Fertilome Yield Booster RTU (32 oz)Fertilome Yield Booster RTU (32 oz) Helps stop 'Blossom End Rot' on Tomatoes, the setting of fruit, and correcting calcium deficiencies. Blossom end rot can be recognized by the dark grey black sunken area on the blossom end (bottom of Tomatoes). Blossom end rot can be small or can cover almost half of the fruit and will decrease Tomato yield. Application Rate: Apply as a thorough cover spray to foliage and fruit. Use at weekly intervals for at least