40 gallons per Acre will control Sandspurs. 1/2 Oz of Round per gallon Per Thousand on active growing Bermuda will only slow Bermuda growth and it will bounds back in a months time. I Chemically Mow (PGR) my own Bermuda Yard at the 1/2 Oz of Roundup per thousand and only mowed it 6 times a year. At no time did I burn my yard with Roundup and my grass was never over 6 inches tall. 1/2 Oz of Roundup will slow Bermuda growth for about 30 days. .