Biozyme at 1500 and 3000 ppm alone or combined with gibbe­rellic acid (GA3) at 25 ppm were sprayed at full bloom of persimmon Cv. Costata trees. All treatments increased fruit set (%) and yield/tree as compared with the control. The highest fruit set, yield and retained fruits percentage were recorded by the treatment of 3000 ppm Biozyme + 25 ppm GA3 as compared with the control. On the other hand all treatme­nts reduced fruit weight, volum and dimensions as compared with the control. The treatment of GA3 at 25 ppm alone or combined with Bic­zyme at 1500 ppm increased significantly fruit frimness as compared with the control. Fruit chemical characters were not affected by all treat­ments.