A composition comprising herbicidal mixtures of mesotrione impregnated into or coated on the surface of a granular substrate material such as a fertilizer granule andor a solid inert carrier material is provided for use to control weeds in turfgrasses without causing damage to the grass and methods for the use thereof. The first and second stabilizers are present in an amount effective to stabilize the radiopharmaceutical, and the radiopharmaceutical is not a metal complex of the diphosphonic acid. When the cartridge is not in use, the receiving opening and the longitudinal opening are not exposed, while the same are open when the cartridge is in use so that the information is recordedreproduced onfrom the disc accommodated therein.